linux-kernel - [PATCH v2 1/3] fbdev: Remove unused struct fb_deferred_io .first

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Date:   Sat, 21 Jan 2023 20:24:16 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Noralf Trønnes <noralf@...nnes.org>,
        Maxime Ripard <mripard@...nel.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        Jaya Kumar <jayalk@...works.biz>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org
Subject: [PATCH v2 1/3] fbdev: Remove unused struct fb_deferred_io .first_io field

This optional callback was added in the commit 1f45f9dbb392 ("fb_defio:
add first_io callback") but it was never used by a driver. Let's remove
it since it's unlikely that will be used after a decade that was added.

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
---

(no changes since v1)

 drivers/video/fbdev/core/fb_defio.c | 4 ----
 include/linux/fb.h                  | 1 -
 2 files changed, 5 deletions(-)

diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index c730253ab85c..1b680742b7f3 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -157,10 +157,6 @@ static vm_fault_t fb_deferred_io_track_page(struct fb_info *info, unsigned long
 	/* protect against the workqueue changing the page list */
 	mutex_lock(&fbdefio->lock);
 
-	/* first write in this cycle, notify the driver */
-	if (fbdefio->first_io && list_empty(&fbdefio->pagereflist))
-		fbdefio->first_io(info);
-
 	pageref = fb_deferred_io_pageref_get(info, offset, page);
 	if (WARN_ON_ONCE(!pageref)) {
 		ret = VM_FAULT_OOM;
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 30183fd259ae..daf336385613 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -215,7 +215,6 @@ struct fb_deferred_io {
 	struct mutex lock; /* mutex that protects the pageref list */
 	struct list_head pagereflist; /* list of pagerefs for touched pages */
 	/* callback */
-	void (*first_io)(struct fb_info *info);
 	void (*deferred_io)(struct fb_info *info, struct list_head *pagelist);
 };
 #endif
-- 
2.39.0