These wrappers have no more users; remove them.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
pagecache_write_begin() and pagecache_write_end() are now trivial
wrappers, so call the aops directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
pagecache_write_begin() and pagecache_write_end() are now trivial
wrappers, so call the aops directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
pagecache_write_begin() and pagecache_write_end() are now trivial
wrappers, so call the aops directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There is only one kind of write_begin/write_end aops, so we don't need
to look up which aop it is, just make hfsplus_write_begin() available to
this file and call it directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There is only one kind of write_begin/write_end aops, so we don't need
to look up which aop it is, just make hfs_write_begin() available to
this file and call it directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
After the last patch, Smatch reports:
fs/ntfs3/file.c:168 ntfs_extend_initialized_size()
error: uninitialized symbol 'fsdata'.
fsdata is indeed unused. This is not new, but Smatch couldn't see it
before because calls through pagecache_write_begin()/pagecache_write_end()
could theoretically call any implemention of ->write_begin/write_end,
some of which do use fsdata. Now that the calls are direct, Smatch can
see they're never used.
Fix this by simply passing NULL. While ntfs3 does pass this parameter
on to generic functions, those generic functions also never dereference
the fsdata parameter, so it's unnecessary to pass the address of a real
pointer.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
There is only one kind of write_begin/write_end aops, so we don't need to
look up which aop it is, just make ntfs_write_begin() and ntfs_write_end()
available to this file and call them directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
pagecache_write_begin() and pagecache_write_end() are now trivial
wrappers, so call the aops directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
pagecache_write_begin() and pagecache_write_end() are now trivial
wrappers, so call the aops directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
With all users of this flag gone, we can stop testing whether it's set.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Instead of setting AOP_FLAG_NOFS, use memalloc_nofs_save() and
memalloc_nofs_restore() to prevent GFP_FS allocations recursing
into the filesystem with a journal already started.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Instead of setting AOP_FLAG_NOFS, use memalloc_nofs_save() and
memalloc_nofs_restore() to prevent GFP_FS allocations recursing
into the filesystem with a journal already started.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Replace use of AOP_FLAG_NOFS with calls to memalloc_nofs_save()
and memalloc_nofs_restore().
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Since commit 8bc1379b82, the transaction is stopped before calling
ext4_da_convert_inline_data_to_extent(), which means we can do GFP_FS
allocations and recurse into the filesystem.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Prevent GFP_FS allocations by using memalloc_nofs_save() instead
of AOP_FLAG_NOFS.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Stop using AOP_FLAG_NOFS in favour of the scoped memory API.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no callers of __page_symlink() left, so we can remove that
entry point.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
By using the memalloc_nofs_save() functionality, we can call
page_symlink(), safe in the knowledge that it won't recurse into the
filesystem.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Convert scsicam to use a folio instead of a page. There is no need to
check the error flag here; read_cache_folio() will return -EIO if the
folio cannot be read correctly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
It became slightly larger as I've been off in the last weeks.
The majority of changes at this PR is about ASoC, the fixes for
dmaengine and for for addressing issues reported by CI, as well as
other device-specific small fixes. Also, the fixes for FireWire
core stack and the usual HD-audio quirks are included.
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Merge tag 'sound-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"This became slightly larger as I've been off in the last weeks.
The majority of changes here is about ASoC, fixes for dmaengine
and for addressing issues reported by CI, as well as other
device-specific small fixes.
Also, fixes for FireWire core stack and the usual HD-audio quirks
are included"
* tag 'sound-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (23 commits)
ASoC: SOF: Fix NULL pointer exception in sof_pci_probe callback
ASoC: ops: Validate input values in snd_soc_put_volsw_range()
ASoC: dmaengine: Restore NULL prepare_slave_config() callback
ASoC: atmel: mchp-pdmc: set prepare_slave_config
ASoC: max98090: Generate notifications on changes for custom control
ASoC: max98090: Reject invalid values in custom control put()
ALSA: fireworks: fix wrong return count shorter than expected by 4 bytes
ALSA: hda/realtek: Add quirk for Yoga Duet 7 13ITL6 speakers
firewire: core: extend card->lock in fw_core_handle_bus_reset
firewire: remove check of list iterator against head past the loop body
firewire: fix potential uaf in outbound_phy_packet_callback()
ASoC: rt9120: Correct the reg 0x09 size to one byte
ALSA: hda/realtek: Enable mute/micmute LEDs support for HP Laptops
ALSA: hda/realtek: Fix mute led issue on thinkpad with cs35l41 s-codec
ASoC: meson: axg-card: Fix nonatomic links
ASoC: meson: axg-tdm-interface: Fix formatters in trigger"
ASoC: soc-ops: fix error handling
ASoC: meson: Fix event generation for G12A tohdmi mux
ASoC: meson: Fix event generation for AUI CODEC mux
ASoC: meson: Fix event generation for AUI ACODEC mux
...
