Re: [PATCH] af_unix: Revert 'lock_interruptible' in stream receive code

[David Miller <davem@davemloft.net>]

From: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Date: Wed, 16 Dec 2015 20:09:25 +0000

> With b3ca9b02b00704053a38bfe4c31dbbb9c13595d0, the AF_UNIX SOCK_STREAM
> receive code was changed from using mutex_lock(&u->readlock) to
> mutex_lock_interruptible(&u->readlock) to prevent signals from being
> delayed for an indefinite time if a thread sleeping on the mutex
> happened to be selected for handling the signal. But this was never a
> problem with the stream receive code (as opposed to its datagram
> counterpart) as that never went to sleep waiting for new messages with the
> mutex held and thus, wouldn't cause secondary readers to block on the
> mutex waiting for the sleeping primary reader. As the interruptible
> locking makes the code more complicated in exchange for no benefit,
> change it back to using mutex_lock.
> 
> Signed-off-by: Rainer Weikusat <rweikusat@mobileactivedefense.com>

Applied, thanks Rainer.