linux/drivers/xen
Konrad Rzeszutek Wilk 7736594836 xen/irq: Alter the locking to use a mutex instead of a spinlock.
When we allocate/change the IRQ informations, we do not
need to use spinlocks. We can use a mutex (which is
what the generic IRQ code does for allocations/changes).
Fixes a slew of:

BUG: sleeping function called from invalid context at /linux/kernel/mutex.c:271
in_atomic(): 1, irqs_disabled(): 0, pid: 3216, name: xenstored
2 locks held by xenstored/3216:
 #0:  (&u->bind_mutex){......}, at: [<ffffffffa02e0920>] evtchn_ioctl+0x30/0x3a0 [xen_evtchn]
 #1:  (irq_mapping_update_lock){......}, at: [<ffffffff8138b274>] bind_evtchn_to_irq+0x24/0x90
Pid: 3216, comm: xenstored Not tainted 3.1.0-rc6-00021-g437a3d1 #2
Call Trace:
 [<ffffffff81088d10>] __might_sleep+0x100/0x130
 [<ffffffff81645c2f>] mutex_lock_nested+0x2f/0x50
 [<ffffffff81627529>] __irq_alloc_descs+0x49/0x200
 [<ffffffffa02e0920>] ? evtchn_ioctl+0x30/0x3a0 [xen_evtchn]
 [<ffffffff8138b214>] xen_allocate_irq_dynamic+0x34/0x70
 [<ffffffff8138b2ad>] bind_evtchn_to_irq+0x5d/0x90
 [<ffffffffa02e03c0>] ? evtchn_bind_to_user+0x60/0x60 [xen_evtchn]
 [<ffffffff8138c282>] bind_evtchn_to_irqhandler+0x32/0x80
 [<ffffffffa02e03a9>] evtchn_bind_to_user+0x49/0x60 [xen_evtchn]
 [<ffffffffa02e0a34>] evtchn_ioctl+0x144/0x3a0 [xen_evtchn]
 [<ffffffff811b4070>] ? vfsmount_lock_local_unlock+0x50/0x80
 [<ffffffff811a6a1a>] do_vfs_ioctl+0x9a/0x5e0
 [<ffffffff811b476f>] ? mntput+0x1f/0x30
 [<ffffffff81196259>] ? fput+0x199/0x240
 [<ffffffff811a7001>] sys_ioctl+0xa1/0xb0
 [<ffffffff8164ea82>] system_call_fastpath+0x16/0x1b

Reported-by: Jim Burns <jim_burn@bellsouth.net>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-09-15 04:32:02 -04:00
..
xen-pciback xen/pciback: remove duplicated #include 2011-08-03 14:34:52 -04:00
xenbus xen: Add module alias to autoload backend drivers 2011-06-30 12:15:33 -04:00
xenfs Merge branch 'xen/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 2011-01-20 16:37:28 -08:00
balloon.c xen/balloon: memory hotplug support for Xen balloon driver 2011-07-25 20:57:08 -07:00
biomerge.c xen: define BIOVEC_PHYS_MERGEABLE() 2010-10-18 10:40:28 -04:00
cpu_hotplug.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-12-11 12:18:16 -08:00
events.c xen/irq: Alter the locking to use a mutex instead of a spinlock. 2011-09-15 04:32:02 -04:00
evtchn.c treewide: remove extra semicolons 2011-04-10 17:01:05 +02:00
features.c xen: clean up asm/xen/hypervisor.h 2008-12-16 21:50:31 +01:00
gntalloc.c xen/gntdev,gntalloc: Remove unneeded VM flags 2011-03-09 22:15:28 -05:00
gntdev.c Merge branches 'stable/backend.base.v3' and 'stable/gntalloc.v7' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-05-19 16:14:25 -07:00
grant-table.c xen/grant: Fix compile warning. 2011-08-03 14:34:53 -04:00
Kconfig xen/self-balloon: Add dependency on tmem. 2011-08-03 14:34:57 -04:00
Makefile Merge branch 'stable/xen-pciback-0.6.3' into stable/drivers 2011-07-20 15:33:51 -04:00
manage.c PM: Remove sysdev suspend, resume and shutdown operations 2011-05-11 21:37:15 +02:00
pci.c xen: register xen pci notifier 2010-10-27 18:56:07 +01:00
platform-pci.c xen: no need to delay xen_setup_shutdown_event for hvm guests anymore 2011-02-25 16:43:03 +00:00
swiotlb-xen.c Merge branch 'stable/xen-swiotlb.bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6 2011-06-09 12:52:44 -07:00
sys-hypervisor.c drivers/xen/sys-hypervisor: Cleanup code/data sections definitions 2011-05-19 11:30:41 -04:00
tmem.c xen: prepare tmem shim to handle frontswap 2011-06-17 15:06:20 -06:00
xen-balloon.c xen: tmem: self-ballooning and frontswap-selfshrinking 2011-07-08 12:26:21 -06:00
xen-selfballoon.c xen: xen-selfballoon.c needs more header files 2011-08-10 15:21:46 -04:00
xencomm.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00