From 73f460408ca9b6e917f32c89c9a85c586f17f732 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 4 Mar 2013 21:16:20 +0100 Subject: [PATCH] x86, quirks: Shut-up a long-standing gcc warning MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit So gcc nags about those since forever in randconfig builds. arch/x86/kernel/quirks.c: In function ‘ati_ixp4x0_rev’: arch/x86/kernel/quirks.c:361:4: warning: ‘b’ is used uninitialized in this function [-Wuninitialized] arch/x86/kernel/quirks.c: In function ‘ati_force_enable_hpet’: arch/x86/kernel/quirks.c:367:4: warning: ‘d’ may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/quirks.c:357:6: note: ‘d’ was declared here arch/x86/kernel/quirks.c:407:21: warning: ‘val’ may be used uninitialized in this function [-Wuninitialized] This function quirk is called on a SB400 chipset only anyway so the distant possibility of a PCI access failing becomes almost impossible there. Even if it did fail, then something else more serious is the problem. So zero-out the variables so that gcc shuts up but do a coarse check on the PCI accesses at the end and signal whether any of them had an error. They shouldn't but in case they do, we'll at least know and we can address it. Signed-off-by: Borislav Petkov Link: http://lkml.kernel.org/r/1362428180-8865-6-git-send-email-bp@alien8.de Signed-off-by: H. Peter Anvin --- arch/x86/kernel/quirks.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c index 26ee48a..04ee1e2 100644 --- a/arch/x86/kernel/quirks.c +++ b/arch/x86/kernel/quirks.c @@ -354,18 +354,22 @@ static void ati_force_hpet_resume(void) static u32 ati_ixp4x0_rev(struct pci_dev *dev) { - u32 d; - u8 b; + int err = 0; + u32 d = 0; + u8 b = 0; - pci_read_config_byte(dev, 0xac, &b); + err = pci_read_config_byte(dev, 0xac, &b); b &= ~(1<<5); - pci_write_config_byte(dev, 0xac, b); - pci_read_config_dword(dev, 0x70, &d); + err |= pci_write_config_byte(dev, 0xac, b); + err |= pci_read_config_dword(dev, 0x70, &d); d |= 1<<8; - pci_write_config_dword(dev, 0x70, d); - pci_read_config_dword(dev, 0x8, &d); + err |= pci_write_config_dword(dev, 0x70, d); + err |= pci_read_config_dword(dev, 0x8, &d); d &= 0xff; dev_printk(KERN_DEBUG, &dev->dev, "SB4X0 revision 0x%x\n", d); + + WARN_ON_ONCE(err); + return d; } -- 2.7.4