3.16.7-ckt6 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Roger Tseng <rogerable@xxxxxxxxxxx>
commit b166010f6afbadb896efa37ff85eb681a8f89392 upstream.
sd_set_power_mode() in derived module drivers/mmc/host/rtsx_usb_sdmmc.c
acquires dev_mutex and then calls pm_runtime_get_sync() to make sure the
device is awake while initializing a newly inserted card. Once it is
called during suspending state and explicitly before rtsx_usb_suspend()
acquires the same dev_mutex, both routine deadlock and further hang the
driver because pm_runtime_get_sync() waits the pending PM operations.
Fix this by using an empty suspend method. mmc_core always turns the
LED off after a request is done and thus it is ok to remove the only
rtsx_usb_turn_off_led() here.
Fixes: 730876be2566 ("mfd: Add realtek USB card reader driver")
Signed-off-by: Roger Tseng <rogerable@xxxxxxxxxxx>
[Lee: Removed newly unused variable]
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/mfd/rtsx_usb.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 71f387ce8cbd..8ce5aa0f7474 100644
--- a/drivers/mfd/rtsx_usb.c
+++ b/drivers/mfd/rtsx_usb.c
@@ -681,21 +681,10 @@ static void rtsx_usb_disconnect(struct usb_interface *intf)
#ifdef CONFIG_PM
static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
{
- struct rtsx_ucr *ucr =
- (struct rtsx_ucr *)usb_get_intfdata(intf);
dev_dbg(&intf->dev, "%s called with pm message 0x%04u\n",
__func__, message.event);
- /*
- * Call to make sure LED is off during suspend to save more power.
- * It is NOT a permanent state and could be turned on anytime later.
- * Thus no need to call turn_on when resunming.
- */
- mutex_lock(&ucr->dev_mutex);
- rtsx_usb_turn_off_led(ucr);
- mutex_unlock(&ucr->dev_mutex);
-
return 0;
}
--
2.1.4
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