4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/04242630-42d8-4920-8c67-24ac9db6b3c9@moroto.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/nxp-ptn3460.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -64,15 +64,15 @@ static int ptn3460_read_bytes(struct ptn
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;
@@ -88,9 +88,9 @@ static int ptn3460_write_byte(struct ptn
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;
