linux-kernel - [PATCH 4.4 178/188] um: fix error return code in winch

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Message-Id: <20210719144942.309325990@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:52:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        anton.ivanov@...bridgegreys.com,
        Richard Weinberger <richard@....at>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 178/188] um: fix error return code in winch_tramp()

From: Zhen Lei <thunder.leizhen@...wei.com>

[ Upstream commit ccf1236ecac476d9d2704866d9a476c86e387971 ]

Fix to return a negative error code from the error handling case instead
of 0, as done elsewhere in this function.

Fixes: 89df6bfc0405 ("uml: DEBUG_SHIRQ fixes")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Acked-By: anton.ivanov@...bridgegreys.com
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/um/drivers/chan_user.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 3fd7c3efdb18..feb7f5ab4084 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -256,7 +256,8 @@ static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 		goto out_close;
 	}
 
-	if (os_set_fd_block(*fd_out, 0)) {
+	err = os_set_fd_block(*fd_out, 0);
+	if (err) {
 		printk(UM_KERN_ERR "winch_tramp: failed to set thread_fd "
 		       "non-blocking.\n");
 		goto out_close;
-- 
2.30.2