mmc: usdhi6rol0: handle NULL data in timeout

Commit bb08a7d489bd ("mmc: usdhi6rol0: fix NULL pointer deref in debug
print") fixed one NULL pointer dereference but unfortunately introduced
another.  "data" may be NULL if this is a command timeout for a command
without any data, so we should only use it if we're actually waiting for
data.

Fixes: bb08a7d489bd ("mmc: usdhi6rol0: fix NULL pointer deref in debug print")
Cc: stable@vger.kernel.org # v4.3
Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
index 4498e92116b808d2a62f6e146f33f3b41838ee33..b47122d3e8d8c71b435cdc47a275f349bf102a22 100644 (file)
--- a/drivers/mmc/host/usdhi6rol0.c
+++ b/drivers/mmc/host/usdhi6rol0.c
@@ -1634,7 +1634,7 @@ static void usdhi6_timeout_work(struct work_struct *work)
        struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work);
        struct mmc_request *mrq = host->mrq;
        struct mmc_data *data = mrq ? mrq->data : NULL;
-       struct scatterlist *sg = host->sg ?: data->sg;
+       struct scatterlist *sg;
 
        dev_warn(mmc_dev(host->mmc),
                 "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n",
@@ -1666,6 +1666,7 @@ static void usdhi6_timeout_work(struct work_struct *work)
        case USDHI6_WAIT_FOR_MWRITE:
        case USDHI6_WAIT_FOR_READ:
        case USDHI6_WAIT_FOR_WRITE:
+               sg = host->sg ?: data->sg;
                dev_dbg(mmc_dev(host->mmc),
                        "%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n",
                        data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx,