linux-kernel - [PATCH] Staging: Correct tsi-148 VME interrupt free routine

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Date:	Wed, 05 Aug 2009 17:33:44 +0100
From:	Martyn Welch <martyn.welch@...anuc.com>
To:	gregkh@...e.de
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	jirislaby@...il.com
Subject: [PATCH] Staging: Correct tsi-148 VME interrupt free routine

As identified by Jiri, the VME interrupt free routine removes the service
routine before disabling the interrupt. Re-order operations to be performed in
the reverse of the request routine.
---

Jiri: Thanks for the feedback.

Martyn

 drivers/staging/vme/bridges/vme_tsi148.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/vme/bridges/vme_tsi148.c b/drivers/staging/vme/bridges/vme_tsi148.c
index ad6fc2d..cdc2919 100644
--- a/drivers/staging/vme/bridges/vme_tsi148.c
+++ b/drivers/staging/vme/bridges/vme_tsi148.c
@@ -484,21 +484,22 @@ void tsi148_free_irq(int level, int statid)
 	/* Get semaphore */
 	down(&(vme_irq));
 
-	tsi148_bridge->irq[level - 1].callback[statid].func = NULL;
-	tsi148_bridge->irq[level - 1].callback[statid].priv_data = NULL;
 	tsi148_bridge->irq[level - 1].count--;
 
-	/* Disable IRQ level */
+	/* Disable IRQ level if no more interrupts attached at this level*/
 	if (tsi148_bridge->irq[level - 1].count == 0) {
-		tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEO);
-		tmp &= ~TSI148_LCSR_INTEO_IRQEO[level - 1];
-		iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEO);
-
 		tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEN);
 		tmp &= ~TSI148_LCSR_INTEN_IRQEN[level - 1];
 		iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEN);
+
+		tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEO);
+		tmp &= ~TSI148_LCSR_INTEO_IRQEO[level - 1];
+		iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEO);
 	}
 
+	tsi148_bridge->irq[level - 1].callback[statid].func = NULL;
+	tsi148_bridge->irq[level - 1].callback[statid].priv_data = NULL;
+
 	/* Release semaphore */
 	up(&(vme_irq));
 }
--
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