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gru: handle failures to mmu_notifier_register

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Under some conditions, mmu_notifier_register() will fail to register a
mmu_notifier.  Fix the GRU driver to correctly handle these failures.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jack Steiner
2009-12-15 16:48:08 -08:00
committed by Linus Torvalds
parent 6c9620c64b
commit 7f2251b1bc
3 changed files with 21 additions and 11 deletions
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8
drivers/misc/sgi-gru/grutlbpurge.c
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@@ -299,6 +299,7 @@ struct gru_mm_struct *gru_register_mmu_notifier(void)
{
struct gru_mm_struct *gms;
struct mmu_notifier *mn;
int err;
mn = mmu_find_ops(current->mm, &gru_mmuops);
if (mn) {
@@ -311,12 +312,17 @@ struct gru_mm_struct *gru_register_mmu_notifier(void)
gms->ms_notifier.ops = &gru_mmuops;
atomic_set(&gms->ms_refcnt, 1);
init_waitqueue_head(&gms->ms_wait_queue);
__mmu_notifier_register(&gms->ms_notifier, current->mm);
err = __mmu_notifier_register(&gms->ms_notifier, current->mm);
if (err)
goto error;
}
}
gru_dbg(grudev, "gms %p, refcnt %d\n", gms,
atomic_read(&gms->ms_refcnt));
return gms;
error:
kfree(gms);
return ERR_PTR(err);
}
void gru_drop_mmu_notifier(struct gru_mm_struct *gms)