Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=80fda03fc8b5cd09c3e0e90725ef9bcb2a5c7b30 Commit: 80fda03fc8b5cd09c3e0e90725ef9bcb2a5c7b30 Parent: ce2d90591fe69ba19076c5d187dfc88ba3318623 Author: Michael Buesch <[EMAIL PROTECTED]> AuthorDate: Sun Oct 28 17:27:10 2007 +0100 Committer: Jeff Garzik <[EMAIL PROTECTED]> CommitDate: Sat Nov 10 04:25:12 2007 -0500
b43: Fix rfkill callback deadlock wl->mutex might already be locked on initialization. Signed-off-by: Michael Buesch <[EMAIL PROTECTED]> Signed-off-by: John W. Linville <[EMAIL PROTECTED]> --- drivers/net/wireless/b43/rfkill.c | 14 ++++++++++---- 1 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/b43/rfkill.c b/drivers/net/wireless/b43/rfkill.c index 800e0a6..456930f 100644 --- a/drivers/net/wireless/b43/rfkill.c +++ b/drivers/net/wireless/b43/rfkill.c @@ -61,15 +61,22 @@ static void b43_rfkill_poll(struct input_polled_dev *poll_dev) mutex_unlock(&wl->mutex); } -/* Called when the RFKILL toggled in software. - * This is called without locking. */ +/* Called when the RFKILL toggled in software. */ static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state) { struct b43_wldev *dev = data; struct b43_wl *wl = dev->wl; int err = 0; - mutex_lock(&wl->mutex); + /* When RFKILL is registered, it will call back into this callback. + * wl->mutex will already be locked when this happens. + * So first trylock. On contention check if we are in initialization. + * Silently return if that happens to avoid a deadlock. */ + if (mutex_trylock(&wl->mutex) == 0) { + if (b43_status(dev) < B43_STAT_INITIALIZED) + return 0; + mutex_lock(&wl->mutex); + } if (b43_status(dev) < B43_STAT_INITIALIZED) goto out_unlock; @@ -89,7 +96,6 @@ static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state) b43_radio_turn_off(dev, 0); break; } - out_unlock: mutex_unlock(&wl->mutex); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html