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staging: vt6655: device_intr check for vif on while loop 

vif should never be or go null while in loop.

Fixes race condition where interrupts are late and when
interface is not present.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2015-04-06 21:19:48 +01:00 committed by Greg Kroah-Hartman
parent aeda3b2d4a
commit 32b249b0f5
1 changed files with 8 additions and 13 deletions
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21
drivers/staging/vt6655/device_main.c
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@ -1090,7 +1090,7 @@ static irqreturn_t device_intr(int irq, void *dev_instance)
* update ISR counter
*/
STAvUpdate802_11Counter(&pDevice->s802_11Counter, &pDevice->scStatistic, dwMIBCounter);
while (pDevice->dwIsr != 0) {
while (pDevice->dwIsr && pDevice->vif) {
STAvUpdateIsrStatCounter(&pDevice->scStatistic, pDevice->dwIsr);
MACvWriteISR(pDevice->PortOffset, pDevice->dwIsr);
@ -1102,8 +1102,7 @@ static irqreturn_t device_intr(int irq, void *dev_instance)
}
if (pDevice->dwIsr & ISR_TBTT) {
if (pDevice->vif &&
pDevice->op_mode != NL80211_IFTYPE_ADHOC)
if (pDevice->op_mode != NL80211_IFTYPE_ADHOC)
vnt_check_bb_vga(pDevice);
pDevice->bBeaconSent = false;
@ -1143,19 +1142,15 @@ static irqreturn_t device_intr(int irq, void *dev_instance)
max_count += device_tx_srv(pDevice, TYPE_AC0DMA);
if (pDevice->dwIsr & ISR_SOFTTIMER1) {
if (pDevice->vif) {
if (pDevice->vif->bss_conf.enable_beacon)
vnt_beacon_make(pDevice, pDevice->vif);
}
if (pDevice->vif->bss_conf.enable_beacon)
vnt_beacon_make(pDevice, pDevice->vif);
}
/* If both buffers available wake the queue */
if (pDevice->vif) {
if (AVAIL_TD(pDevice, TYPE_TXDMA0) &&
AVAIL_TD(pDevice, TYPE_AC0DMA) &&
ieee80211_queue_stopped(pDevice->hw, 0))
ieee80211_wake_queues(pDevice->hw);
}
if (AVAIL_TD(pDevice, TYPE_TXDMA0) &&
AVAIL_TD(pDevice, TYPE_AC0DMA) &&
ieee80211_queue_stopped(pDevice->hw, 0))
ieee80211_wake_queues(pDevice->hw);
MACvReadISR(pDevice->PortOffset, &pDevice->dwIsr);