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Date:	Thu, 05 May 2011 17:25:52 -0700
From:	Greg KH <>
	Chris Ball <>
Subject: [31/43] mmc: sdhci: Check mrq != NULL in sdhci_tasklet_finish

2.6.33-longterm review patch.  If anyone has any objections, please let us know.


From: Chris Ball <>

commit 0c9c99a765321104cc5f9c97f949382a9ba4927e upstream.

It seems that under certain circumstances the sdhci_tasklet_finish()
call can be entered with mrq set to NULL, causing the system to crash
with a NULL pointer de-reference.

Seen on S3C6410 system.  Based on a patch by Dimitris Papastamos.

Reported-by: Dimitris Papastamos <>
Signed-off-by: Chris Ball <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/mmc/host/sdhci.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1266,6 +1266,13 @@ static void sdhci_tasklet_finish(unsigne
 	host = (struct sdhci_host*)param;
+        /*
+         * If this tasklet gets rescheduled while running, it will
+         * be run again afterwards but without any active request.
+         */
+	if (!host->mrq)
+		return;
 	spin_lock_irqsave(&host->lock, flags);

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