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    Subject[PATCH 5.3 142/197] mmc: cqhci: Commit descriptors before setting the doorbell
    Date
    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
    @@ -611,7 +611,8 @@ 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",

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