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aio: be defensive to ensure request batching is non-zero instead of BUG_ON()
author
Benjamin LaHaise
<bcrl@kvack.org>
Wed, 31 Jul 2013 14:34:18 +0000
(10:34 -0400)
committer
Benjamin LaHaise
<bcrl@kvack.org>
Wed, 31 Jul 2013 14:34:18 +0000
(10:34 -0400)
In the event that an overflow/underflow occurs while calculating req_batch,
clamp the minimum at 1 request instead of doing a BUG_ON().
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
fs/aio.c
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diff --git
a/fs/aio.c
b/fs/aio.c
index 52f200ebef072d02cb04ce89207a707deba4b321..588aff9dc3160204c82061ccf59333c3c32bde19 100644
(file)
--- a/
fs/aio.c
+++ b/
fs/aio.c
@@
-576,7
+576,8
@@
static struct kioctx *ioctx_alloc(unsigned nr_events)
atomic_set(&ctx->reqs_available, ctx->nr_events - 1);
ctx->req_batch = (ctx->nr_events - 1) / (num_possible_cpus() * 4);
- BUG_ON(!ctx->req_batch);
+ if (ctx->req_batch < 1)
+ ctx->req_batch = 1;
err = ioctx_add_table(ctx, mm);
if (err)
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