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Revert "drm/fb-helper: Schedule deferred-I/O worker after writing to framebuffer" 

This reverts commit 7f5cc4a3e5.

Needed to restore the fbdev damage worker. There have been bug reports
about locking order [1] and incorrectly takens branches. [2] Restore
the damage worker until these problems have been resovled.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://intel-gfx-ci.01.org/tree/drm-tip/fi-kbl-8809g.html # 1
Link: https://lore.kernel.org/dri-devel/20221115115819.23088-6-tzimmermann@suse.de/T/#m06eedc0a468940e4cbbd14ca026733b639bc445a # 2
Link: https://patchwork.freedesktop.org/patch/msgid/20221118133535.9739-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-11-18 14:35:34 +01:00
parent 7aa3d63e1a
commit 8b83e1a455
3 changed files with 1 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/drm_fb_helper.c
View File

@ -599,16 +599,9 @@ static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u
static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
u32 width, u32 height)
{
struct fb_info *info = helper->info;
drm_fb_helper_add_damage_clip(helper, x, y, width, height);
/*
* The current fbdev emulation only flushes buffers if a damage
* update is necessary. And we can assume that deferred I/O has
* been enabled as damage updates require deferred I/O for mmap.
*/
fb_deferred_io_schedule_flush(info);
schedule_work(&helper->damage_work);
}
/*

16
drivers/video/fbdev/core/fb_defio.c
View File

@ -332,19 +332,3 @@ void fb_deferred_io_cleanup(struct fb_info *info)
mutex_destroy(&fbdefio->lock);
}
EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);
void fb_deferred_io_schedule_flush(struct fb_info *info)
{
struct fb_deferred_io *fbdefio = info->fbdefio;
if (WARN_ON_ONCE(!fbdefio))
return; /* bug in driver logic */
/*
* There's no requirement from callers to schedule the
* flush immediately. Rather schedule the worker with a
* delay and let a few more writes pile up.
*/
schedule_delayed_work(&info->deferred_work, fbdefio->delay);
}
EXPORT_SYMBOL_GPL(fb_deferred_io_schedule_flush);

1
include/linux/fb.h
View File

@ -663,7 +663,6 @@ extern void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file);
extern void fb_deferred_io_cleanup(struct fb_info *info);
extern void fb_deferred_io_schedule_flush(struct fb_info *info);
extern int fb_deferred_io_fsync(struct file *file, loff_t start,
loff_t end, int datasync);