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staging: vt6656: [bug] Fix missing spin lock in iwctl_siwpower. 

Fixes occasional dead lock on power up / down.

spin_lock_irq is used because of unlocking with spin_unlock_irq
elsewhere in the driver.

Only relevant to kernels 3.8 and later when command was
transferred to the iw_handler.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: stable@vger.kernel.org # 3.8+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2013-05-15 01:44:25 +01:00 committed by Greg Kroah-Hartman
parent 2ea86d5ac6
commit 91ec61f8f0
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/vt6656/iwctl.c
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@ -1345,9 +1345,12 @@ int iwctl_siwpower(struct net_device *dev, struct iw_request_info *info,
return rc;
}
spin_lock_irq(&pDevice->lock);
if (wrq->disabled) {
pDevice->ePSMode = WMAC_POWER_CAM;
PSvDisablePowerSaving(pDevice);
spin_unlock_irq(&pDevice->lock);
return rc;
}
if ((wrq->flags & IW_POWER_TYPE) == IW_POWER_TIMEOUT) {
@ -1358,6 +1361,9 @@ int iwctl_siwpower(struct net_device *dev, struct iw_request_info *info,
pDevice->ePSMode = WMAC_POWER_FAST;
PSvEnablePowerSaving((void *)pDevice, pMgmt->wListenInterval);
}
spin_unlock_irq(&pDevice->lock);
switch (wrq->flags & IW_POWER_MODE) {
case IW_POWER_UNICAST_R:
DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO " SIOCSIWPOWER: IW_POWER_UNICAST_R \n");