From 13837cb45c779fff942d2b08af1d0c7551c4ffc6 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Wed, 22 Aug 2012 06:49:47 +0000 Subject: [PATCH] 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 Signed-off-by: Guennadi Liakhovetski Tested-by: Tetsuyuki Kobayashi Signed-off-by: Chris Ball Signed-off-by: Greg Kroah-Hartman --- 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 ab10a1de3773..2671202833b9 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; -- 2.34.1