[PATCH] mmc: tmio: comment the ERR_PTR usage in this driver

[Wolfram Sang]

It is not super obvious why the driver sometimes uses an ERR_PTR for the
current mrq. Explain why in comments.

Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/mmc/host/tmio_mmc_core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index c253d176db69..93e912afd3ae 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -972,6 +972,7 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		return;
 	}
 
+	/* Disallow new mrqs and work handlers to run */
 	host->mrq = ERR_PTR(-EBUSY);
 
 	spin_unlock_irqrestore(&host->lock, flags);
@@ -1006,8 +1007,9 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 			"%s.%d: IOS interrupted: clk %u, mode %u",
 			current->comm, task_pid_nr(current),
 			ios->clock, ios->power_mode);
-	host->mrq = NULL;
 
+	/* Ready for new mrqs */
+	host->mrq = NULL;
 	host->clk_cache = ios->clock;
 
 	mutex_unlock(&host->ios_lock);
-- 
2.43.0