Hi all,

After merging the driver-core tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

drivers/gpu/drm/drm_dp_aux_bus.c:106:13: error: initialization of 'void (*)(struct device *)' from incompatible pointer type 'int (*)(struct device *)' [-Werror=incompatible-pointer-types]
  106 |  .remove  = dp_aux_ep_remove,
      |             ^~~~~~~~~~~~~~~~
drivers/gpu/drm/drm_dp_aux_bus.c:106:13: note: (near initialization for 'dp_aux_bus_type.remove')

Caused by commit

  aeb33699fc2c ("drm: Introduce the DP AUX bus")

from the drm tree interacting with commit

  fc7a6209d571 ("bus: Make remove callback return void")

from the driver-core tree.

I applied the following merge fix patch.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 23 Jul 2021 14:58:25 +1000
Subject: [PATCH] fix for "drm: Introduce the DP AUX bus"

interaction with "bus: Make remove callback return void"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 drivers/gpu/drm/drm_dp_aux_bus.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_aux_bus.c b/drivers/gpu/drm/drm_dp_aux_bus.c
index e49a70f3691b..298ea7a49591 100644
--- a/drivers/gpu/drm/drm_dp_aux_bus.c
+++ b/drivers/gpu/drm/drm_dp_aux_bus.c
@@ -67,9 +67,8 @@ static int dp_aux_ep_probe(struct device *dev)
  *
  * Calls through to the endpoint driver remove.
  *
- * Return: 0 if no error or negative error code.
  */
-static int dp_aux_ep_remove(struct device *dev)
+static void dp_aux_ep_remove(struct device *dev)
 {
 	struct dp_aux_ep_driver *aux_ep_drv = to_dp_aux_ep_drv(dev->driver);
 	struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(dev);
@@ -77,8 +76,6 @@ static int dp_aux_ep_remove(struct device *dev)
 	if (aux_ep_drv->remove)
 		aux_ep_drv->remove(aux_ep);
 	dev_pm_domain_detach(dev, true);
-
-	return 0;
 }
 
 /**
-- 
2.30.2

-- 
Cheers,
Stephen Rothwell