The driver may sleep under a spin lock, and the function call path is:
b43legacy_attr_interfmode_store (acquire the lock by spin_lock_irqsave)
b43legacy_radio_set_interference_mitigation
b43legacy_radio_interference_mitigation_disable
b43legacy_calc_nrssi_slope
b43legacy_synth_pu_workaround
might_sleep and msleep --> may sleep
Fixing it may be complex, and a possible way is to remove
spin_lock_irqsave and spin_lock_irqrestore in
b43legacy_attr_interfmode_store, and the code has been protected by
mutex_lock and mutex_unlock.
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
---
drivers/net/wireless/broadcom/b43legacy/sysfs.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/net/wireless/broadcom/b43legacy/sysfs.c b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
index 2a1da15..9ede143 100644
--- a/drivers/net/wireless/broadcom/b43legacy/sysfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
@@ -137,14 +137,12 @@ static ssize_t b43legacy_attr_interfmode_store(struct device *dev,
}
mutex_lock(&wldev->wl->mutex);
- spin_lock_irqsave(&wldev->wl->irq_lock, flags);
err = b43legacy_radio_set_interference_mitigation(wldev, mode);
if (err)
b43legacyerr(wldev->wl, "Interference Mitigation not "
"supported by device\n");
mmiowb();
- spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
mutex_unlock(&wldev->wl->mutex);
return err ? err : count;
--
1.7.9.5
