This is a note to let you know that I've just added the patch titled
fbdev: Fix incorrect page mapping clearance at fb_deferred_io_release()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fbdev-fix-incorrect-page-mapping-clearance-at-fb_def.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a67b59a0fe2dacc469e88dc08601e15ae362002a
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed Mar 8 11:50:12 2023 +0100
fbdev: Fix incorrect page mapping clearance at fb_deferred_io_release()
[ Upstream commit fe9ae05cfbe587dda724fcf537c00bc2f287da62 ]
The recent fix for the deferred I/O by the commit
3efc61d95259 ("fbdev: Fix invalid page access after closing deferred I/O devices")
caused a regression when the same fb device is opened/closed while
it's being used. It resulted in a frozen screen even if something
is redrawn there after the close. The breakage is because the patch
was made under a wrong assumption of a single open; in the current
code, fb_deferred_io_release() cleans up the page mapping of the
pageref list and it calls cancel_delayed_work_sync() unconditionally,
where both are no correct behavior for multiple opens.
This patch adds a refcount for the opens of the device, and applies
the cleanup only when all files get closed.
As both fb_deferred_io_open() and _close() are called always in the
fb_info lock (mutex), it's safe to use the normal int for the
refcounting.
Also, a useless BUG_ON() is dropped.
Fixes: 3efc61d95259 ("fbdev: Fix invalid page access after closing deferred I/O devices")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230308105012.1845-1-tiwai@xxxxxxx
Stable-dep-of: 33cd6ea9c067 ("fbdev: flush deferred IO before closing")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index b3f41f432ec2..7e76e53b83d5 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -288,17 +288,18 @@ void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file)
{
+ struct fb_deferred_io *fbdefio = info->fbdefio;
+
file->f_mapping->a_ops = &fb_deferred_io_aops;
+ fbdefio->open_count++;
}
EXPORT_SYMBOL_GPL(fb_deferred_io_open);
-void fb_deferred_io_release(struct fb_info *info)
+static void fb_deferred_io_lastclose(struct fb_info *info)
{
- struct fb_deferred_io *fbdefio = info->fbdefio;
struct page *page;
int i;
- BUG_ON(!fbdefio);
cancel_delayed_work_sync(&info->deferred_work);
/* clear out the mapping that we setup */
@@ -307,13 +308,21 @@ void fb_deferred_io_release(struct fb_info *info)
page->mapping = NULL;
}
}
+
+void fb_deferred_io_release(struct fb_info *info)
+{
+ struct fb_deferred_io *fbdefio = info->fbdefio;
+
+ if (!--fbdefio->open_count)
+ fb_deferred_io_lastclose(info);
+}
EXPORT_SYMBOL_GPL(fb_deferred_io_release);
void fb_deferred_io_cleanup(struct fb_info *info)
{
struct fb_deferred_io *fbdefio = info->fbdefio;
- fb_deferred_io_release(info);
+ fb_deferred_io_lastclose(info);
kvfree(info->pagerefs);
mutex_destroy(&fbdefio->lock);
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 433cddf8442b..b79a833524ef 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -212,6 +212,7 @@ struct fb_deferred_io {
/* delay between mkwrite and deferred handler */
unsigned long delay;
bool sort_pagereflist; /* sort pagelist by offset */
+ int open_count; /* number of opened files; protected by fb_info lock */
struct mutex lock; /* mutex that protects the pageref list */
struct list_head pagereflist; /* list of pagerefs for touched pages */
/* callback */
