Imre Deak 1a2d35126f wait: fix false timeouts when using wait_event_timeout() ... commit 4c663cfc52 upstream. Many callers of the wait_event_timeout() and wait_event_interruptible_timeout() expect that the return value will be positive if the specified condition becomes true before the timeout elapses. However, at the moment this isn't guaranteed. If the wake-up handler is delayed enough, the time remaining until timeout will be calculated as 0 - and passed back as a return value - even if the condition became true before the timeout has passed. Fix this by returning at least 1 if the condition becomes true. This semantic is in line with what wait_for_condition_timeout() does; see commit bb10ed09 ("sched: fix wait_for_completion_timeout() spurious failure under heavy load"). Daniel said "We have 3 instances of this bug in drm/i915. One case even where we switch between the interruptible and not interruptible wait_event_timeout variants, foolishly presuming they have the same semantics. I very much like this." One such bug is reported at https://bugs.freedesktop.org/show_bug.cgi?id=64133 Signed-off-by: Imre Deak <imre.deak@intel.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Jens Axboe <axboe@kernel.dk> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Dave Jones <davej@redhat.com> Cc: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-07-19 11:04:30 +08:00
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acpi	ACPI: Store SRAT table revision	2012-01-25 17:24:57 -08:00
asm-generic	Merge remote-tracking branch 'stable/linux-3.0.y' into develop-3.0	2013-01-15 12:45:19 +08:00
crypto
drm	drm/radeon/kms: add new BTC PCI ids	2012-06-10 00:33:04 +09:00
keys	Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop"	2011-07-30 16:09:59 +08:00
linux	wait: fix false timeouts when using wait_event_timeout()	2013-07-19 11:04:30 +08:00
math-emu	Revert "Merge remote branch 'linux-2.6.32.y/master' into develop"	2011-07-30 16:24:52 +08:00
media	camera(v0.4.1): cif:v0.4.1 generic_sensor:v0.1.0 rk_camera:v0.1.0	2013-04-10 16:27:20 +08:00
mtd
net	Merge remote-tracking branch 'stable/linux-3.0.y' into develop-3.0	2013-01-21 17:21:19 +08:00
pcmcia
rdma
rxrpc
scsi	Revert "Merge commit 'v2.6.32.9' into android-2.6.32"	2011-07-30 22:24:29 +08:00
sound	Merge remote-tracking branch 'stable/linux-3.0.y' into develop-3.0	2012-12-01 12:07:55 +08:00
target	target: Set additional sense length field in sense data	2012-01-25 17:25:00 -08:00
trace	sync: add tracepoint support	2013-02-22 17:47:18 +08:00
video	OMAPDSS: HDMI: PHY burnout fix	2012-03-12 10:32:59 -07:00
xen	xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX.	2012-01-25 17:24:41 -08:00
Kbuild