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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-09-18 06:42:42 +0000
committerChris Ball <cjb@laptop.org>2012-10-03 10:05:28 -0400
commit8464dd52d3198dd05cafb005371d76e5339eb842 (patch)
tree71faa28ff4aea73dcb473a120ed4eecfd7368998 /drivers/mmc
parent7a7eb3286b8e078d6f5de56a2e26a3bb248085eb (diff)
downloadlinux-8464dd52d3198dd05cafb005371d76e5339eb842.tar.bz2
mmc: sh-mmcif: avoid oops on spurious interrupts
On some systems, e.g., kzm9g, MMCIF interfaces can produce spurious interrupts without any active request. To prevent the Oops, that results in such cases, don't dereference the mmc request pointer until we make sure, that we are indeed processing such a request. Reported-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sh_mmcif.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 6df3dc3164f7..11d2bc3b51d5 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -1231,6 +1231,10 @@ static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
host->sd_error = true;
dev_dbg(&host->pd->dev, "int err state = %08x\n", state);
}
+ if (host->state == STATE_IDLE) {
+ dev_info(&host->pd->dev, "Spurious IRQ status 0x%x", state);
+ return IRQ_HANDLED;
+ }
if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
if (!host->dma_active)
return IRQ_WAKE_THREAD;