Input: wm97xx-core - fix race on PHY init

The chip phy_init() function must be called before the dig_enable() function
but dig_enable() is called when the device is opened and we only call
phy_init() after having reigstered the device, meaning the two can race.
Fix this by doing the phy_init() before we register the input device.

Thanks to Rodolfo Giometti <giometti@enneenne.com> for the report.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 11 insertions, 11 deletions

diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index 8a00918cfa4..cdc24ad314e 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -608,6 +608,17 @@ static int wm97xx_probe(struct device *dev)
                 goto alloc_err;
         }
 
+        /* set up physical characteristics */
+        wm->codec->phy_init(wm);
+
+        /* load gpio cache */
+        wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
+        wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
+        wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
+        wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
+        wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
+        wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
+
         wm->input_dev = input_allocate_device();
         if (wm->input_dev == NULL) {
                 ret = -ENOMEM;
@@ -635,17 +646,6 @@ static int wm97xx_probe(struct device *dev)
         if (ret < 0)
                 goto dev_alloc_err;
 
-        /* set up physical characteristics */
-        wm->codec->phy_init(wm);
-
-        /* load gpio cache */
-        wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
-        wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
-        wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
-        wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
-        wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
-        wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
-
         /* register our battery device */
         wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
         if (!wm->battery_dev) {