wlcore: sdio: check for valid platform device data before suspend

BugLink: http://bugs.launchpad.net/bugs/1815234
[ 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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
index f8a1fea64e2567c6b368e2fc93a667b1a9bbb0ae..219d1a86b92ecb3f48491ab8034ef62e74790d38 100644 (file)
--- 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 *dev)
        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);