Re: [PATCH] drm/bridge: parade-ps8640: check return values in ps8640_aux_transfer()

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On 9/24/21 9:26 AM, Tim Gardner wrote:
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@xxxxxxxxx>
Cc: Syed Nayyar Waris <syednwaris@xxxxxxxxx>
Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Cc: Robert Foss <robert.foss@xxxxxxxxxx>
Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Jonas Karlman <jonas@xxxxxxxxx>
Cc: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: linux-iio@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
---
  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);


I forgot to mention this patch is for linux-next next-20210924.

-----------
Tim Gardner
Canonical, Inc



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