linux-kernel - [PATCH 17/30] pci: Use kmemdup rather than duplicating its implementation

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Message-Id: <20190703131627.25455-1-huangfq.daxian@gmail.com>
Date:   Wed,  3 Jul 2019 21:16:27 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH 17/30] pci: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memset, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memset.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 drivers/pci/hotplug/ibmphp_core.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
index 17124254d897..0e340e105c3b 100644
--- a/drivers/pci/hotplug/ibmphp_core.c
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -1261,19 +1261,18 @@ static int __init ibmphp_init(void)
 
 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
-	ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
-	if (!ibmphp_pci_bus) {
-		rc = -ENOMEM;
-		goto exit;
-	}
-
 	bus = pci_find_bus(0, 0);
 	if (!bus) {
 		err("Can't find the root pci bus, can not continue\n");
 		rc = -ENODEV;
 		goto error;
 	}
-	memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
+
+	ibmphp_pci_bus = kmemdup(bus, sizeof(*ibmphp_pci_bus), GFP_KERNEL);
+	if (!ibmphp_pci_bus) {
+		rc = -ENOMEM;
+		goto exit;
+	}
 
 	ibmphp_debug = debug;
 
-- 
2.11.0