From: Faiz Abbas faiz_abbas@ti.com
commit c07d0073b9ec80a139d07ebf78e9c30d2a28279e upstream.
Add a write memory barrier to make sure that descriptors are actually written to memory, before ringing the doorbell.
Signed-off-by: Faiz Abbas faiz_abbas@ti.com Acked-by: Adrian Hunter adrian.hunter@intel.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mmc/host/cqhci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/mmc/host/cqhci.c +++ b/drivers/mmc/host/cqhci.c @@ -617,7 +617,8 @@ static int cqhci_request(struct mmc_host cq_host->slot[tag].flags = 0;
cq_host->qcnt += 1; - + /* Make sure descriptors are ready before ringing the doorbell */ + wmb(); cqhci_writel(cq_host, 1 << tag, CQHCI_TDBR); if (!(cqhci_readl(cq_host, CQHCI_TDBR) & (1 << tag))) pr_debug("%s: cqhci: doorbell not set for tag %d\n",