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wireless: b43: fix Oops on card eject during transfer 

An Oops has once been observed, when the SDIO card had been ejected during
IO. The PC value shows, that the dev pointer in b43_op_stop() was NULL.

(I moved the NULL check before the lock, based upon a suggestion from
Julian Calaby <julian.calaby@gmail.com>. -- JWL)

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Guennadi Liakhovetski 2012-01-06 12:58:16 +01:00 committed by John W. Linville
parent 099469502f
commit ccde8a45cb
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wireless/b43/main.c
View File

@ -4852,6 +4852,9 @@ static void b43_op_stop(struct ieee80211_hw *hw)
cancel_work_sync(&(wl->beacon_update_trigger));
if (!dev)
goto out;
mutex_lock(&wl->mutex);
if (b43_status(dev) >= B43_STAT_STARTED) {
dev = b43_wireless_core_stop(dev);
@ -4863,7 +4866,7 @@ static void b43_op_stop(struct ieee80211_hw *hw)
out_unlock:
mutex_unlock(&wl->mutex);
out:
cancel_work_sync(&(wl->txpower_adjust_work));
}