drm/amd/display: drop unnecessary NULL checks in debugfs

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>

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 a29952cd8f2290fe1551f2e238d8123c605e09fb..ae54a971991012e7c17234d4284e06d67dec7d37 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1375,16 +1375,11 @@ 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);
@@ -1481,12 +1476,12 @@ 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
@@ -1566,16 +1561,11 @@ 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);
@@ -1670,12 +1660,12 @@ 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
@@ -1755,16 +1745,11 @@ 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);
@@ -1859,12 +1844,12 @@ 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
@@ -1940,16 +1925,11 @@ 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);
@@ -2041,12 +2021,12 @@ 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
@@ -2120,16 +2100,11 @@ 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);
@@ -2181,16 +2156,11 @@ 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);
@@ -2257,16 +2227,11 @@ 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);
@@ -2333,16 +2298,11 @@ 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);