==> On Fri, 29 Dec 2006 17:34:26 -0800, "Chen, Kenneth W" <[email protected]> said:
Kenneth> An AIO bug was reported that sleeping function is being called in softirq
Kenneth> context:
Kenneth> The real problem is that the condition check of ctx->reqs_active in
Kenneth> wait_for_all_aios() is incorrect that access to reqs_active is not
Kenneth> being properly protected by spin lock.
Kenneth> This patch adds that protective spin lock, and at the same time removes
Kenneth> all duplicate ref counting for each kiocb as reqs_active is already used
Kenneth> as a ref count for each active ioctx. This also ensures that buggy call
Kenneth> to flush_workqueue() in softirq context is eliminated.
I was finally able to wrap my head around this, and testing has
confirmed that this patch fixes the problem. So,
Acked-by: Jeff Moyer <[email protected]>
Better late than never.
-Jeff
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