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wireless: b43: fix Oops on card eject during transfer

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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
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@ -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));
}