From: Roger Tseng <rogerable@realtek.com>
Date: Thu, 15 Jan 2015 07:14:44 +0000 (+0800)
Subject: mfd: rtsx_usb: Fix runtime PM deadlock
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~251^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b166010f6afbadb896efa37ff85eb681a8f89392;p=pandora-kernel.git

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: <stable@vger.kernel.org> # v3.16+
Fixes: 730876be2566 ("mfd: Add realtek USB card reader driver")
Signed-off-by: Roger Tseng <rogerable@realtek.com>
[Lee: Removed newly unused variable]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

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