linux-kernel - [PATCH v3 07/19] drm/panel: sitronix-st7789v: improve error handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230714013756.1546769-8-sre@kernel.org>
Date:   Fri, 14 Jul 2023 03:37:44 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Gerald Loacker <gerald.loacker@...fvision.net>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v3 07/19] drm/panel: sitronix-st7789v: improve error handling

Improve error handling in the probe routine, so that probe
defer errors are captured in /sys/kernel/debug/devices_deferred

Reviewed-by: Michael Riesch <michael.riesch@...fvision.net>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 .../gpu/drm/panel/panel-sitronix-st7789v.c    | 23 ++++++++++---------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index 6290bd49d055..a6d6155ef45c 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -348,32 +348,33 @@ static const struct drm_panel_funcs st7789v_drm_funcs = {
 
 static int st7789v_probe(struct spi_device *spi)
 {
+	struct device *dev = &spi->dev;
 	struct st7789v *ctx;
 	int ret;
 
-	ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 
 	spi_set_drvdata(spi, ctx);
 	ctx->spi = spi;
 
-	drm_panel_init(&ctx->panel, &spi->dev, &st7789v_drm_funcs,
+	drm_panel_init(&ctx->panel, dev, &st7789v_drm_funcs,
 		       DRM_MODE_CONNECTOR_DPI);
 
-	ctx->power = devm_regulator_get(&spi->dev, "power");
-	if (IS_ERR(ctx->power))
-		return PTR_ERR(ctx->power);
+	ctx->power = devm_regulator_get(dev, "power");
+	ret = PTR_ERR_OR_ZERO(ctx->power);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get regulator\n");
 
-	ctx->reset = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
-	if (IS_ERR(ctx->reset)) {
-		dev_err(&spi->dev, "Couldn't get our reset line\n");
-		return PTR_ERR(ctx->reset);
-	}
+	ctx->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	ret = PTR_ERR_OR_ZERO(ctx->reset);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get reset line\n");
 
 	ret = drm_panel_of_backlight(&ctx->panel);
 	if (ret)
-		return ret;
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
 
 	drm_panel_add(&ctx->panel);
 
-- 
2.40.1