Start propagating errors to user space when setting the break state
fails.
This will be used by follow-on changes to also report when a driver or
device does not support break control.
Tested-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
clang with W=1 reports
drivers/usb/serial/quatech2.c:179:19: error: unused function
'qt2_setdevice' [-Werror,-Wunused-function]
static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
^
This function is not used, so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230321181255.1825963-1-trix@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There should be no reason to adjust old ktermios which is going to get
discarded anyway.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220816115739.10928-8-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Having a generic UART_LCR_WLEN() macro and the tty_get_char_size()
helper, we can remove all those repeated switch-cases in drivers.
Cc: Johan Hovold <johan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220224095558.30929-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here are the USB-serial updates for 5.14-rc1, including:
- gpio support for CP2108
- chars_in_buffer and write_room return-value updates
- chars_in_buffer and write_room clean ups
Included are also various clean ups.
All have been in linux-next with no reported issues.
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Merge tag 'usb-serial-5.14-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next
Johan writes:
USB-serial updates for 5.14-rc1
Here are the USB-serial updates for 5.14-rc1, including:
- gpio support for CP2108
- chars_in_buffer and write_room return-value updates
- chars_in_buffer and write_room clean ups
Included are also various clean ups.
All have been in linux-next with no reported issues.
* tag 'usb-serial-5.14-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
USB: serial: cp210x: add support for GPIOs on CP2108
USB: serial: drop irq-flags initialisations
USB: serial: mos7840: drop buffer-callback return-value comments
USB: serial: mos7720: drop buffer-callback sanity checks
USB: serial: io_edgeport: drop buffer-callback sanity checks
USB: serial: digi_acceleport: add chars_in_buffer locking
USB: serial: digi_acceleport: reduce chars_in_buffer over-reporting
USB: serial: make usb_serial_driver::chars_in_buffer return uint
USB: serial: make usb_serial_driver::write_room return uint
The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.
Fix the three requests which erroneously used usb_rcvctrlpipe().
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Cc: stable@vger.kernel.org # 3.5
Signed-off-by: Johan Hovold <johan@kernel.org>
There's no need to initialise irq-flags variables before saving the
interrupt state.
Drop the redundant initialisations from the three drivers that got this
wrong.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Line disciplines expect a positive value or zero returned from
tty->ops->write_room (invoked by tty_write_room). Both of them are being
updated to return an unsigned int. Switch also
usb_serial_driver::write_room and all its users.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
[ johan: amend commit message, drop unrelated comment change ]
Signed-off-by: Johan Hovold <johan@kernel.org>
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.
The closing_wait parameter determines how long to wait for the transfer
buffers to drain during close and the default timeout of 30 seconds may
not be sufficient at low line speeds. In other cases, when for example
flow is stopped, the default timeout may instead be too long.
Add generic support for TIOCSSERIAL and TIOCGSERIAL with handling of the
three common parameters close_delay, closing_wait and line for the
benefit of all USB serial drivers while still allowing drivers to
implement further functionality through the existing callbacks.
This currently includes a few drivers that report their base baud clock
rate even if that is really only of interest when setting custom
divisors through the deprecated ASYNC_SPD_CUST interface; an interface
which only the FTDI driver actually implements.
Some drivers have also been reporting back a fake UART type, something
which should no longer be needed and will be dropped by a follow-on
patch.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.
The xmit_fifo_size parameter could be used to set the hardware transmit
fifo size of a legacy UART when it could not be detected, but the
interface is limited to eight bits and should be left unset when not
used.
Similarly, baud_base could be used to set the UART base clock when it
could not be detected but might as well be left unset when it is not
known.
The close_delay and closing_wait parameters returned by TIOCGSERIAL are
specified in centiseconds (not jiffies). The driver does not yet support
changing these, but let's report back the default values actually used
(0.5 and 30 seconds, respectively).
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
All usb_serial drivers return 0 in their remove callbacks and driver
core ignores the value returned by usb_serial_device_remove(). So change
the remove callback to return void and return 0 unconditionally in
usb_serial_device_remove().
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210208143149.963644-2-uwe@kleine-koenig.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Drop two unused stub functions which only served as documentation.
