We can use MEMSTICK_POWER_{ON,OFF} along with pm_runtime_{get,put}
helpers to let memstick host support runtime pm.
There's a small window between memstick_detect_change() and its queued
work, memstick_check(). In this window the rpm count may go down to zero
before the memstick host powers on, so the host can be inadvertently
suspended.
Increment rpm count before calling memstick_check(), and decrement rpm
count afterward, as now we are sure the memstick host should be
suspended or not.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
drivers/memstick/core/memstick.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 76382c858c35..5f16a8826401 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"
@@ -209,6 +210,7 @@ static int memstick_dummy_check(struct memstick_dev *card)
*/
void memstick_detect_change(struct memstick_host *host)
{
+ pm_runtime_get_noresume(host->dev.parent);
queue_work(workqueue, &host->media_checker);
}
EXPORT_SYMBOL(memstick_detect_change);
@@ -479,6 +481,8 @@ static void memstick_check(struct work_struct *work)
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");
}
--
2.17.1
