linux-kernel - [PATCH] gpio: virtuser: check the return value of gpiod_set

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Message-ID: <20250922095841.52330-1-brgl@bgdev.pl>
Date: Mon, 22 Sep 2025 11:58:41 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] gpio: virtuser: check the return value of gpiod_set_value()

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

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@...aro.org>
---
 drivers/gpio/gpio-virtuser.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-virtuser.c b/drivers/gpio/gpio-virtuser.c
index a10eab7d2617..37f2ce20f1ae 100644
--- 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,
-- 
2.48.1