4.14-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 4.17.12 / wlcore-sdio-check-for-valid-platform-device-data-before-suspend.patch

From foo@baz Sat Jul 28 10:14:30 CEST 2018
From: Eyal Reizer <eyalreizer@gmail.com>
Date: Mon, 28 May 2018 11:36:42 +0300
Subject: wlcore: sdio: check for valid platform device data before suspend

From: Eyal Reizer <eyalreizer@gmail.com>

[ Upstream commit 6e91d48371e79862ea2c05867aaebe4afe55a865 ]

the wl pointer can be null In case only wlcore_sdio is probed while
no WiLink module is successfully probed, as in the case of mounting a
wl12xx module while using a device tree file configured with wl18xx
related settings.
In this case the system was crashing in wl1271_suspend() as platform
device data is not set.
Make sure wl the pointer is valid before using it.

Signed-off-by: Eyal Reizer <eyalr@ti.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/ti/wlcore/sdio.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -406,6 +406,11 @@ static int wl1271_suspend(struct device
 	mmc_pm_flag_t sdio_flags;
 	int ret = 0;
 
+	if (!wl) {
+		dev_err(dev, "no wilink module was probed\n");
+		goto out;
+	}
+
 	dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
 		wl->wow_enabled);