poky/meta/recipes-devtools/mtools/mtools/0001-remove-LOCK_NB-to-use-blocking-request.patch

From 5bdbfe0a63fed48104b17412854b26ee2275869a Mon Sep 17 00:00:00 2001
From: Hongxu Jia <hongxu.jia@windriver.com>
Date: Wed, 22 Aug 2018 16:54:39 +0800
Subject: [PATCH] remove LOCK_NB to use blocking request

While invoking mtools frequently, the unblocking request
caused race issue. Here is an example of syslinux
[snip]
dd if=/dev/zero of=floppy.img bs=1024 count=144
losetup /dev/loop1 floppy.img
mkdosfs /dev/loop1
syslinux -i /dev/loop1
|plain floppy: device "/proc/6351/fd/3" busy (Resource temporarily unavailable):
|Cannot initialize 'S:'
|Bad target s:/ldlinux.sys
[snip]

The idea is from:
https://bugzilla.redhat.com/show_bug.cgi?id=1235016
https://groups.google.com/a/chromium.org/forum/#!msg/chromium-os-dev/bRPUCFHoBTQ/ZjB8kjjx1vUJ

Upstream-Status: Pending

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
 lockdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lockdev.h b/lockdev.h
index 4467bc2..5a135ad 100644
--- a/lockdev.h
+++ b/lockdev.h
@@ -43,7 +43,7 @@ int lock_dev(int fd, int mode, struct device *dev)
 		return 0;
 
 #if (defined(HAVE_FLOCK) && defined (LOCK_EX) && defined(LOCK_NB))
-	if (flock(fd, (mode ? LOCK_EX : LOCK_SH)|LOCK_NB) < 0)
+	if (flock(fd, (mode ? LOCK_EX : LOCK_SH)) < 0)
 #else /* FLOCK */
 
 #if (defined(HAVE_LOCKF) && defined(F_TLOCK))
-- 
2.7.4