Thomas Gleixner cc40a2916d genirq: Sanitize spurious interrupt detection of threaded irqs ... commit 1e77d0a1ed upstream. Till reported that the spurious interrupt detection of threaded interrupts is broken in two ways: - note_interrupt() is called for each action thread of a shared interrupt line. That's wrong as we are only interested whether none of the device drivers felt responsible for the interrupt, but by calling multiple times for a single interrupt line we account IRQ_NONE even if one of the drivers felt responsible. - note_interrupt() when called from the thread handler is not serialized. That leaves the members of irq_desc which are used for the spurious detection unprotected. To solve this we need to defer the spurious detection of a threaded interrupt to the next hardware interrupt context where we have implicit serialization. If note_interrupt is called with action_ret == IRQ_WAKE_THREAD, we check whether the previous interrupt requested a deferred check. If not, we request a deferred check for the next hardware interrupt and return. If set, we check whether one of the interrupt threads signaled success. Depending on this information we feed the result into the spurious detector. If one primary handler of a shared interrupt returns IRQ_HANDLED we disable the deferred check of irq threads on the same line, as we have found at least one device driver who cared. Reported-by: Till Straumann <strauman@slac.stanford.edu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Austin Schuh <austin@peloton-tech.com> Cc: Oliver Hartkopp <socketcan@hartkopp.net> Cc: Wolfgang Grandegger <wg@grandegger.com> Cc: Pavel Pisa <pisa@cmp.felk.cvut.cz> Cc: Marc Kleine-Budde <mkl@pengutronix.de> Cc: linux-can@vger.kernel.org Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1303071450130.22263@ionos Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-06-30 20:12:00 -07:00
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acpi
asm-generic	mm: use paravirt friendly ops for NUMA hinting ptes	2014-05-31 13:20:30 -07:00
clocksource
crypto
drm	Merge tag 'ttm-fixes-3.14-2014-02-18' of git://people.freedesktop.org/~thomash/linux into drm-fixes	2014-02-19 08:21:26 +10:00
dt-bindings	dt: tegra: remove non-existent clock IDs	2014-05-06 07:59:38 -07:00
keys
kvm	ARM: KVM: fix non-VGIC compilation	2014-03-06 09:47:42 +01:00
linux	genirq: Sanitize spurious interrupt detection of threaded irqs	2014-06-30 20:12:00 -07:00
math-emu
media
memory
misc
net	net: fix inet_getid() and ipv6_select_ident() bugs	2014-06-26 15:15:39 -04:00
pcmcia
ras
rdma	IB/core: Don't resolve passive side RoCE L2 address in CMA REQ handler	2014-05-06 07:59:28 -07:00
rxrpc
scsi	scsi: fix our current target reap infrastructure	2014-05-31 13:20:27 -07:00
sound	ALSA: control: Protect user controls against concurrent access	2014-06-26 15:15:43 -04:00
target	target: Report correct response length for some commands	2014-06-30 20:12:00 -07:00
trace	trace: module: Maintain a valid user count	2014-06-07 10:28:20 -07:00
uapi	ALSA: compress: Cancel the optimization of compiler and fix the size of struct for all platform.	2014-06-26 15:15:42 -04:00
video
xen	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2014-02-14 10:45:18 -08:00
Kbuild