This also avoids a W=1 (-Wunused-but-set-variable) warning.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Check for NULL port data in the modem- and line-status handlers to avoid
dereferencing a NULL pointer in the unlikely case where a port device
isn't bound to a driver (e.g. after an allocation failure on port
probe).
Note that the other (stubbed) event handlers qt2_process_xmit_empty()
and qt2_process_flush() would need similar sanity checks in case they
are ever implemented.
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Cc: stable <stable@vger.kernel.org> # 3.5
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Fixes gcc '-Wunused-but-set-variable' warning:
drivers/usb/serial/quatech2.c: In function 'qt2_process_read_urb':
drivers/usb/serial/quatech2.c:503:27: warning:
variable 'port_priv' set but not used [-Wunused-but-set-variable]
It not used any more after commit 2be818a116 ('Revert "USB: quatech2:
only write to the tty if the port is open."')
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
The USB completion callback does not disable interrupts while acquiring
the lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave() variant of the locking primitives.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Negative error code will be larger than sizeof().
Note that none of these bugs prevent errors from being detected, even if
the ir-usb one would cause a less precise debug message to printed.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
[ johan: add comment about implications ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Several GPL-2.0 drivers used "GPL" rather than "GPL v2" in their
MODULE_LICENSE macros; fix the macros to match the licenses.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner. So the extra GPL text wording
can be removed as it is no longer needed at all.
This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text. And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.
No copyright headers or other non-license-description text was removed.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.
Update the drivers/usb/ and include/linux/usb* files with the correct
SPDX license identifier based on the license text in the file itself.
The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.
This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Drop redundant calls to tty_buffer_request_room and use the more
efficient tty_insert_flip_char when inserting single characters.
Signed-off-by: Johan Hovold <johan@kernel.org>
Allow subdrivers to modify the port-endpoint mapping by passing the
endpoint descriptors to calc_num_ports.
The callback can now also be used to verify that the required endpoints
exists and abort probing otherwise.
This will allow us to get rid of a few hacks in subdrivers that are
already modifying the port-endpoint mapping (or aborting probe due to
missing endpoints), but only after the port structures have been setup.
Signed-off-by: Johan Hovold <johan@kernel.org>
Do not report ASYNC_SKIP_TEST or ASYNC_AUTO_IRQ as being set in
TIOCGSERIAL handlers as these flags are not supported and do not really
make any sense for USB serial devices in the first place.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Make sure to detect short control-message transfers when fetching
modem and line state in open and when retrieving registers.
This specifically makes sure that an errno is returned to user space on
errors in TIOCMGET instead of a zero bitmask.
Also drop the unused getdevice function which also lacked appropriate
error handling.
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
The write URB was being killed using the synchronous interface while
holding a spin lock in close().
Simply drop the lock and busy-flag update, something which would have
been taken care of by the completion handler if the URB was in flight.
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Drop invalid user-pointer checks from ioctl handlers.
A NULL-pointer can be valid in user space and copy_to_user() takes care
of sanity checking.
Signed-off-by: Johan Hovold <johan@kernel.org>
The interface read URB is submitted in attach, but was only unlinked by
the driver at disconnect.
In case of a late probe error (e.g. due to failed minor allocation),
disconnect is never called and we would end up with active URBs for an
unbound interface. This in turn could lead to deallocated memory being
dereferenced in the completion callback.
Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Cc: stable <stable@vger.kernel.org> # v3.5: 40d0473849
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bool initializations should use true and false. Bool tests don't need
comparisons.
Also, use IS_ENABLED instead of ifdef.
Generated by: scripts/coccinelle/misc/boolinit.cocci
Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Add missing newlines to dev_<level> messages.
Also make some messages less verbose where appropriate.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
None of these files are actually using any __init type directives
and hence don't need to include <linux/init.h>. Most are just a
left over from __devinit and __cpuinit removal, or simply due to
code getting copied from one driver to the next.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove redundant error messages on allocation failures, which have
already been logged.
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Make sure serial DMA-buffers are allocated separately from containing
structure to prevent potential memory corruption on non-cache-coherent
systems.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Make sure serial DMA-buffers are allocated separately from containing
structure to prevent potential memory corruption on non-cache-coherent
systems.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This moves the allocation of minor device numbers from a static array to
be dynamic, using the idr interface. This means that you could
potentially get "gaps" in a minor number range for a single USB serial
device with multiple ports, but all should still work properly.
