tree 7562913799f3ec165d2e0befb43e7e5463dac7c2
parent 3fb9852f98ffb4cdd3bad6eb50b1a6d58cee1298
author Rasesh Mody <rmody@brocade.com> 1316185608 +0000
committer David S. Miller <davem@davemloft.net> 1316234877 -0400

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>