This is a note to let you know that I've just added the patch titled
drm/amd/display: drop unnecessary NULL checks in debugfs
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-drop-unnecessary-null-checks-in-debu.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d0bfe387038bc7b99948146c0ed1e5dccf9c366d
Author: Alexey Kodanev <aleksei.kodanev@xxxxxxxxxxx>
Date: Tue Dec 27 20:04:15 2022 +0300
drm/amd/display: drop unnecessary NULL checks in debugfs
[ Upstream commit f8e12e770e8049917f82387033b3cf44bc43b915 ]
pipe_ctx pointer cannot be NULL when getting the address of
an element of the pipe_ctx array. Moreover, the MAX_PIPES is
defined as 6, so pipe_ctx is not NULL after the loop either.
Detected using the static analysis tool - Svace.
Signed-off-by: Alexey Kodanev <aleksei.kodanev@xxxxxxxxxxx>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Stable-dep-of: 892b41b16f61 ("drm/amd/display: Fix incorrect DSC instance for MST")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index fc0f6b0089ba0..939734eecf709 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1315,16 +1315,11 @@ static ssize_t dp_dsc_clock_en_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -1421,12 +1416,12 @@ static ssize_t dp_dsc_clock_en_write(struct file *f, const char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx || !pipe_ctx->stream)
+ if (!pipe_ctx->stream)
goto done;
// Get CRTC state
@@ -1506,16 +1501,11 @@ static ssize_t dp_dsc_slice_width_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -1610,12 +1600,12 @@ static ssize_t dp_dsc_slice_width_write(struct file *f, const char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx || !pipe_ctx->stream)
+ if (!pipe_ctx->stream)
goto done;
// Safely get CRTC state
@@ -1695,16 +1685,11 @@ static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -1799,12 +1784,12 @@ static ssize_t dp_dsc_slice_height_write(struct file *f, const char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx || !pipe_ctx->stream)
+ if (!pipe_ctx->stream)
goto done;
// Get CRTC state
@@ -1880,16 +1865,11 @@ static ssize_t dp_dsc_bits_per_pixel_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -1981,12 +1961,12 @@ static ssize_t dp_dsc_bits_per_pixel_write(struct file *f, const char __user *bu
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx || !pipe_ctx->stream)
+ if (!pipe_ctx->stream)
goto done;
// Get CRTC state
@@ -2060,16 +2040,11 @@ static ssize_t dp_dsc_pic_width_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -2121,16 +2096,11 @@ static ssize_t dp_dsc_pic_height_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -2197,16 +2167,11 @@ static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
@@ -2273,16 +2238,11 @@ static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf,
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
- if (pipe_ctx && pipe_ctx->stream &&
+ if (pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
- if (!pipe_ctx) {
- kfree(rd_buf);
- return -ENXIO;
- }
-
dsc = pipe_ctx->stream_res.dsc;
if (dsc)
dsc->funcs->dsc_read_state(dsc, &dsc_state);
