From: Tim Gardner <tim.gardner@canonical.com>
To: dri-devel@lists.freedesktop.org
Cc: tim.gardner@canonical.com,
William Breathitt Gray <vilhelm.gray@gmail.com>,
Syed Nayyar Waris <syednwaris@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Robert Foss <robert.foss@linaro.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm/bridge: parade-ps8640: check return values in ps8640_aux_transfer()
Date: Fri, 24 Sep 2021 09:26:07 -0600 [thread overview]
Message-ID: <20210924152607.28580-1-tim.gardner@canonical.com> (raw)
Coverity complains of an unused return code:
CID 120459 (#1 of 1): Unchecked return value (CHECKED_RETURN)
7. check_return: Calling regmap_bulk_write without checking return value (as is
done elsewhere 199 out of 291 times).
204 regmap_bulk_write(map, PAGE0_SWAUX_ADDR_7_0, addr_len,
205 ARRAY_SIZE(addr_len));
While I was at it I noticed 2 other places where return codes were not being
used, or used incorrectly (which is a real bug).
Fix these errors by correctly using the returned error codes.
Cc: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: linux-iio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
---
drivers/gpu/drm/bridge/parade-ps8640.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 3aaa90913bf8..591da962970a 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -201,8 +201,12 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux,
addr_len[PAGE0_SWAUX_LENGTH - base] = (len == 0) ? SWAUX_NO_PAYLOAD :
((len - 1) & SWAUX_LENGTH_MASK);
- regmap_bulk_write(map, PAGE0_SWAUX_ADDR_7_0, addr_len,
+ ret = regmap_bulk_write(map, PAGE0_SWAUX_ADDR_7_0, addr_len,
ARRAY_SIZE(addr_len));
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to bulk write ADDR_7_0: %d\n", ret);
+ return ret;
+ }
if (len && (request == DP_AUX_NATIVE_WRITE ||
request == DP_AUX_I2C_WRITE)) {
@@ -218,13 +222,17 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux,
}
}
- regmap_write(map, PAGE0_SWAUX_CTRL, SWAUX_SEND);
+ ret = regmap_write(map, PAGE0_SWAUX_CTRL, SWAUX_SEND);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to write SEND: %d\n", ret);
+ return ret;
+ }
/* Zero delay loop because i2c transactions are slow already */
regmap_read_poll_timeout(map, PAGE0_SWAUX_CTRL, data,
!(data & SWAUX_SEND), 0, 50 * 1000);
- regmap_read(map, PAGE0_SWAUX_STATUS, &data);
+ ret = regmap_read(map, PAGE0_SWAUX_STATUS, &data);
if (ret) {
DRM_DEV_ERROR(dev, "failed to read PAGE0_SWAUX_STATUS: %d\n",
ret);
--
2.33.0
next reply other threads:[~2021-09-24 15:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 15:26 Tim Gardner [this message]
2021-09-24 16:03 ` [PATCH] drm/bridge: parade-ps8640: check return values in ps8640_aux_transfer() Tim Gardner
2021-09-25 0:45 ` William Breathitt Gray
2021-10-11 10:07 ` Robert Foss
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=20210924152607.28580-1-tim.gardner@canonical.com \
--to=tim.gardner@canonical.com \
--cc=Laurent.pinchart@ideasonboard.com \
--cc=a.hajda@samsung.com \
--cc=airlied@linux.ie \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=jernej.skrabec@gmail.com \
--cc=jonas@kwiboo.se \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=narmstrong@baylibre.com \
--cc=robert.foss@linaro.org \
--cc=syednwaris@gmail.com \
--cc=vilhelm.gray@gmail.com \
/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;
as well as URLs for NNTP newsgroup(s).