diff options
| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2017-08-13 23:14:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 09:20:07 +0200 |
| commit | cd4fdbb85e7fa74ea88f2db949ceb65f0aa8295b (patch) | |
| tree | b469ecaaa4473e822fe6cefcf7adabdb0429b7fe | |
| parent | 7fb227e97df9793c9d7b32962077bb3031cdb85c (diff) | |
sparc: kernel/pcic: silence gcc 7.x warning in pcibios_fixup_bus()
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 <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/sparc/kernel/pcic.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |