On Fri, Dec 13, 2024 at 05:29:30PM +0100, Andi Shyti wrote:

Hi,

who is going to take this patch? Can I merge it in drm-intel-next?

It has only DRM changes and is a fix for stable, so should be drm-misc-fixes. I merged it now there, thanks for the patch and the review.

Thanks, Andi

On Thu, Dec 12, 2024 at 11:00:41AM +0000, Krzysztof Karas wrote:

...

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: 91888b5b1ad2 ("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

---

drivers/gpu/drm/display/drm_dp_tunnel.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_tunnel.c b/drivers/gpu/drm/display/drm_dp_tunnel.c index 48b2df120086..90fe07a89260 100644 --- a/drivers/gpu/drm/display/drm_dp_tunnel.c +++ b/drivers/gpu/drm/display/drm_dp_tunnel.c @@ -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++; -- 2.34.1