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Red Hat Bugzilla – Attachment 156301 Details for
Bug 242422
BUG: at kernel/softirq.c:639 __tasklet_action()
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tasklet-fix.patch
tasklet-fix.patch (text/plain), 906 bytes, created by
IBM Bug Proxy
on 2007-06-06 01:50:31 UTC
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Description:
tasklet-fix.patch
Filename:
MIME Type:
Creator:
IBM Bug Proxy
Created:
2007-06-06 01:50:31 UTC
Size:
906 bytes
patch
obsolete
>Index: 2.6-rt/kernel/softirq.c >=================================================================== >--- 2.6-rt.orig/kernel/softirq.c 2007-06-05 18:30:54.000000000 -0700 >+++ 2.6-rt/kernel/softirq.c 2007-06-05 18:36:44.000000000 -0700 >@@ -544,10 +544,17 @@ static void inline > __tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr) > { > if (tasklet_trylock(t)) { >- WARN_ON(t->next != NULL); >- t->next = head->list; >- head->list = t; >- raise_softirq_irqoff(nr); >+ /* We may have been preempted before tasklet_trylock >+ * and __tasklet_action may have already run. >+ * So double check the sched bit while the takslet >+ * is locked before adding it to the list. >+ */ >+ if (test_bit(TASKLET_STATE_SCHED, &t->state)) { >+ WARN_ON(t->next != NULL); >+ t->next = head->list; >+ head->list = t; >+ raise_softirq_irqoff(nr); >+ } > tasklet_unlock(t); > } > }
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