From: Jens Axboe <axboe@suse.de>
Date: Sun, 1 May 2005 19:12:52 +0000 (-0700)
Subject: [PATCH] Avoid unnecessary ide-cd cache flushes
X-Git-Tag: firefly_0821_release~42725^2~75
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7da21a02b3587157bd43910ea6d4c76661228ebb;p=firefly-linux-kernel-4.4.55.git

[PATCH] Avoid unnecessary ide-cd cache flushes

Only issue a cdrom cache flush if we've done write to the drive.  The
->media_written() flag keeps track of that.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 9deca49c71f0..beaa561f2ed8 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -645,7 +645,7 @@ static int cdrom_mrw_exit(struct cdrom_device_info *cdi)
 		ret = cdrom_mrw_bgformat_susp(cdi, 0);
 	}
 
-	if (!ret)
+	if (!ret && cdi->media_written)
 		ret = cdrom_flush_cache(cdi);
 
 	return ret;