linux-kernel - [PATCH 4/5] s390/pci: Move an assignment for the variable "ret" in s390_pci_mmio

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Date:   Sat, 21 Jan 2017 19:13:33 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-s390@...r.kernel.org,
        Gerald Schäfer <gerald.schaefer@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sebastian Ott <sebott@...ux.vnet.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 4/5] s390/pci: Move an assignment for the variable "ret" in
 s390_pci_mmio_write()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 21 Jan 2017 18:35:00 +0100

A local variable was set to an error code before a concrete error situation
was detected. Thus move the corresponding assignment into an if branch
to indicate a software failure there.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/s390/pci/pci_mmio.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/s390/pci/pci_mmio.c b/arch/s390/pci/pci_mmio.c
index b1bb2b72302c..f125858a77e9 100644
--- a/arch/s390/pci/pci_mmio.c
+++ b/arch/s390/pci/pci_mmio.c
@@ -57,12 +57,11 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
 		goto out;
 	io_addr = (void __iomem *)((pfn << PAGE_SHIFT) | (mmio_addr & ~PAGE_MASK));
 
-	ret = -EFAULT;
-	if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE)
-		goto out;
-
-	if (copy_from_user(buf, user_buffer, length))
+	if ((unsigned long)io_addr < ZPCI_IOMAP_ADDR_BASE ||
+	    copy_from_user(buf, user_buffer, length)) {
+		ret = -EFAULT;
 		goto out;
+	}
 
 	ret = zpci_memcpy_toio(io_addr, buf, length);
 out:
-- 
2.11.0