From 5fb4e288a025af1abc5c67ecebf30fbf6b3edad1 Mon Sep 17 00:00:00 2001
From: Christopher Oo <t-chriso@microsoft.com>
Date: Thu, 25 Jun 2015 16:10:48 -0700
Subject: [PATCH] cifs: Fix use-after-free on mid_q_entry

With CIFS_DEBUG_2 enabled, additional debug information is tracked inside each
mid_q_entry struct, however cifs_save_when_sent may use the mid_q_entry after it
has been freed from the appropriate callback if the transport layer has very low
latency. Holding the srv_mutex fixes this use-after-free, as cifs_save_when_sent
is called while the srv_mutex is held while the request is sent.

Signed-off-by: Christopher Oo <t-chriso@microsoft.com>
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