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authorJeremy Fitzhardinge <jeremy@goop.org>2008-08-20 17:02:18 -0700
committerIngo Molnar <mingo@elte.hu>2008-08-21 13:52:57 +0200
commit168d2f464ab9860f0d1e66cf1f9684973222f1c6 (patch)
treec3a4199cf2aa4c6322b7860c431fd5bfdc4220ef /drivers/xen
parent7708ad64a24a674f7905aa7a5099a50f055debec (diff)
downloadop-kernel-dev-168d2f464ab9860f0d1e66cf1f9684973222f1c6.zip
op-kernel-dev-168d2f464ab9860f0d1e66cf1f9684973222f1c6.tar.gz
xen: save previous spinlock when blocking
A spinlock can be interrupted while spinning, so make sure we preserve the previous lock of interest if we're taking a lock from within an interrupt handler. We also need to deal with the case where the blocking path gets interrupted between testing to see if the lock is free and actually blocking. If we get interrupted there and end up in the state where the lock is free but the irq isn't pending, then we'll block indefinitely in the hypervisor. This fix is to make sure that any nested lock-takers will always leave the irq pending if there's any chance the outer lock became free. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index a083703..b6c2b8f 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -164,6 +164,12 @@ static inline void set_evtchn(int port)
sync_set_bit(port, &s->evtchn_pending[0]);
}
+static inline int test_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ return sync_test_bit(port, &s->evtchn_pending[0]);
+}
+
/**
* notify_remote_via_irq - send event to remote end of event channel via irq
@@ -732,6 +738,25 @@ void xen_clear_irq_pending(int irq)
clear_evtchn(evtchn);
}
+void xen_set_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ set_evtchn(evtchn);
+}
+
+bool xen_test_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+ bool ret = false;
+
+ if (VALID_EVTCHN(evtchn))
+ ret = test_evtchn(evtchn);
+
+ return ret;
+}
+
/* Poll waiting for an irq to become pending. In the usual case, the
irq will be disabled so it won't deliver an interrupt. */
void xen_poll_irq(int irq)
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