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authorDavid Vrabel <david.vrabel@citrix.com>2013-08-15 16:21:06 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-08-20 18:13:02 +0400
commit84ca7a8e45dafb49cd5ca90a343ba033e2885c17 (patch)
tree78e6c4f1baed53a9e431125e486cd036a4490a91 /drivers/xen
parent3bc38cbceb85881a8eb789ee1aa56678038b1909 (diff)
downloadlinux-84ca7a8e45dafb49cd5ca90a343ba033e2885c17.tar.xz
xen/events: initialize local per-cpu mask for all possible events
The sizeof() argument in init_evtchn_cpu_bindings() is incorrect resulting in only the first 64 (or 32 in 32-bit guests) ports having their bindings being initialized to VCPU 0. In most cases this does not cause a problem as request_irq() will set the irq affinity which will set the correct local per-cpu mask. However, if the request_irq() is called on a VCPU other than 0, there is a window between the unmasking of the event and the affinity being set were an event may be lost because it is not locally unmasked on any VCPU. If request_irq() is called on VCPU 0 then local irqs are disabled during the window and the race does not occur. Fix this by initializing all NR_EVENT_CHANNEL bits in the local per-cpu masks. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> CC: stable@vger.kernel.org
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index a58ac435a9a4..a1ad5dae8ee1 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -348,7 +348,7 @@ static void init_evtchn_cpu_bindings(void)
for_each_possible_cpu(i)
memset(per_cpu(cpu_evtchn_mask, i),
- (i == 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask, i)));
+ (i == 0) ? ~0 : 0, NR_EVENT_CHANNELS/8);
}
static inline void clear_evtchn(int port)