linux-kernel - [PATCH] powerpc/powernv: move the dereference below the NULL test

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Date:	Fri, 7 Sep 2012 14:45:55 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	benh@...nel.crashing.org, paulus@...ba.org,
	grant.likely@...retlab.ca, rob.herring@...xeda.com
Cc:	yongjun_wei@...ndmicro.com.cn, linuxppc-dev@...ts.ozlabs.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/powernv: move the dereference below the NULL test

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

The dereference should be moved below the NULL test.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 arch/powerpc/platforms/powernv/pci.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index be3cfc5..4ba89c1 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -287,13 +287,15 @@ static int pnv_pci_read_config(struct pci_bus *bus,
 			       int where, int size, u32 *val)
 {
 	struct pci_controller *hose = pci_bus_to_host(bus);
-	struct pnv_phb *phb = hose->private_data;
+	struct pnv_phb *phb;
 	u32 bdfn = (((uint64_t)bus->number) << 8) | devfn;
 	s64 rc;
 
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
+	phb = hose->private_data;
+
 	switch (size) {
 	case 1: {
 		u8 v8;
@@ -331,12 +333,14 @@ static int pnv_pci_write_config(struct pci_bus *bus,
 				int where, int size, u32 val)
 {
 	struct pci_controller *hose = pci_bus_to_host(bus);
-	struct pnv_phb *phb = hose->private_data;
+	struct pnv_phb *phb;
 	u32 bdfn = (((uint64_t)bus->number) << 8) | devfn;
 
 	if (hose == NULL)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
+	phb = hose->private_data;
+
 	cfg_dbg("pnv_pci_write_config bus: %x devfn: %x +%x/%x -> %08x\n",
 		bus->number, devfn, where, size, val);
 	switch (size) {

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