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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-08-22 06:49:47 +0000
committerChris Ball <cjb@laptop.org>2012-12-06 13:54:35 -0500
commit91ab252ac5a5c3461dd6910797611e9172626aed (patch)
tree8e1dfa1c86e2221997e4918203615782404a663c
parent6984f3c31bb57cb7491dbec1be44b74bd00f4648 (diff)
downloadop-kernel-dev-91ab252ac5a5c3461dd6910797611e9172626aed.zip
op-kernel-dev-91ab252ac5a5c3461dd6910797611e9172626aed.tar.gz
mmc: sh-mmcif: avoid oops on spurious interrupts (second try)
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> Cc: stable@vger.kernel.org Signed-off-by: Chris Ball <cjb@laptop.org>
-rw-r--r--drivers/mmc/host/sh_mmcif.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 43cd0b5..7eaee3e 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -1104,7 +1104,6 @@ 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;
cancel_delayed_work_sync(&host->timeout_work);
@@ -1152,13 +1151,14 @@ static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
case MMCIF_WAIT_FOR_READ_END:
case MMCIF_WAIT_FOR_WRITE_END:
if (host->sd_error)
- data->error = sh_mmcif_error_manage(host);
+ mrq->data->error = sh_mmcif_error_manage(host);
break;
default:
BUG();
}
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;
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