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authorThomas Zimmermann <tzimmermann@suse.de>2020-11-20 11:25:45 +0100
committerThomas Zimmermann <tzimmermann@suse.de>2020-11-24 09:31:34 +0100
commit32228ff5f7e1b1c8916e811d525b6e15e3d21b3d (patch)
tree3486e63ce0a5a94fa31b311a69e20da2220b71f2 /drivers/gpu/drm/drm_sysfs.c
parent7d4d269c0973f7a8324d9cd2534b3b24e62c72ff (diff)
drm/fb-helper: Acquire modeset lock around shadow-buffer flushing
Flushing the fbdev's shadow buffer requires vmap'ing the BO memory, which in turn requires pinning the BO. While being pinned, the BO cannot be moved into VRAM for scanout. Consequently, a concurrent modeset operation that involves the fbdev framebuffer would likely fail. Resolve this problem be acquiring the modeset lock of the planes that use the fbdev framebuffer. On non-atomic drivers, also acquire the mode-config lock. This serializes the flushing of the framebuffer with concurrent modeset operations. v2: * only acquire struct drm_fb_helper.lock in damage blitter (Daniel, Christian) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Maxime Ripard <mripard@kernel.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201120102545.4047-11-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/drm_sysfs.c')
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