From: Amitkumar Karwar <akarwar@marvell.com>
Date: Sat, 12 Jul 2014 03:53:14 +0000 (-0700)
Subject: mwifiex: fix corner case system hang issue
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~149^2~73^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5343f06902bf6635734d1e72aa2100dd63a6f4b;p=pandora-kernel.git

mwifiex: fix corner case system hang issue

Sometimes pending internal scan commands are delayed to give
preference to Tx traffic. 'scan_processing' flag has been
checked at the beginning of delay timer routine to know if in the
meantime scan operation has been cancelled.

There is a corner case where pending scan commands are emptied
after scan_processing flag check is passed. In this case
wrong pointer returned by list_first_entry() is passed to
list_del() which causes system hang.

This patch fixes the issue by adding list_empty() check.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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