From: Nai-Chen Cheng <bleach1827@gmail.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>,
Simona Vetter <simona@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-kernel-mentees@lists.linux.dev,
Nai-Chen Cheng <bleach1827@gmail.com>
Subject: [PATCH] drm/dp: Simplify return statement in drm_edp_backlight_enable
Date: Mon, 18 Aug 2025 13:25:18 +0800 [thread overview]
Message-ID: <20250818-drm-dp-helper-logically-dead-code-v1-1-080f76699c0f@gmail.com> (raw)
Remove dead code in error handling path. When drm_dp_dpcd_write_byte()
fails and ret < 0, the condition in "ret < 0 ? ret : -EIO" will always
be true, making -EIO unreachable.
Simplify by directly returning the error code from
drm_dp_dpcd_write_byte(), which provides more specific error information
for debugging.
Found by Coverity(CID 1649043).
Signed-off-by: Nai-Chen Cheng <bleach1827@gmail.com>
---
drivers/gpu/drm/display/drm_dp_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index 1ecc3df7e3167d13636e194c4aab44ee8979aa11..b022ee136db2eb3b721ef918650525202dd22035 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -4079,7 +4079,7 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli
if (ret < 0) {
drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n",
aux->name, ret);
- return ret < 0 ? ret : -EIO;
+ return ret;
}
ret = drm_edp_backlight_set_level(aux, bl, level);
---
base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9
change-id: 20250818-drm-dp-helper-logically-dead-code-b99252fbfcec
Best regards,
--
Nai-Chen Cheng <bleach1827@gmail.com>
reply other threads:[~2025-08-18 5:25 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250818-drm-dp-helper-logically-dead-code-v1-1-080f76699c0f@gmail.com \
--to=bleach1827@gmail.com \
--cc=airlied@gmail.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-kernel-mentees@lists.linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mripard@kernel.org \
--cc=simona@ffwll.ch \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox