mmc: sdhci-s3c: fix incorrect spinlock usage after merge

In the commit f522886e202a34a2191dd5d471b3c4d46410a9a0 a merge conflict
in the sdhci-s3c driver been fixed. However the fix used incorrect
spinlock operation - it caused a race with sdhci interrupt service. The
correct way to solve it is to use spin_lock_irqsave/irqrestore() calls.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 71ad4163b95..735d431f09e 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -241,8 +241,10 @@ static struct sdhci_ops sdhci_s3c_ops = {
 static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
 {
         struct sdhci_host *host = platform_get_drvdata(dev);
+        unsigned long flags;
+
         if (host) {
-                spin_lock(&host->lock);
+                spin_lock_irqsave(&host->lock, flags);
                 if (state) {
                         dev_dbg(&dev->dev, "card inserted.\n");
                         host->flags &= ~SDHCI_DEVICE_DEAD;
@@ -253,7 +255,7 @@ static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
                         host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
                 }
                 tasklet_schedule(&host->card_tasklet);
-                spin_unlock(&host->lock);
+                spin_unlock_irqrestore(&host->lock, flags);
         }
 }