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mmc: cqhci: Commit descriptors before setting the doorbell

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commit c07d0073b9 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>
This commit is contained in:
Faiz Abbas 2019-10-15 00:08:49 +05:30 committed by Greg Kroah-Hartman
parent 6ea856efef
commit 01a44055a4
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/cqhci.c
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@ -617,7 +617,8 @@ static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
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",