aio: be defensive to ensure request batching is non-zero instead of B…

…UG_ON() 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 <[email protected]>
kyagi · Jul 31, 2013 · 6878ea7 · 6878ea7
1 parent db446a0
commit 6878ea7
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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)