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drm/display: use ERR_PTR on DP tunnel manager creation fail

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commit 080b2e7b5e9ad23343e4b11f0751e4c724a78958 upstream.

Instead of returning a generic NULL on error from
drm_dp_tunnel_mgr_create(), use error pointers with informative codes
to align the function with stub that is executed when
CONFIG_DRM_DISPLAY_DP_TUNNEL is unset. This will also trigger IS_ERR()
in current caller (intel_dp_tunnerl_mgr_init()) instead of bypassing it
via NULL pointer.

v2: use error codes inside drm_dp_tunnel_mgr_create() instead of handling
 on caller's side (Michal, Imre)

v3: fixup commit message and add "CC"/"Fixes" lines (Andi),
 mention aligning function code with stub

Fixes: 91888b5b1a ("drm/i915/dp: Add support for DP tunnel BW allocation")
Cc: Imre Deak <imre.deak@intel.com>
Cc: <stable@vger.kernel.org> # v6.9+
Signed-off-by: Krzysztof Karas <krzysztof.karas@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/7q4fpnmmztmchczjewgm6igy55qt6jsm7tfd4fl4ucfq6yg2oy@q4lxtsu6445c
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Karas
2024-12-12 11:00:41 +00:00
committed by Greg Kroah-Hartman
parent eed704d8ab
commit d9369f0c9f
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/display/drm_dp_tunnel.c
+5 -5
View File
@@ -1896,8 +1896,8 @@ static void destroy_mgr(struct drm_dp_tunnel_mgr *mgr)
*
* Creates a DP tunnel manager for @dev.
*
* Returns a pointer to the tunnel manager if created successfully or NULL in
* case of an error.
* Returns a pointer to the tunnel manager if created successfully or error
* pointer in case of failure.
*/
struct drm_dp_tunnel_mgr *
drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
@@ -1907,7 +1907,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return NULL;
return ERR_PTR(-ENOMEM);
mgr->dev = dev;
init_waitqueue_head(&mgr->bw_req_queue);
@@ -1916,7 +1916,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
if (!mgr->groups) {
kfree(mgr);
return NULL;
return ERR_PTR(-ENOMEM);
}
#ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG
@@ -1927,7 +1927,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
if (!init_group(mgr, &mgr->groups[i])) {
destroy_mgr(mgr);
return NULL;
return ERR_PTR(-ENOMEM);
}
mgr->group_count++;