linux-kernel - [PATCH 4.9 120/222] misc: kgdbts: Fix restrict error

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Message-Id: <20191122100911.777591688@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:27:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laura Abbott <labbott@...hat.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 120/222] misc: kgdbts: Fix restrict error

From: Laura Abbott <labbott@...hat.com>

[ Upstream commit fa0218ef733e6f247a1a3986e3eb12460064ac77 ]

kgdbts current fails when compiled with restrict:

drivers/misc/kgdbts.c: In function ‘configure_kgdbts’:
drivers/misc/kgdbts.c:1070:2: error: ‘strcpy’ source argument is the same as destination [-Werror=restrict]
  strcpy(config, opt);
  ^~~~~~~~~~~~~~~~~~~

As the error says, config is being used in both the source and destination.
Refactor the code to avoid the extra copy and put the parsing closer to
the actual location.

Signed-off-by: Laura Abbott <labbott@...hat.com>
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/misc/kgdbts.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index bb3a76ad80da2..fc8cb855c6e66 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -979,6 +979,12 @@ static void kgdbts_run_tests(void)
 	int nmi_sleep = 0;
 	int i;
 
+	verbose = 0;
+	if (strstr(config, "V1"))
+		verbose = 1;
+	if (strstr(config, "V2"))
+		verbose = 2;
+
 	ptr = strchr(config, 'F');
 	if (ptr)
 		fork_test = simple_strtol(ptr + 1, NULL, 10);
@@ -1062,13 +1068,6 @@ static int kgdbts_option_setup(char *opt)
 		return -ENOSPC;
 	}
 	strcpy(config, opt);
-
-	verbose = 0;
-	if (strstr(config, "V1"))
-		verbose = 1;
-	if (strstr(config, "V2"))
-		verbose = 2;
-
 	return 0;
 }
 
@@ -1080,9 +1079,6 @@ static int configure_kgdbts(void)
 
 	if (!strlen(config) || isspace(config[0]))
 		goto noconfig;
-	err = kgdbts_option_setup(config);
-	if (err)
-		goto noconfig;
 
 	final_ack = 0;
 	run_plant_and_detach_test(1);
-- 
2.20.1