linux-kernel - [PATCH] staging: fieldbus: anybus-s: fix wait_for_completion

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Message-Id: <20190501143812.7672-1-TheSven73@gmail.com>
Date:   Wed,  1 May 2019 10:38:12 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] staging: fieldbus: anybus-s: fix wait_for_completion_timeout return handling

From: Nicholas Mc Guire <hofrat@...dl.org>

wait_for_completion_timeout() returns unsigned long (0 on timeout or
remaining jiffies) not int. Assigning this return value to int may
theoretically overflow (though not in this case where TIMEOUT is
only HZ*2).

Fix this inconsistency by wrapping the wait_for_completion_timeout
into the if().

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Reviewed-by: Sven Van Asbroeck <TheSven73@...il.com>
---
 drivers/staging/fieldbus/anybuss/host.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fieldbus/anybuss/host.c b/drivers/staging/fieldbus/anybuss/host.c
index e34d4249f5a7..a64fe03b61fa 100644
--- a/drivers/staging/fieldbus/anybuss/host.c
+++ b/drivers/staging/fieldbus/anybuss/host.c
@@ -1325,11 +1325,10 @@ anybuss_host_common_probe(struct device *dev,
 	 *   interrupt came in: ready to go !
 	 */
 	reset_deassert(cd);
-	ret = wait_for_completion_timeout(&cd->card_boot, TIMEOUT);
-	if (ret == 0)
+	if (!wait_for_completion_timeout(&cd->card_boot, TIMEOUT)) {
 		ret = -ETIMEDOUT;
-	if (ret < 0)
 		goto err_reset;
+	}
 	/*
 	 * according to the anybus docs, we're allowed to read these
 	 * without handshaking / reserving the area
-- 
2.17.1