linux-kernel - [PATCH 4.4 113/131] staging: vt6655: Fix interrupt race condition on device start up.

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Date:   Mon,  1 Apr 2019 19:03:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Malcolm Priestley <tvboxspy@...il.com>
Subject: [PATCH 4.4 113/131] staging: vt6655: Fix interrupt race condition on device start up.

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Malcolm Priestley <tvboxspy@...il.com>

commit 3b9c2f2e0e99bb67c96abcb659b3465efe3bee1f upstream.

It appears on some slower systems that the driver can find its way
out of the workqueue while the interrupt is disabled by continuous polling
by it.

Move MACvIntEnable to vnt_interrupt_work so that it is always enabled
on all routes out of vnt_interrupt_process.

Move MACvIntDisable so that the device doesn't keep polling the system
while the workqueue is being processed.

Signed-off-by: Malcolm Priestley <tvboxspy@...il.com>
CC: stable@...r.kernel.org # v4.2+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/vt6655/device_main.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -972,8 +972,6 @@ static void vnt_interrupt_process(struct
 		return;
 	}
 
-	MACvIntDisable(priv->PortOffset);
-
 	spin_lock_irqsave(&priv->lock, flags);
 
 	/* Read low level stats */
@@ -1062,8 +1060,6 @@ static void vnt_interrupt_process(struct
 	}
 
 	spin_unlock_irqrestore(&priv->lock, flags);
-
-	MACvIntEnable(priv->PortOffset, IMR_MASK_VALUE);
 }
 
 static void vnt_interrupt_work(struct work_struct *work)
@@ -1073,6 +1069,8 @@ static void vnt_interrupt_work(struct wo
 
 	if (priv->vif)
 		vnt_interrupt_process(priv);
+
+	MACvIntEnable(priv->PortOffset, IMR_MASK_VALUE);
 }
 
 static irqreturn_t vnt_interrupt(int irq,  void *arg)
@@ -1081,6 +1079,8 @@ static irqreturn_t vnt_interrupt(int irq
 
 	schedule_work(&priv->interrupt_work);
 
+	MACvIntDisable(priv->PortOffset);
+
 	return IRQ_HANDLED;
 }