The last two users were floppy.c and ataflop.c respectively, it was
verified that no other drivers makes use of this, so let's remove it.
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: Minh Yuan <yuanmingbuaa@gmail.com>
Cc: Denis Efremov <efremov@linux.com>,
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is the last driver making use of fd_request->error_count, which is
easy to get wrong as was shown in floppy.c. We don't need to keep it
there, it can be moved to the atari_floppy_struct instead, so let's do
this.
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: Minh Yuan <yuanmingbuaa@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Interrupt handler bad_flp_intr() may cause a UAF on the recently freed
request just to increment the error count. There's no point keeping
that one in the request anyway, and since the interrupt handler uses a
static pointer to the error which cannot be kept in sync with the
pending request, better make it use a static error counter that's reset
for each new request. This reset now happens when entering
redo_fd_request() for a new request via set_next_request().
One initial concern about a single error counter was that errors on one
floppy drive could be reported on another one, but this problem is not
real given that the driver uses a single drive at a time, as that
PC-compatible controllers also have this limitation by using shared
signals. As such the error count is always for the "current" drive.
Reported-by: Minh Yuan <yuanmingbuaa@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Tested-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
A larger collection of fixes than I'd like, mainly because mixer-test
is making it's way into the CI systems and turning up issues on a wider
range of systems. The most substantial thing though is a revert and an
alternative fix for a dmaengine issue where the fix caused disruption
for some other configurations, the core fix is backed out an a driver
specific thing done instead.
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Merge tag 'asoc-fix-v5.18-rc4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Fixes for v5.18
A larger collection of fixes than I'd like, mainly because mixer-test
is making it's way into the CI systems and turning up issues on a wider
range of systems. The most substantial thing though is a revert and an
alternative fix for a dmaengine issue where the fix caused disruption
for some other configurations, the core fix is backed out an a driver
specific thing done instead.
- fix the bounds check for the 'gpio-reserved-ranges' device property in
gpiolib-of
- drop the assignment of the pwm base number in gpio-mvebu (this was missed
by the patch doing it globally for all pwm drivers)
- fix the fwnode assignment (use own fwnode, not the parent's one) for the
GPIO irqchip in gpio-visconti
- update the irq_stat field before checking the trigger field in gpio-pca953x
- update GPIO entry in MAINTAINERS
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Merge tag 'gpio-fixes-for-v5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- fix the bounds check for the 'gpio-reserved-ranges' device property
in gpiolib-of
- drop the assignment of the pwm base number in gpio-mvebu (this was
missed by the patch doing it globally for all pwm drivers)
- fix the fwnode assignment (use own fwnode, not the parent's one) for
the GPIO irqchip in gpio-visconti
- update the irq_stat field before checking the trigger field in
gpio-pca953x
- update GPIO entry in MAINTAINERS
* tag 'gpio-fixes-for-v5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: pca953x: fix irq_stat not updated when irq is disabled (irq_mask not set)
gpio: visconti: Fix fwnode of GPIO IRQ
MAINTAINERS: update the GPIO git tree entry
gpio: mvebu: drop pwm base assignment
gpiolib: of: fix bounds check for 'gpio-reserved-ranges'
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Merge tag 'block-5.18-2022-05-06' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"A single revert for a change that isn't needed in 5.18, and a small
series for s390/dasd"
* tag 'block-5.18-2022-05-06' of git://git.kernel.dk/linux-block:
s390/dasd: Use kzalloc instead of kmalloc/memset
s390/dasd: Fix read inconsistency for ESE DASD devices
s390/dasd: Fix read for ESE with blksize < 4k
s390/dasd: prevent double format of tracks for ESE devices
