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authorKai-Heng Feng <kai.heng.feng@canonical.com>2018-11-05 16:45:04 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 08:26:24 +0100
commite03e303edf1c63e6dd455ccd568c74e93ef3ba8c (patch)
tree2c4b60c638744b26bf4456569b7c0e597833a5f5 /drivers/memstick/core
parent883a87ddf2f118fbce617b1b3472b8224803eb14 (diff)
memstick: Prevent memstick host from getting runtime suspended during card detection
We can use MEMSTICK_POWER_{ON,OFF} along with pm_runtime_{get,put} helpers to let memstick host support runtime pm. The rpm count may go down to zero before the memstick host powers on, so the host can be runtime suspended. So before doing card detection, increment the rpm count to avoid the host gets runtime suspended. Balance the rpm count after card detection is done. Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/memstick/core')
-rw-r--r--drivers/memstick/core/memstick.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 76382c858c35..1246d69ba187 100644
--- a/drivers/memstick/core/memstick.c
+++ b/drivers/memstick/core/memstick.c
@@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#define DRIVER_NAME "memstick"
@@ -436,6 +437,7 @@ static void memstick_check(struct work_struct *work)
struct memstick_dev *card;
dev_dbg(&host->dev, "memstick_check started\n");
+ pm_runtime_get_noresume(host->dev.parent);
mutex_lock(&host->lock);
if (!host->card) {
if (memstick_power_on(host))
@@ -479,6 +481,7 @@ out_power_off:
host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
mutex_unlock(&host->lock);
+ pm_runtime_put(host->dev.parent);
dev_dbg(&host->dev, "memstick_check finished\n");
}