Commit b166010f authored by Roger Tseng's avatar Roger Tseng Committed by Lee Jones

mfd: rtsx_usb: Fix runtime PM deadlock

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.

Cc: <> # v3.16+
Fixes: 730876be ("mfd: Add realtek USB card reader driver")
Signed-off-by: default avatarRoger Tseng <>
[Lee: Removed newly unused variable]
Signed-off-by: default avatarLee Jones <>
parent f29ae369
......@@ -681,21 +681,9 @@ 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%04x\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.
return 0;
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