2.6.35-longterm review patch. If anyone has any objections, please let me know.
------------------
From: Chris Ball <c...@laptop.org>
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 <d...@opensource.wolfsonmicro.com>
Signed-off-by: Chris Ball <c...@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
drivers/mmc/host/sdhci.c | 7 +++++++
1 file changed, 7 insertions(+)
Index: linux-2.6.35.y/drivers/mmc/host/sdhci.c
===================================================================
--- linux-2.6.35.y.orig/drivers/mmc/host/sdhci.c
+++ linux-2.6.35.y/drivers/mmc/host/sdhci.c
@@ -1278,6 +1278,13 @@ 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);
del_timer(&host->timer);
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