drm/bridge: nxp-ptn3460: simplify some error checking

commit 28d3d0696688154cc04983f343011d07bf0508e4 upstream.

The i2c_master_send/recv() functions return negative error codes or
they return "len" on success.  So the error handling here can be written
as just normal checks for "if (ret < 0) return ret;".  No need to
complicate things.

Btw, in this code the "len" parameter can never be zero, but even if
it were, then I feel like this would still be the best way to write it.

Fixes: 914437992876 ("drm/bridge: nxp-ptn3460: fix i2c_master_send() error checking")
Suggested-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/04242630-42d8-4920-8c67-24ac9db6b3c9@moroto.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
index 9b7eb8c..7c0076e 100644 (file)
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -54,15 +54,15 @@ static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
        int ret;
 
        ret = i2c_master_send(ptn_bridge->client, &addr, 1);
-       if (ret <= 0) {
+       if (ret < 0) {
                DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
-               return ret ?: -EIO;
+               return ret;
        }
 
        ret = i2c_master_recv(ptn_bridge->client, buf, len);
-       if (ret != len) {
+       if (ret < 0) {
                DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
-               return ret < 0 ? ret : -EIO;
+               return ret;
        }
 
        return 0;
@@ -78,9 +78,9 @@ static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
        buf[1] = val;
 
        ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
-       if (ret != ARRAY_SIZE(buf)) {
+       if (ret < 0) {
                DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
-               return ret < 0 ? ret : -EIO;
+               return ret;
        }
 
        return 0;