We remove the 'minor' field from the usb_serial structure, as it no
longer makes any sense for it (use the field in the usb_serial_port
structure if you really want to know this number), and take the fact
that we were overloading a number in this field to determine if we had
initialized the minor numbers or not, and just use a flag variable
instead.
Note, we still have the limitation of 255 USB to serial devices in the
system, as that is all we are registering with the TTY layer at this
point in time.
Tested-by: Tobias Winter <tobias@linuxdingsda.de>
Reviewed-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The usb_serial_port structure had the number field, which was the minor
number for the port, which almost no one really cared about. They
really wanted the number of the port within the device, which you had to
subtract from the minor of the parent usb_serial_device structure. To
clean this up, provide the real minor number of the port, and the number
of the port within the serial device separately, as these numbers might
not be related in the future.
Bonus is that this cleans up a lot of logic in the drivers, and saves
lines overall.
Tested-by: Tobias Winter <tobias@linuxdingsda.de>
Reviewed-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--
drivers/staging/serqt_usb2/serqt_usb2.c | 21 +++--------
drivers/usb/serial/ark3116.c | 2 -
drivers/usb/serial/bus.c | 6 +--
drivers/usb/serial/console.c | 2 -
drivers/usb/serial/cp210x.c | 2 -
drivers/usb/serial/cypress_m8.c | 4 +-
drivers/usb/serial/digi_acceleport.c | 6 ---
drivers/usb/serial/f81232.c | 5 +-
drivers/usb/serial/garmin_gps.c | 6 +--
drivers/usb/serial/io_edgeport.c | 58 ++++++++++++--------------------
drivers/usb/serial/io_ti.c | 21 ++++-------
drivers/usb/serial/keyspan.c | 29 +++++++---------
drivers/usb/serial/metro-usb.c | 4 +-
drivers/usb/serial/mos7720.c | 37 +++++++++-----------
drivers/usb/serial/mos7840.c | 52 +++++++++-------------------
drivers/usb/serial/opticon.c | 2 -
drivers/usb/serial/pl2303.c | 2 -
drivers/usb/serial/quatech2.c | 7 +--
drivers/usb/serial/sierra.c | 2 -
drivers/usb/serial/ti_usb_3410_5052.c | 10 ++---
drivers/usb/serial/usb-serial.c | 7 ++-
drivers/usb/serial/usb_wwan.c | 2 -
drivers/usb/serial/whiteheat.c | 20 +++++------
include/linux/usb/serial.h | 6 ++-
24 files changed, 133 insertions(+), 180 deletions(-)
'qt2_process_read_urb' is referenced only in this file. Make it static.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here's the big USB pull request for 3.10-rc1.
Lots of USB patches here, the majority being USB gadget changes and
USB-serial driver cleanups, the rest being ARM build fixes / cleanups,
and individual driver updates. We also finally got some chipidea fixes,
which have been delayed for a number of kernel releases, as the
maintainer has now reappeared.
All of these have been in linux-next for a while.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB patches from Greg Kroah-Hartman:
"Here's the big USB pull request for 3.10-rc1.
Lots of USB patches here, the majority being USB gadget changes and
USB-serial driver cleanups, the rest being ARM build fixes / cleanups,
and individual driver updates. We also finally got some chipidea
fixes, which have been delayed for a number of kernel releases, as the
maintainer has now reappeared.
All of these have been in linux-next for a while"
* tag 'usb-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (568 commits)
USB: ehci-msm: USB_MSM_OTG needs USB_PHY
USB: OHCI: avoid conflicting platform drivers
USB: OMAP: ISP1301 needs USB_PHY
USB: lpc32xx: ISP1301 needs USB_PHY
USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
usb: phy: tegra: don't call into tegra-ehci directly
usb: phy: phy core cannot yet be a module
USB: Fix initconst in ehci driver
usb-storage: CY7C68300A chips do not support Cypress ATACB
USB: serial: option: Added support Olivetti Olicard 145
USB: ftdi_sio: correct ST Micro Connect Lite PIDs
ARM: mxs_defconfig: add CONFIG_USB_PHY
ARM: imx_v6_v7_defconfig: add CONFIG_USB_PHY
usb: phy: remove exported function from __init section
usb: gadget: zero: put function instances on unbind
usb: gadget: f_sourcesink.c: correct a copy-paste misnomer
usb: gadget: cdc2: fix error return code in cdc_do_config()
usb: gadget: multi: fix error return code in rndis_do_config()
usb: gadget: f_obex: fix error return code in obex_bind()
USB: storage: convert to use module_usb_driver()
...
