From 656ee76911722261b4d173e8c53c19f5e717c3f5 Mon Sep 17 00:00:00 2001 From: Malcolm Priestley Date: Mon, 6 Apr 2015 21:19:48 +0100 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/staging/vt6655/device_main.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c index 4bb4f8ee41321..5b3de43bde99d 100644 --- a/drivers/staging/vt6655/device_main.c +++ b/drivers/staging/vt6655/device_main.c @@ -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); -- 2.39.5