mmc: sh_mmcif: Add exclusion between cmd and interrupt
A command end interrupt should not be processed between command issue
and setting of wait_for flag. It expects already the flag to be set.
Therefore the exclusive control was added.
Signed-off-by: Kouichi Tomita <kouichi.tomita.yn@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index e075804..072f670 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -875,6 +875,7 @@
struct mmc_command *cmd = mrq->cmd;
u32 opc = cmd->opcode;
u32 mask;
+ unsigned long flags;
switch (opc) {
/* response busy check */
@@ -909,10 +910,12 @@
/* set arg */
sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
/* set cmd */
+ spin_lock_irqsave(&host->lock, flags);
sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
host->wait_for = MMCIF_WAIT_FOR_CMD;
schedule_delayed_work(&host->timeout_work, host->timeout);
+ spin_unlock_irqrestore(&host->lock, flags);
}
static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
@@ -1171,6 +1174,12 @@
struct sh_mmcif_host *host = dev_id;
struct mmc_request *mrq;
bool wait = false;
+ unsigned long flags;
+ int wait_work;
+
+ spin_lock_irqsave(&host->lock, flags);
+ wait_work = host->wait_for;
+ spin_unlock_irqrestore(&host->lock, flags);
cancel_delayed_work_sync(&host->timeout_work);
@@ -1188,7 +1197,7 @@
* All handlers return true, if processing continues, and false, if the
* request has to be completed - successfully or not
*/
- switch (host->wait_for) {
+ switch (wait_work) {
case MMCIF_WAIT_FOR_REQUEST:
/* We're too late, the timeout has already kicked in */
mutex_unlock(&host->thread_lock);