greybus: don't assume subdevs are valid

Most of the disconnect routines for the "subdevs" of a module
blindly assume that initialization of the subdev was successful.

Fix this by checking for null pointers.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

diff --git a/drivers/staging/greybus/battery-gb.c b/drivers/staging/greybus/battery-gb.c
index 1ef2f17..eaced9a 100644 (file)
--- a/drivers/staging/greybus/battery-gb.c
+++ b/drivers/staging/greybus/battery-gb.c
@@ -135,6 +135,8 @@ void gb_battery_disconnect(struct gb_module *gmod)
        struct gb_battery *gb;
 
        gb = gmod->gb_battery;
+       if (!gb)
+               return;
 
        power_supply_unregister(&gb->bat);
 

diff --git a/drivers/staging/greybus/gpio-gb.c b/drivers/staging/greybus/gpio-gb.c
index 2369175..da20028 100644 (file)
--- a/drivers/staging/greybus/gpio-gb.c
+++ b/drivers/staging/greybus/gpio-gb.c
@@ -92,6 +92,8 @@ void gb_gpio_disconnect(struct gb_module *gmod)
        int retval;
 
        gb_gpio_dev = gmod->gb_gpio_dev;
+       if (!gb_gpio_dev)
+               return;
 
        retval = gpiochip_remove(&gb_gpio_dev->chip);
        kfree(gb_gpio_dev);

diff --git a/drivers/staging/greybus/i2c-gb.c b/drivers/staging/greybus/i2c-gb.c
index c01f41b..0da1958 100644 (file)
--- a/drivers/staging/greybus/i2c-gb.c
+++ b/drivers/staging/greybus/i2c-gb.c
@@ -121,6 +121,8 @@ void gb_i2c_disconnect(struct gb_module *gmod)
        struct gb_i2c_device *gb_i2c_dev;
 
        gb_i2c_dev = gmod->gb_i2c_dev;
+       if (!gb_i2c_dev)
+               return;
        i2c_del_adapter(gb_i2c_dev->adapter);
        kfree(gb_i2c_dev->adapter);
        kfree(gb_i2c_dev);

diff --git a/drivers/staging/greybus/sdio-gb.c b/drivers/staging/greybus/sdio-gb.c
index f7e80ab..239fcf7 100644 (file)
--- a/drivers/staging/greybus/sdio-gb.c
+++ b/drivers/staging/greybus/sdio-gb.c
@@ -71,8 +71,10 @@ void gb_sdio_disconnect(struct gb_module *gmod)
        struct gb_sdio_host *host;
 
        host = gmod->gb_sdio_host;
-       mmc = host->mmc;
+       if (!host)
+               return;
 
+       mmc = host->mmc;
        mmc_remove_host(mmc);
        mmc_free_host(mmc);
 }