[PATCH 03/13] staging: vt6656: lock changes: RXvMngWorkItem.

[Malcolm Priestley <tvboxspy@xxxxxxxxx>]

Narrow atomic locks in RXvMngWorkItem.

We must lock the DequeueRCB and RXvFreeRCB so that
they are in sync.

vMgrRxManagePacket can nolonger be atomically called.

There is no need for an overall lock.

Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
---
 drivers/staging/vt6656/dpc.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/vt6656/dpc.c b/drivers/staging/vt6656/dpc.c
index 4ccaa7e..156399d 100644
--- a/drivers/staging/vt6656/dpc.c
+++ b/drivers/staging/vt6656/dpc.c
@@ -1363,34 +1363,43 @@ void RXvMngWorkItem(struct work_struct *work)
 	struct vnt_rcb *pRCB = NULL;
 	struct vnt_rx_mgmt *pRxPacket;
 	int bReAllocSkb = false;
+	unsigned long flags;
 
 	if (pDevice->Flags & fMP_DISCONNECTED)
 		return;
 
     DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"---->Rx Mng Thread\n");
 
-    spin_lock_irq(&pDevice->lock);
     while (pDevice->NumRecvMngList!=0)
     {
+	spin_lock_irqsave(&pDevice->lock, flags);
+
         pRCB = pDevice->FirstRecvMngList;
         pDevice->NumRecvMngList--;
         DequeueRCB(pDevice->FirstRecvMngList, pDevice->LastRecvMngList);
+
+	spin_unlock_irqrestore(&pDevice->lock, flags);
+
         if(!pRCB){
             break;
         }
         pRxPacket = &(pRCB->sMngPacket);
 	vMgrRxManagePacket(pDevice, &pDevice->vnt_mgmt, pRxPacket);
         pRCB->Ref--;
-        if(pRCB->Ref == 0) {
-            DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"RxvFreeMng %d %d\n",pDevice->NumRecvFreeList, pDevice->NumRecvMngList);
-            RXvFreeRCB(pRCB, bReAllocSkb);
-        } else {
+	if (pRCB->Ref == 0) {
+		DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"RxvFreeMng %d %d\n",
+			pDevice->NumRecvFreeList, pDevice->NumRecvMngList);
+
+		spin_lock_irqsave(&pDevice->lock, flags);
+
+		RXvFreeRCB(pRCB, bReAllocSkb);
+
+		spin_unlock_irqrestore(&pDevice->lock, flags);
+	} else {
             DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Rx Mng Only we have the right to free RCB\n");
         }
     }
 
 	pDevice->bIsRxMngWorkItemQueued = false;
-	spin_unlock_irq(&pDevice->lock);
-
 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html