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@bell-sw.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 892b41b16f61 ("drm/amd/display: Fix incorrect DSC instance for MST")
Signed-off-by: Sasha Levin <sashal@kernel.org>

1 files changed, 16 insertions, 56 deletions

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 ff7dd17ad076..35ea58fbc1d9 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
@@ -1369,16 +1369,11 @@ 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);
@@ -1475,12 +1470,12 @@ 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
@@ -1560,16 +1555,11 @@ 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);
@@ -1664,12 +1654,12 @@ 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
@@ -1749,16 +1739,11 @@ 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);
@@ -1853,12 +1838,12 @@ 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
@@ -1934,16 +1919,11 @@ 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);
@@ -2035,12 +2015,12 @@ 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
@@ -2114,16 +2094,11 @@ 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);
@@ -2175,16 +2150,11 @@ 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);
@@ -2251,16 +2221,11 @@ 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);
@@ -2327,16 +2292,11 @@ 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);