linux-kernel - [PATCH 10/16] MIPS: lantiq: falcon: sysctrl: fix request memory check logic

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Message-ID:
 <OSBPR01MB167032C73DD1EBE50D0D1263BC72A@OSBPR01MB1670.jpnprd01.prod.outlook.com>
Date: Wed, 18 Jun 2025 22:53:23 +0800
From: Shiji Yang <yangshiji66@...look.com>
To: linux-mips@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-spi@...r.kernel.org
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	John Crispin <john@...ozen.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org,
	Shiji Yang <yangshiji66@...look.com>
Subject: [PATCH 10/16] MIPS: lantiq: falcon: sysctrl: fix request memory check logic

request_mem_region() will return NULL instead of error code
when the memory request fails. Therefore, we should check if
the return value is non-zero instead of less than zero. In
this way, this patch also fixes the build warnings:

arch/mips/lantiq/falcon/sysctrl.c:214:50: error: ordered comparison of pointer with integer zero [-Werror=extra]
  214 |                                 res_status.name) < 0) ||
      |                                                  ^
arch/mips/lantiq/falcon/sysctrl.c:216:47: error: ordered comparison of pointer with integer zero [-Werror=extra]
  216 |                                 res_ebu.name) < 0) ||
      |                                               ^
arch/mips/lantiq/falcon/sysctrl.c:219:50: error: ordered comparison of pointer with integer zero [-Werror=extra]
  219 |                                 res_sys[0].name) < 0) ||
      |                                                  ^
arch/mips/lantiq/falcon/sysctrl.c:222:50: error: ordered comparison of pointer with integer zero [-Werror=extra]
  222 |                                 res_sys[1].name) < 0) ||
      |                                                  ^
arch/mips/lantiq/falcon/sysctrl.c:225:50: error: ordered comparison of pointer with integer zero [-Werror=extra]
  225 |                                 res_sys[2].name) < 0))
      |

Signed-off-by: Shiji Yang <yangshiji66@...look.com>
---
 arch/mips/lantiq/falcon/sysctrl.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/arch/mips/lantiq/falcon/sysctrl.c b/arch/mips/lantiq/falcon/sysctrl.c
index 9a8616c36..577e6e630 100644
--- a/arch/mips/lantiq/falcon/sysctrl.c
+++ b/arch/mips/lantiq/falcon/sysctrl.c
@@ -210,19 +210,16 @@ void __init ltq_soc_init(void)
 	of_node_put(np_syseth);
 	of_node_put(np_sysgpe);
 
-	if ((request_mem_region(res_status.start, resource_size(&res_status),
-				res_status.name) < 0) ||
-		(request_mem_region(res_ebu.start, resource_size(&res_ebu),
-				res_ebu.name) < 0) ||
-		(request_mem_region(res_sys[0].start,
-				resource_size(&res_sys[0]),
-				res_sys[0].name) < 0) ||
-		(request_mem_region(res_sys[1].start,
-				resource_size(&res_sys[1]),
-				res_sys[1].name) < 0) ||
-		(request_mem_region(res_sys[2].start,
-				resource_size(&res_sys[2]),
-				res_sys[2].name) < 0))
+	if ((!request_mem_region(res_status.start, resource_size(&res_status),
+				 res_status.name)) ||
+	    (!request_mem_region(res_ebu.start, resource_size(&res_ebu),
+				 res_ebu.name)) ||
+	    (!request_mem_region(res_sys[0].start, resource_size(&res_sys[0]),
+				 res_sys[0].name)) ||
+	    (!request_mem_region(res_sys[1].start, resource_size(&res_sys[1]),
+				 res_sys[1].name)) ||
+	    (!request_mem_region(res_sys[2].start, resource_size(&res_sys[2]),
+				 res_sys[2].name)))
 		pr_err("Failed to request core resources");
 
 	status_membase = ioremap(res_status.start,
-- 
2.50.0