Input: ads7846 - check proper condition when freeing gpio

When driver uses custom pendown detection method gpio_pendown is not
set up and so we should not try to free it, otherwise we are presented
with:

------------[ cut here ]------------
WARNING: at drivers/gpio/gpiolib.c:1258 gpio_free+0x100/0x12c()
Modules linked in:
[<c0061208>] (unwind_backtrace+0x0/0xe4) from [<c0091f58>](warn_slowpath_common+0x4c/0x64)
[<c0091f58>] (warn_slowpath_common+0x4c/0x64) from [<c0091f88>](warn_slowpath_null+0x18/0x1c)
[<c0091f88>] (warn_slowpath_null+0x18/0x1c) from [<c024e610>](gpio_free+0x100/0x12c)
[<c024e610>] (gpio_free+0x100/0x12c) from [<c03e9fbc>](ads7846_probe+0xa38/0xc5c)
[<c03e9fbc>] (ads7846_probe+0xa38/0xc5c) from [<c02cff14>](spi_drv_probe+0x18/0x1c)
[<c02cff14>] (spi_drv_probe+0x18/0x1c) from [<c028bca4>](driver_probe_device+0xc8/0x184)
[<c028bca4>] (driver_probe_device+0xc8/0x184) from [<c028bdc8>](__driver_attach+0x68/0x8c)
[<c028bdc8>] (__driver_attach+0x68/0x8c) from [<c028b4c8>](bus_for_each_dev+0x48/0x74)
[<c028b4c8>] (bus_for_each_dev+0x48/0x74) from [<c028ae08>](bus_add_driver+0xa0/0x220)
[<c028ae08>] (bus_add_driver+0xa0/0x220) from [<c028c0c0>](driver_register+0xa8/0x134)
[<c028c0c0>] (driver_register+0xa8/0x134) from [<c0050550>](do_one_initcall+0xcc/0x1a4)
[<c0050550>] (do_one_initcall+0xcc/0x1a4) from [<c00084e4>](kernel_init+0x14c/0x214)
[<c00084e4>] (kernel_init+0x14c/0x214) from [<c005b494>](kernel_thread_exit+0x0/0x8)
---[ end trace 4053287f8a5ec18f ]---

Also rearrange ads7846_setup_pendown() to have only one exit point
returning success.

Reported-by: Sourav Poddar <sourav.poddar@ti.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Reviewed-by: Charulatha V <charu@ti.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 14ea54b78e4648b0ac8a3403440f6f5d120dfdd9..4bf2316e3284b8db426e6e11d2dfda72166b1278 100644 (file)
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -941,28 +941,29 @@ static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads784
        struct ads7846_platform_data *pdata = spi->dev.platform_data;
        int err;
 
-       /* REVISIT when the irq can be triggered active-low, or if for some
+       /*
+        * REVISIT when the irq can be triggered active-low, or if for some
         * reason the touchscreen isn't hooked up, we don't need to access
         * the pendown state.
         */
-       if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
-               dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
-               return -EINVAL;
-       }
 
        if (pdata->get_pendown_state) {
                ts->get_pendown_state = pdata->get_pendown_state;
-               return 0;
-       }
+       } else if (gpio_is_valid(pdata->gpio_pendown)) {
 
-       err = gpio_request(pdata->gpio_pendown, "ads7846_pendown");
-       if (err) {
-               dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
-                       pdata->gpio_pendown);
-               return err;
-       }
+               err = gpio_request(pdata->gpio_pendown, "ads7846_pendown");
+               if (err) {
+                       dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
+                               pdata->gpio_pendown);
+                       return err;
+               }
 
-       ts->gpio_pendown = pdata->gpio_pendown;
+               ts->gpio_pendown = pdata->gpio_pendown;
+
+       } else {
+               dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
+               return -EINVAL;
+       }
 
        return 0;
 }
@@ -1353,7 +1354,7 @@ static int __devinit ads7846_probe(struct spi_device *spi)
  err_put_regulator:
        regulator_put(ts->reg);
  err_free_gpio:
-       if (ts->gpio_pendown != -1)
+       if (!ts->get_pendown_state)
                gpio_free(ts->gpio_pendown);
  err_cleanup_filter:
        if (ts->filter_cleanup)
@@ -1383,8 +1384,13 @@ static int __devexit ads7846_remove(struct spi_device *spi)
        regulator_disable(ts->reg);
        regulator_put(ts->reg);
 
-       if (ts->gpio_pendown != -1)
+       if (!ts->get_pendown_state) {
+               /*
+                * If we are not using specialized pendown method we must
+                * have been relying on gpio we set up ourselves.
+                */
                gpio_free(ts->gpio_pendown);
+       }
 
        if (ts->filter_cleanup)
                ts->filter_cleanup(ts->filter_data);