Always try to disable the uart on close.
Since the switch to tty ports, close will be called as part of shutdown
before disconnect returns. Hence there is no need to check the
disconnected flag, and we can put devices in disabled states also on
driver unbind.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Switch to the generic TIOCMIWAIT implementation.
This also fixes the issue with processes waiting for
modem-status-changes not being woken up at disconnect.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Switch to the generic get_icount implementation.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This reverts commit 27b351c554. It caused
problems with the build.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Bill Pemberton <wfp5p@viridian.itc.virginia.edu>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use the port wait queue and make sure to check the serial disconnected
flag before accessing private port data after waking up.
This is is needed as the private port data (including the wait queue
itself) can be gone when waking up after a disconnect.
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This reverts commit 27b351c554.
Calling tty_flip_buffer_push on an unopened tty is legal, so the
driver doesn't need track if port has been opened. Reverting this
allows the entire is_open logic to be removed.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tty->ops->break_ctl cannot be called outside the gap between open and
close. So there is no need to check whether the port is open in
break_ctl in quatech2. Remove the check and also that member
completely.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The commit 2e124b4a39 removed the checks
that prevented qt2_process_read_urb() from trying to put chars into
ttys that weren't actually opened. This resulted in 'tty is NULL'
warnings from flush_to_ldisc() when the device was used.
The devices use just one read urb for all ports. As a result
qt2_process_read_urb() may be called with the current port set to a
port number that has not been opened. Add a check if the port is open
before calling tty_flip_buffer_push().
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here's the big tty/serial driver patches for 3.9-rc1.
More tty port rework and fixes from Jiri here, as well as lots of
individual serial driver updates and fixes.
All of these have been in the linux-next tree for a while.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial patches from Greg Kroah-Hartman:
"Here's the big tty/serial driver patches for 3.9-rc1.
More tty port rework and fixes from Jiri here, as well as lots of
individual serial driver updates and fixes.
All of these have been in the linux-next tree for a while."
* tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (140 commits)
tty: mxser: improve error handling in mxser_probe() and mxser_module_init()
serial: imx: fix uninitialized variable warning
serial: tegra: assume CONFIG_OF
TTY: do not update atime/mtime on read/write
lguest: select CONFIG_TTY to build properly.
ARM defconfigs: add missing inclusions of linux/platform_device.h
fb/exynos: include platform_device.h
ARM: sa1100/assabet: include platform_device.h directly
serial: imx: Fix recursive locking bug
pps: Fix build breakage from decoupling pps from tty
tty: Remove ancient hardpps()
pps: Additional cleanups in uart_handle_dcd_change
pps: Move timestamp read into PPS code proper
pps: Don't crash the machine when exiting will do
pps: Fix a use-after free bug when unregistering a source.
pps: Use pps_lookup_dev to reduce ldisc coupling
pps: Add pps_lookup_dev() function
tty: serial: uartlite: Support uartlite on big and little endian systems
tty: serial: uartlite: Fix sparse and checkpatch warnings
serial/arc-uart: Miscll DT related updates (Grant's review comments)
...
Fix up trivial conflicts, mostly just due to the TTY config option
clashing with the EXPERIMENTAL removal.
Make sure serial-driver dtr_rts is called with disc_mutex held after
checking the disconnected flag.
Due to a bug in the tty layer, dtr_rts may get called after a device has
been disconnected and the tty-device unregistered. Some drivers have had
individual checks for disconnect to make sure the disconnected interface
was not accessed, but this should really be handled in usb-serial core
(at least until the long-standing tty-bug has been fixed).
Note that the problem has been made more acute with commit 0998d06310
("device-core: Ensure drvdata = NULL when no driver is bound") as the
port data is now also NULL when dtr_rts is called resulting in further
oopses.
Reported-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
