This is a note to let you know that I've just added the patch titled mmc: atmel-mci: fix race between stop command and start of next command to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-atmel-mci-fix-race-between-stop-command-and-star.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 2d39c95c64e1e35fa67bac4ee69b6c7a024aebde Author: Tobias Schramm <t.schramm@xxxxxxxxxxx> Date: Fri Dec 30 20:43:15 2022 +0100 mmc: atmel-mci: fix race between stop command and start of next command [ Upstream commit eca5bd666b0aa7dc0bca63292e4778968241134e ] This commit fixes a race between completion of stop command and start of a new command. Previously the command ready interrupt was enabled before stop command was written to the command register. This caused the command ready interrupt to fire immediately since the CMDRDY flag is asserted constantly while there is no command in progress. Consequently the command state machine will immediately advance to the next state when the tasklet function is executed again, no matter actual completion state of the stop command. Thus a new command can then be dispatched immediately, interrupting and corrupting the stop command on the CMD line. Fix that by dropping the command ready interrupt enable before calling atmci_send_stop_cmd. atmci_send_stop_cmd does already enable the command ready interrupt, no further writes to ATMCI_IER are necessary. Signed-off-by: Tobias Schramm <t.schramm@xxxxxxxxxxx> Acked-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20221230194315.809903-2-t.schramm@xxxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 9c084f64f7dba..4d8f2778d8f9a 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -1812,7 +1812,6 @@ static void atmci_tasklet_func(unsigned long priv) atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); state = STATE_WAITING_NOTBUSY; } else if (host->mrq->stop) { - atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY); atmci_send_stop_cmd(host, data); state = STATE_SENDING_STOP; } else { @@ -1845,8 +1844,6 @@ static void atmci_tasklet_func(unsigned long priv) * command to send. */ if (host->mrq->stop) { - atmci_writel(host, ATMCI_IER, - ATMCI_CMDRDY); atmci_send_stop_cmd(host, data); state = STATE_SENDING_STOP; } else {