[3.5.y.z,extended,stable] Patch "mmc: sh-mmcif: avoid oops on spurious interrupts" has been added to staging queue

Message ID 1355172201-23235-1-git-send-email-herton.krzesinski@canonical.com
State New
Headers show

Commit Message

Herton Ronaldo Krzesinski Dec. 10, 2012, 8:43 p.m.
This is a note to let you know that I have just added a patch titled

    mmc: sh-mmcif: avoid oops on spurious interrupts

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 316d1704cf51f7606f1cbd5cc786114ac9859a88 Mon Sep 17 00:00:00 2001
From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Date: Wed, 22 Aug 2012 06:49:47 +0000
Subject: [PATCH 02/11] mmc: sh-mmcif: avoid oops on spurious interrupts
 (second try)

commit 91ab252ac5a5c3461dd6910797611e9172626aed 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>
Tested-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
 drivers/mmc/host/sh_mmcif.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)



diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 724b35e..a5786a8 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -1066,7 +1066,6 @@  static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
 	struct sh_mmcif_host *host = dev_id;
 	struct mmc_request *mrq = host->mrq;
-	struct mmc_data *data = mrq->data;


@@ -1114,13 +1113,14 @@  static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
 		if (host->sd_error)
-			data->error = sh_mmcif_error_manage(host);
+			mrq->data->error = sh_mmcif_error_manage(host);

 	if (host->wait_for != MMCIF_WAIT_FOR_STOP) {
+		struct mmc_data *data = mrq->data;
 		if (!mrq->cmd->error && data && !data->error)
 			data->bytes_xfered =
 				data->blocks * data->blksz;