gpio: virtuser: check the return value of gpiod_set_value()

We converted gpiod_set_value() and its variants to return an integer to
indicate failures. Check the return value where it's ignored currently
so that user-space agents controlling the virtual user module can get
notified about errors.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpio-virtuser.c b/drivers/gpio/gpio-virtuser.c
index a10eab7d2617e40cefb5f08e1211e9cb33035d0d..37f2ce20f1ae72c70fb5c69a8697ca49659215ad 100644 (file)
--- a/drivers/gpio/gpio-virtuser.c
+++ b/drivers/gpio/gpio-virtuser.c
@@ -500,9 +500,7 @@ static int gpio_virtuser_value_set(void *data, u64 val)
        if (val > 1)
                return -EINVAL;
 
-       gpiod_set_value_cansleep(ld->ad.desc, (int)val);
-
-       return 0;
+       return gpiod_set_value_cansleep(ld->ad.desc, (int)val);
 }
 
 DEFINE_DEBUGFS_ATTRIBUTE(gpio_virtuser_value_fops,
@@ -543,7 +541,7 @@ static void gpio_virtuser_set_value_atomic(struct irq_work *work)
        struct gpio_virtuser_irq_work_context *ctx =
                        to_gpio_virtuser_irq_work_context(work);
 
-       gpiod_set_value(ctx->desc, ctx->val);
+       ctx->ret = gpiod_set_value(ctx->desc, ctx->val);
        complete(&ctx->work_completion);
 }
 
@@ -562,7 +560,7 @@ static int gpio_virtuser_value_atomic_set(void *data, u64 val)
 
        gpio_virtuser_irq_work_queue_sync(&ctx);
 
-       return 0;
+       return ctx.ret;
 }
 
 DEFINE_DEBUGFS_ATTRIBUTE(gpio_virtuser_value_atomic_fops,