From cd4fdbb85e7fa74ea88f2db949ceb65f0aa8295b Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Sun, 13 Aug 2017 23:14:58 +0200 Subject: [PATCH] sparc: kernel/pcic: silence gcc 7.x warning in pcibios_fixup_bus() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 2dc77533f1e495788d73ffa4bee4323b2646d2bb upstream. When building the kernel for Sparc using gcc 7.x, the build fails with: arch/sparc/kernel/pcic.c: In function ‘pcibios_fixup_bus’: arch/sparc/kernel/pcic.c:647:8: error: ‘cmd’ may be used uninitialized in this function [-Werror=maybe-uninitialized] cmd |= PCI_COMMAND_IO; ^~ The simplified code looks like this: unsigned int cmd; [...] pcic_read_config(dev->bus, dev->devfn, PCI_COMMAND, 2, &cmd); [...] cmd |= PCI_COMMAND_IO; I.e, the code assumes that pcic_read_config() will always initialize cmd. But it's not the case. Looking at pcic_read_config(), if bus->number is != 0 or if the size is not one of 1, 2 or 4, *val will not be initialized. As a simple fix, we initialize cmd to zero at the beginning of pcibios_fixup_bus. Signed-off-by: Thomas Petazzoni Signed-off-by: David S. Miller Cc: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- arch/sparc/kernel/pcic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c index 24384e1dc33d..a7aeb036b070 100644 --- a/arch/sparc/kernel/pcic.c +++ b/arch/sparc/kernel/pcic.c @@ -602,7 +602,7 @@ void pcibios_fixup_bus(struct pci_bus *bus) { struct pci_dev *dev; int i, has_io, has_mem; - unsigned int cmd; + unsigned int cmd = 0; struct linux_pcic *pcic; /* struct linux_pbm_info* pbm = &pcic->pbm; */ int node; -- 2.20.1