s390/dasd: fix data corruption for ESE devices
Revert "block: release rq qos structures for queue without disk"
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Merge tag 'io_uring-5.18-2022-05-06' of git://git.kernel.dk/linux-block
Pull io_uring fix from Jens Axboe:
"Just a single file assignment fix this week"
* tag 'io_uring-5.18-2022-05-06' of git://git.kernel.dk/linux-block:
io_uring: assign non-fixed early for async work
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Merge tag 'for-5.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"Regression fixes in zone activation:
- move a loop invariant out of the loop to avoid checking space
status
- properly handle unlimited activation
Other fixes:
- for subpage, force the free space v2 mount to avoid a warning and
make it easy to switch a filesystem on different page size systems
- export sysfs status of exclusive operation 'balance paused', so the
user space tools can recognize it and allow adding a device with
paused balance
- fix assertion failure when logging directory key range item"
* tag 'for-5.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: sysfs: export the balance paused state of exclusive operation
btrfs: fix assertion failure when logging directory key range item
btrfs: zoned: activate block group properly on unlimited active zone device
btrfs: zoned: move non-changing condition check out of the loop
btrfs: force v2 space cache usage for subpage mount
Highlights include:
Stable fixes:
- Fix a socket leak when setting up an AF_LOCAL RPC client
- Ensure that knfsd connects to the gss-proxy daemon on setup
Bugfixes:
- Fix a refcount leak when migrating a task off an offlined transport
- Don't gratuitously invalidate inode attributes on delegation return
- Don't leak sockets in xs_local_connect()
- Ensure timely close of disconnected AF_LOCAL sockets
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Merge tag 'nfs-for-5.18-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client fixes from Trond Myklebust:
"Highlights include:
Stable fixes:
- Fix a socket leak when setting up an AF_LOCAL RPC client
- Ensure that knfsd connects to the gss-proxy daemon on setup
Bugfixes:
- Fix a refcount leak when migrating a task off an offlined transport
- Don't gratuitously invalidate inode attributes on delegation return
- Don't leak sockets in xs_local_connect()
- Ensure timely close of disconnected AF_LOCAL sockets"
* tag 'nfs-for-5.18-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
Revert "SUNRPC: attempt AF_LOCAL connect on setup"
SUNRPC: Ensure gss-proxy connects on setup
SUNRPC: Ensure timely close of disconnected AF_LOCAL sockets
SUNRPC: Don't leak sockets in xs_local_connect()
NFSv4: Don't invalidate inode attributes on delegation return
SUNRPC release the transport of a relocated task with an assigned transport
* Account for family 17h event renumberings in AMD PMU emulation
* Remove CPUID leaf 0xA on AMD processors
* Fix lockdep issue with locking all vCPUs
* Fix loss of A/D bits in SPTEs
* Fix syzkaller issue with invalid guest state
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"x86:
- Account for family 17h event renumberings in AMD PMU emulation
- Remove CPUID leaf 0xA on AMD processors
- Fix lockdep issue with locking all vCPUs
- Fix loss of A/D bits in SPTEs
- Fix syzkaller issue with invalid guest state"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: VMX: Exit to userspace if vCPU has injected exception and invalid state
KVM: SEV: Mark nested locking of vcpu->lock
kvm: x86/cpuid: Only provide CPUID leaf 0xA if host has architectural PMU
KVM: x86/svm: Account for family 17h event renumberings in amd_pmc_perf_hw_id
KVM: x86/mmu: Use atomic XCHG to write TDP MMU SPTEs with volatile bits
KVM: x86/mmu: Move shadow-present check out of spte_has_volatile_bits()
KVM: x86/mmu: Don't treat fully writable SPTEs as volatile (modulo A/D)
* A fix to relocate the DTB early in boot, in cases where the bootloader
doesn't put the DTB in a region that will end up mapped by the kernel.
This manifests as a crash early in boot on a handful of
configurations.
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Merge tag 'riscv-for-linus-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fix from Palmer Dabbelt:
- A fix to relocate the DTB early in boot, in cases where the
bootloader doesn't put the DTB in a region that will end up
mapped by the kernel.
