From: Guennadi Liakhovetski Date: Wed, 22 Aug 2012 06:49:47 +0000 (+0000) Subject: mmc: sh-mmcif: avoid oops on spurious interrupts (second try) X-Git-Tag: v3.4.24~26 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=47dc7057a276a3394c94803dd66b395664ebc8f0;p=karo-tx-linux.git 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 --- diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c index 724b35e85a26..a5786a837a29 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; cancel_delayed_work_sync(&host->timeout_work); @@ -1114,13 +1113,14 @@ 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;