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authorMichel Dänzer <mdaenzer@redhat.com>2021-06-16 12:46:51 +0200
committerAlex Deucher <alexander.deucher@amd.com>2021-06-21 17:21:49 -0400
commit4c6a23188e26339fd3dbc78e6ce6fe0fc4009553 (patch)
tree62eafbe8c6c9a99394fc024b47fc27a2790bf580 /drivers/gpu
parent13311e74253fe64329390df80bed3f07314ddd61 (diff)
drm/amdgpu: Call drm_framebuffer_init last for framebuffer init
Once drm_framebuffer_init has returned 0, the framebuffer is hooked up to the reference counting machinery and can no longer be destroyed with a simple kfree. Therefore, it must be called last. If drm_framebuffer_init returns 0 but its caller then returns non-0, there will likely be memory corruption fireworks down the road. The following lead me to this fix: [ 12.891228] kernel BUG at lib/list_debug.c:25! [...] [ 12.891263] RIP: 0010:__list_add_valid+0x4b/0x70 [...] [ 12.891324] Call Trace: [ 12.891330] drm_framebuffer_init+0xb5/0x100 [drm] [ 12.891378] amdgpu_display_gem_fb_verify_and_init+0x47/0x120 [amdgpu] [ 12.891592] ? amdgpu_display_user_framebuffer_create+0x10d/0x1f0 [amdgpu] [ 12.891794] amdgpu_display_user_framebuffer_create+0x126/0x1f0 [amdgpu] [ 12.891995] drm_internal_framebuffer_create+0x378/0x3f0 [drm] [ 12.892036] ? drm_internal_framebuffer_create+0x3f0/0x3f0 [drm] [ 12.892075] drm_mode_addfb2+0x34/0xd0 [drm] [ 12.892115] ? drm_internal_framebuffer_create+0x3f0/0x3f0 [drm] [ 12.892153] drm_ioctl_kernel+0xe2/0x150 [drm] [ 12.892193] drm_ioctl+0x3da/0x460 [drm] [ 12.892232] ? drm_internal_framebuffer_create+0x3f0/0x3f0 [drm] [ 12.892274] amdgpu_drm_ioctl+0x43/0x80 [amdgpu] [ 12.892475] __se_sys_ioctl+0x72/0xc0 [ 12.892483] do_syscall_64+0x33/0x40 [ 12.892491] entry_SYSCALL_64_after_hwframe+0x44/0xae Fixes: f258907fdd835e "drm/amdgpu: Verify bo size can fit framebuffer size on init." Signed-off-by: Michel Dänzer <mdaenzer@redhat.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_display.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index c13985fb35be..2a4cd7d377bf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -1047,11 +1047,12 @@ int amdgpu_display_gem_fb_init(struct drm_device *dev,
rfb->base.obj[0] = obj;
drm_helper_mode_fill_fb_struct(dev, &rfb->base, mode_cmd);
- ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
+
+ ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
if (ret)
goto err;
- ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
+ ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
if (ret)
goto err;
@@ -1071,9 +1072,6 @@ int amdgpu_display_gem_fb_verify_and_init(
rfb->base.obj[0] = obj;
drm_helper_mode_fill_fb_struct(dev, &rfb->base, mode_cmd);
- ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
- if (ret)
- goto err;
/* Verify that the modifier is supported. */
if (!drm_any_plane_has_format(dev, mode_cmd->pixel_format,
mode_cmd->modifier[0])) {
@@ -1092,6 +1090,10 @@ int amdgpu_display_gem_fb_verify_and_init(
if (ret)
goto err;
+ ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
+ if (ret)
+ goto err;
+
return 0;
err:
drm_dbg_kms(dev, "Failed to verify and init gem fb: %d\n", ret);