This manifests as a crash early in boot on a handful of
configurations.
* tag 'riscv-for-linus-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
RISC-V: relocate DTB if it's outside memory region
Exit to userspace with an emulation error if KVM encounters an injected
exception with invalid guest state, in addition to the existing check of
bailing if there's a pending exception (KVM doesn't support emulating
exceptions except when emulating real mode via vm86).
In theory, KVM should never get to such a situation as KVM is supposed to
exit to userspace before injecting an exception with invalid guest state.
But in practice, userspace can intervene and manually inject an exception
and/or stuff registers to force invalid guest state while a previously
injected exception is awaiting reinjection.
Fixes: fc4fad79fc ("KVM: VMX: Reject KVM_RUN if emulation is required with pending exception")
Reported-by: syzbot+cfafed3bb76d3e37581b@syzkaller.appspotmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220502221850.131873-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
svm_vm_migrate_from() uses sev_lock_vcpus_for_migration() to lock all
source and target vcpu->locks. Unfortunately there is an 8 subclass
limit, so a new subclass cannot be used for each vCPU. Instead maintain
ownership of the first vcpu's mutex.dep_map using a role specific
subclass: source vs target. Release the other vcpu's mutex.dep_maps.
Fixes: b56639318b ("KVM: SEV: Add support for SEV intra host migration")
Reported-by: John Sperbeck<jsperbeck@google.com>
Suggested-by: David Rientjes <rientjes@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Gonda <pgonda@google.com>
Message-Id: <20220502165807.529624-1-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
A few recent regressions in rxe's multicast code, and some old driver
bugs:
- Error case unwind bug in rxe for rkeys
- Dot not call netdev functions under a spinlock in rxe multicast code
- Use the proper BH lock type in rxe multicast code
- Fix idrma deadlock and crash
- Add a missing flush to drain irdma QPs when in error
- Fix high userspace latency in irdma during destroy due to
synchronize_rcu()
- Rare race in siw MPA processing
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma fixes from Jason Gunthorpe:
"A few recent regressions in rxe's multicast code, and some old driver
bugs:
- Error case unwind bug in rxe for rkeys
- Dot not call netdev functions under a spinlock in rxe multicast
code
- Use the proper BH lock type in rxe multicast code
- Fix idrma deadlock and crash
- Add a missing flush to drain irdma QPs when in error
- Fix high userspace latency in irdma during destroy due to
synchronize_rcu()
- Rare race in siw MPA processing"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
RDMA/rxe: Change mcg_lock to a _bh lock
RDMA/rxe: Do not call dev_mc_add/del() under a spinlock
RDMA/siw: Fix a condition race issue in MPA request processing
RDMA/irdma: Fix possible crash due to NULL netdev in notifier
RDMA/irdma: Reduce iWARP QP destroy time
RDMA/irdma: Flush iWARP QP if modified to ERR from RTR state
RDMA/rxe: Recheck the MR in when generating a READ reply
RDMA/irdma: Fix deadlock in irdma_cleanup_cm_core()
RDMA/rxe: Fix "Replace mr by rkey in responder resources"
fbdev:
- hotunplugging fix
amdgpu:
- Fix a xen dom0 regression on APUs
- Fix a potential array overflow if a receiver were to
send an erroneous audio channel count
msm:
- lockdep fix.
it6505:
- kconfig fix
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Merge tag 'drm-fixes-2022-05-06' of git://anongit.freedesktop.org/drm/drm
Pull drm fixes from Dave Airlie:
"A pretty quiet week, one fbdev, msm, kconfig, and two amdgpu fixes,
about what I'd expect for rc6.
fbdev:
- hotunplugging fix
amdgpu:
- Fix a xen dom0 regression on APUs
- Fix a potential array overflow if a receiver were to send an
erroneous audio channel count
msm:
- lockdep fix.
it6505:
- kconfig fix"
* tag 'drm-fixes-2022-05-06' of git://anongit.freedesktop.org/drm/drm:
drm/amd/display: Avoid reading audio pattern past AUDIO_CHANNELS_COUNT
drm/amdgpu: do not use passthrough mode in Xen dom0
drm/bridge: ite-it6505: add missing Kconfig option select
fbdev: Make fb_release() return -ENODEV if fbdev was unregistered
drm/msm/dp: remove fail safe mode related code
When one port's input state get inverted (eg. from low to hight) after
pca953x_irq_setup but before setting irq_mask (by some other driver such as
"gpio-keys"), the next inversion of this port (eg. from hight to low) will not
be triggered any more (because irq_stat is not updated at the first time). Issue
should be fixed after this commit.
