From 6ba7d63e018c6d777c9fe7afdf9719fcb220c31a Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Tue, 25 Jan 2022 18:13:10 +0100
Subject: [PATCH] tools: kwboot: Handle EINTR in kwboot_write()
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The write() syscall may be interrupted. Handle EINTR and retry it.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
---
 tools/kwboot.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/kwboot.c b/tools/kwboot.c
index de433c1b04..8b748f0fdd 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -292,13 +292,15 @@ static int blk_rsp_timeo = KWBOOT_BLK_RSP_TIMEO;
 static ssize_t
 kwboot_write(int fd, const char *buf, size_t len)
 {
-	size_t tot = 0;
+	ssize_t tot = 0;
 
 	while (tot < len) {
 		ssize_t wr = write(fd, buf + tot, len - tot);
 
-		if (wr < 0)
-			return -1;
+		if (wr < 0 && errno == EINTR)
+			continue;
+		else if (wr < 0)
+			return wr;
 
 		tot += wr;
 	}
-- 
2.39.5