diff options
author | Mark Brown <broonie@linaro.org> | 2013-08-29 18:40:30 +0100 |
---|---|---|
committer | Mark Brown <broonie@linaro.org> | 2013-08-29 18:40:30 +0100 |
commit | 72bce45fdecab65936f1e466c5c5107e48f8251e (patch) | |
tree | e5009748ab6136465c812860b7913d06098ed520 /drivers/xen/events.c | |
parent | 0d0c6fddf052ca1e5324297420ed587a95b7be82 (diff) | |
parent | 965abff8d8accdffc4af1b11fcf580e83031330a (diff) |
Merge branch 'linux-linaro-lsk' into linux-linaro-lsk-androidlsk-android-13.08
Diffstat (limited to 'drivers/xen/events.c')
-rw-r--r-- | drivers/xen/events.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 6a6bbe4ede92..1faa1305c043 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -346,7 +346,7 @@ 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) @@ -1492,8 +1492,10 @@ void rebind_evtchn_irq(int evtchn, int irq) /* Rebind an evtchn so that it gets delivered to a specific cpu */ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) { + struct shared_info *s = HYPERVISOR_shared_info; struct evtchn_bind_vcpu bind_vcpu; int evtchn = evtchn_from_irq(irq); + int masked; if (!VALID_EVTCHN(evtchn)) return -1; @@ -1510,6 +1512,12 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) bind_vcpu.vcpu = tcpu; /* + * Mask the event while changing the VCPU binding to prevent + * it being delivered on an unexpected VCPU. + */ + masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask)); + + /* * If this fails, it usually just indicates that we're dealing with a * virq or IPI channel, which don't actually need to be rebound. Ignore * it, but don't do the xenlinux-level rebind in that case. @@ -1517,6 +1525,9 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) bind_evtchn_to_cpu(evtchn, tcpu); + if (!masked) + unmask_evtchn(evtchn); + return 0; } |