From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Date: Tue, 18 Sep 2012 06:42:42 +0000 (+0000)
Subject: mmc: sh-mmcif: avoid oops on spurious interrupts
X-Git-Tag: v3.5.7~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c6924929b212796dcab375c9ac482baef142205;p=thirdparty%2Fkernel%2Fstable.git

mmc: sh-mmcif: avoid oops on spurious interrupts

commit 8464dd52d3198dd05cafb005371d76e5339eb842 upstream.

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>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 724b35e85a265..3b8236bedee51 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -1191,6 +1191,10 @@ 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;