6.6-stable review patch. If anyone has any objections, please let me know.
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From: Nam Cao namcao@linutronix.de
commit 33cd6ea9c0673517cdb06ad5c915c6f22e9615fc upstream.
When framebuffer gets closed, the queued deferred IO gets cancelled. This can cause some last display data to vanish. This is problematic for users who send a still image to the framebuffer, then close the file: the image may never appear.
To ensure none of display data get lost, flush the queued deferred IO first before closing.
Another possible solution is to delete the cancel_delayed_work_sync() instead. The difference is that the display may appear some time after closing. However, the clearing of page mapping after this needs to be removed too, because the page mapping is used by the deferred work. It is not completely obvious whether it is okay to not clear the page mapping. For a patch intended for stable trees, go with the simple and obvious solution.
Fixes: 60b59beafba8 ("fbdev: mm: Deferred IO support") Cc: stable@vger.kernel.org Signed-off-by: Nam Cao namcao@linutronix.de Reviewed-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/fbdev/core/fb_defio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -313,7 +313,7 @@ static void fb_deferred_io_lastclose(str struct page *page; int i;
- cancel_delayed_work_sync(&info->deferred_work); + flush_delayed_work(&info->deferred_work);
/* clear out the mapping that we setup */ for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {