From: Xin Ji <xji@analogixsemi.com>
To: narmstrong@baylibre.com, dan.carpenter@oracle.com,
robert.foss@linaro.org, Laurent.pinchart@ideasonboard.com,
jonas@kwiboo.se, jernej.skrabec@gmail.com, airlied@linux.ie,
daniel@ffwll.ch, sam@ravnborg.org, pihsun@chromium.org,
tzungbi@google.com, maxime@cerno.tech, drinkcat@google.com,
hsinyi@chromium.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, bliang@analogixsemi.com,
qwen@analogixsemi.com
Cc: Xin Ji <xji@analogixsemi.com>
Subject: [PATCH v3] drm/bridge: anx7625: Check GPIO description to avoid crash
Date: Thu, 18 Nov 2021 13:47:48 +0800 [thread overview]
Message-ID: <20211118054748.3797062-1-xji@analogixsemi.com> (raw)
As GPIO probe function "devm_gpiod_get_optional()" may return error
code, driver should identify GPIO desc as NULL to avoid crash.
Acked-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Xin Ji <xji@analogixsemi.com>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 001fb39d9919..652ae814246d 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1098,9 +1098,18 @@ static void anx7625_init_gpio(struct anx7625_data *platform)
/* Gpio for chip power enable */
platform->pdata.gpio_p_on =
devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR_OR_NULL(platform->pdata.gpio_p_on)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "no enable gpio found\n");
+ platform->pdata.gpio_p_on = NULL;
+ }
+
/* Gpio for chip reset */
platform->pdata.gpio_reset =
devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR_OR_NULL(platform->pdata.gpio_reset)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "no reset gpio found\n");
+ platform->pdata.gpio_reset = NULL;
+ }
if (platform->pdata.gpio_p_on && platform->pdata.gpio_reset) {
platform->pdata.low_power_mode = 1;
--
2.25.1
reply other threads:[~2021-11-18 5:48 UTC|newest]
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