From: Rasesh Mody <rmody@brocade.com>
Date: Fri, 16 Sep 2011 15:06:48 +0000 (+0000)
Subject: bna: Eliminate Small Race Condition Window in RX Path
X-Git-Tag: v3.2-rc1~129^2~256
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9fa1fbf98178c8bbda23ff1d3ed0731bb3c0bd1;p=pandora-kernel.git

bna: Eliminate Small Race Condition Window in RX Path

Change details:
 - In a continuous sequence of ifconfig up/down operations, there is a small
   window of race between bnad_set_rx_mode() and bnad_cleanup_rx() while the
   former tries to access rx_info->rx & the latter sets it to NULL. This race
   could lead to bna_rx_mode_set() being called with a NULL (rx_info->rx)
   pointer and a crash.
 - Hold bnad->bna_lock while setting / unsetting rx_info->rx in bnad_setup_rx()
   & bnad_cleanup_rx(), thereby eliminating the race described above.

Signed-off-by: Gurunatha Karaje <gkaraje@brocade.com>
Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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