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For data read commands, SDHC may initiate data transfers even before it completely process the command response. In case command itself fails, driver un-maps the memory associated with data transfer but this memory can still be accessed by SDHC for the already initiated data transfer. This scenario can lead to un-mapped memory access error. To avoid this scenario, reset SDHC (when command fails) prior to un-mapping memory. Resetting SDHC ensures that all in-flight data transfers are either aborted or completed. So we don't run into this scenario. Swap the reset, un-map steps sequence in sdhci_request_done(). Bug: 186781699 (cherry picked from commit 21e35e898aa9ef7781632959db8613a5380f2eae git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git remotes/origin/next) Link: https://lore.kernel.org/r/1614760331-43499-1-git-send-email-pragalla@qti.qualcomm.com Suggested-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/1614760331-43499-1-git-send-email-pragalla@qti.qualcomm.com Cc: stable@vger.kernel.org # v4.9+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Pradeep P V K <pragalla@codeaurora.org> Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org> Change-Id: I547ea7c1b3e2b9026313d6e17b09851eef520c22