linux-kernel - [PATCH 2/5] powerpc-MSI: Use kmalloc_array() in ppc4xx_setup_msi

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Message-ID: <01cf542d-c65e-ff66-6fb0-5ce75af184de@users.sourceforge.net>
Date:   Mon, 29 Aug 2016 13:09:08 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linuxppc-dev@...ts.ozlabs.org,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <scottwood@...escale.com>,
        Sudeep Holla <Sudeep.Holla@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 2/5] powerpc-MSI: Use kmalloc_array() in
 ppc4xx_setup_msi_irqs()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 29 Aug 2016 11:11:24 +0200

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data type by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/powerpc/sysdev/ppc4xx_msi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/ppc4xx_msi.c b/arch/powerpc/sysdev/ppc4xx_msi.c
index 8fb8061..0bd5e4b 100644
--- a/arch/powerpc/sysdev/ppc4xx_msi.c
+++ b/arch/powerpc/sysdev/ppc4xx_msi.c
@@ -89,7 +89,9 @@ static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	if (type == PCI_CAP_ID_MSIX)
 		pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n");
 
-	msi_data->msi_virqs = kmalloc((msi_irqs) * sizeof(int), GFP_KERNEL);
+	msi_data->msi_virqs = kmalloc_array(msi_irqs,
+					    sizeof(*msi_data->msi_virqs),
+					    GFP_KERNEL);
 	if (!msi_data->msi_virqs)
 		return -ENOMEM;
 
-- 
2.9.3