bug in AT91 MCI suspend routines

This patch fixes a bug in AT91 mmc host driver, that enables the wakeup
from suspend on card detection pin even if the card detect pin is not
available (==0). If not card detection pin is defined, IRQ0 == FIQ gets
enabled and if some activity is present on that pin, the system gets a
FIQ request, that causes a crash.

Signed-off-by: Anti Sullin <anti.sullin@artecdesign.ee>
Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/at91_mci.c

@@ -941,7 +941,7 @@ static int __exit at91_mci_remove(struct platform_device *pdev)
 
 	host = mmc_priv(mmc);
 
-	if (host->present != -1) {
+	if (host->board->det_pin) {
 		device_init_wakeup(&pdev->dev, 0);
 		free_irq(host->board->det_pin, host);
 		cancel_delayed_work(&host->mmc->detect);
@@ -972,7 +972,7 @@ static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
 	struct at91mci_host *host = mmc_priv(mmc);
 	int ret = 0;
 
-	if (device_may_wakeup(&pdev->dev))
+	if (host->board->det_pin && device_may_wakeup(&pdev->dev))
 		enable_irq_wake(host->board->det_pin);
 
 	if (mmc)
@@ -987,7 +987,7 @@ static int at91_mci_resume(struct platform_device *pdev)
 	struct at91mci_host *host = mmc_priv(mmc);
 	int ret = 0;
 
-	if (device_may_wakeup(&pdev->dev))
+	if (host->board->det_pin && device_may_wakeup(&pdev->dev))
 		disable_irq_wake(host->board->det_pin);
 
 	if (mmc)