linux-kernel - [PATCH] PCI: mvebu: Fix uninitialized variable in mvebu_get_tgt

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Date:	Fri,  8 Aug 2014 17:34:05 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] PCI: mvebu: Fix uninitialized variable in mvebu_get_tgt_attr()

drivers/pci/host/pci-mvebu.c: In function 'mvebu_get_tgt_attr':
drivers/pci/host/pci-mvebu.c:887:39: warning: 'rtype' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (slot == PCI_SLOT(devfn) && type == rtype) {
                                       ^

If there's ever gonna be a configuration space or 64-bit memory space
entry in DT, rtype will be uninitialized, and the wrong entry may be
returned.

Initialize rtype to 0 (which is an unused IORESOURCE_* type) to fix this.

Introduced in commit 11be65472a427dcf7a11ab6e3e3628f1c6768b5b ("PCI:
mvebu: Adapt to the new device tree layout").

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Alternatively, should the "else if (DT_FLAGS_TO_TYPE(flags) ==
DT_TYPE_MEM32)" just be changed to "else", assuming there can never be
other entries than for I/O or 32-bit memory space?
---
 drivers/pci/host/pci-mvebu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index ce23e0f076b6..9515f0d13fd4 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -877,7 +877,7 @@ static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
 		u32 flags = of_read_number(range, 1);
 		u32 slot = of_read_number(range + 1, 1);
 		u64 cpuaddr = of_read_number(range + na, pna);
-		unsigned long rtype;
+		unsigned long rtype = 0;
 
 		if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
 			rtype = IORESOURCE_IO;
-- 
1.9.1

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