Fixes: 89ea8bbe9c ("gpio: pca953x.c: add interrupt handling capability")
Signed-off-by: Puyou Lu <puyou.lu@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Use kzalloc rather than duplicating its implementation, which
makes code simple and easy to understand.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20220505141733.1989450-6-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Read requests that return with NRF error are partially completed in
dasd_eckd_ese_read(). The function keeps track of the amount of
processed bytes and the driver will eventually return this information
back to the block layer for further processing via __dasd_cleanup_cqr()
when the request is in the final stage of processing (from the driver's
perspective).
For this, blk_update_request() is used which requires the number of
bytes to complete the request. As per documentation the nr_bytes
parameter is described as follows:
"number of bytes to complete for @req".
This was mistakenly interpreted as "number of bytes _left_ for @req"
leading to new requests with incorrect data length. The consequence are
inconsistent and completely wrong read requests as data from random
memory areas are read back.
Fix this by correctly specifying the amount of bytes that should be used
to complete the request.
Fixes: 5e6bdd37c5 ("s390/dasd: fix data corruption for thin provisioned devices")
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20220505141733.1989450-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
When reading unformatted tracks on ESE devices, the corresponding memory
areas are simply set to zero for each segment. This is done incorrectly
for blocksizes < 4096.
There are two problems. First, the increment of dst is done using the
counter of the loop (off), which is increased by blksize every
iteration. This leads to a much bigger increment for dst as actually
intended. Second, the increment of dst is done before the memory area
is set to 0, skipping a significant amount of bytes of memory.
This leads to illegal overwriting of memory and ultimately to a kernel
panic.
This is not a problem with 4k blocksize because
blk_queue_max_segment_size is set to PAGE_SIZE, always resulting in a
single iteration for the inner segment loop (bv.bv_len == blksize). The
incorrectly used 'off' value to increment dst is 0 and the correct
memory area is used.
In order to fix this for blksize < 4k, increment dst correctly using the
blksize and only do it at the end of the loop.
Fixes: 5e2b17e712 ("s390/dasd: Add dynamic formatting support for ESE volumes")
Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20220505141733.1989450-4-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
For ESE devices we get an error for write operations on an unformatted
track. Afterwards the track will be formatted and the IO operation
restarted.
When using alias devices a track might be accessed by multiple requests
simultaneously and there is a race window that a track gets formatted
twice resulting in data loss.
Prevent this by remembering the amount of formatted tracks when starting
a request and comparing this number before actually formatting a track
on the fly. If the number has changed there is a chance that the current
track was finally formatted in between. As a result do not format the
track and restart the current IO to check.
The number of formatted tracks does not match the overall number of
formatted tracks on the device and it might wrap around but this is no
problem. It is only needed to recognize that a track has been formatted at
all in between.
Fixes: 5e2b17e712 ("s390/dasd: Add dynamic formatting support for ESE volumes")
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220505141733.1989450-3-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
For ESE devices we get an error when accessing an unformatted track.
The handling of this error will return zero data for read requests and
format the track on demand before writing to it. To do this the code needs
to distinguish between read and write requests. This is done with data from
the blocklayer request. A pointer to the blocklayer request is stored in
the CQR.
If there is an error on the device an ERP request is built to do error
recovery. While the ERP request is mostly a copy of the original CQR the
pointer to the blocklayer request is not copied to not accidentally pass
it back to the blocklayer without cleanup.
This leads to the error that during ESE handling after an ERP request was
built it is not possible to determine the IO direction. This leads to the
formatting of a track for read requests which might in turn lead to data
corruption.
Fixes: 5e2b17e712 ("s390/dasd: Add dynamic formatting support for ESE volumes")
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220505141733.1989450-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
