Hi,
On 5/9/22 13:52, Javier Martinez Canillas wrote:
> Hello Hans,
>
> On 5/9/22 13:04, Hans de Goede wrote:
>> vmw_fb_kms_framebuffer() declares a drm_mode_fb_cmd2 struct on the stack
>> without zero-ing it and then continues with initializing only some fields.
>>
>> This leads to drm_mode_fb_cmd2.modifiers[0] containing garbage,
>> which eventually gets used by drm_helper_mode_fill_fb_struct() to
>> set fb->modifier when leads to the following atomic-check failure:
>>
>> vmwgfx 0000:00:02.0: [drm:drm_atomic_check_only] [PLANE:34:plane-0]
>> invalid pixel format XR24 little-endian (0x34325258),
>> modifier 0xffff94d64719e000
>> fbcon_init: detected unhandled fb_set_par error, error code -22
>>
>> Which causes the fbdev emulation and thus also fbcon to not work.
>>
>> Initialize the struct with all zeros to fix this.
>>
>> Fixes: dabdcdc9822a ("drm/vmwgfx: Switch to mode_cmd2")
>> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2072556
>> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
>> ---
>
> Zack fixed this already:
>
> https://cgit.freedesktop.org/drm/drm-misc/commit/?id=5405d25b9e8e6
I see, but it seems that this was never pushed to drm-misc-fixes,
so this is still broken in 5.18-rc#
Regards,
Hans
