From cc3edac76f8f5e8b0217874f80c0cb6b0774ee7a Mon Sep 17 00:00:00 2001 From: Takahisa Tanaka Date: Mon, 14 Jan 2013 11:01:57 +0900 Subject: watchdog: sp5100_tco: Fix wrong indirect I/O access for getting value of reserved bits commit 10ab329b5db7e592a3a60b4594e4e5f40b60c45c upstream. In case of SB800 or later chipset and re-programming MMIO address(*), sp5100_tco module may read incorrect value of reserved bit, because the module reads a value from an incorrect I/O address. However, this bug doesn't cause a problem, because when re-programming MMIO address, by chance the module writes zero (this is BIOS's default value) to the low three bits of register. * In most cases, PC with SB8x0 or later chipset doesn't need to re-programming MMIO address, because such PC can enable AcpiMmio and can use 0xfed80b00 for watchdog register base address. This patch fixes this bug. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176 Signed-off-by: Takahisa Tanaka Tested-by: Paul Menzel Signed-off-by: Wim Van Sebroeck Signed-off-by: Greg Kroah-Hartman --- drivers/watchdog/sp5100_tco.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/watchdog') diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c index 2b0e000d4377..5dfe86ebdc8b 100644 --- a/drivers/watchdog/sp5100_tco.c +++ b/drivers/watchdog/sp5100_tco.c @@ -500,14 +500,15 @@ static unsigned char sp5100_tco_setupdevice(void) /* Restore to the low three bits, if chipset is SB8x0(or later) */ if (sp5100_tco_pci->revision >= 0x40) { u8 reserved_bit; - reserved_bit = inb(base_addr) & 0x7; + outb(base_addr+0, index_reg); + reserved_bit = inb(data_reg) & 0x7; val |= (u32)reserved_bit; } /* Re-programming the watchdog timer base address */ outb(base_addr+0, index_reg); /* Low three bits of BASE are reserved */ - outb((val >> 0) & 0xf8, data_reg); + outb((val >> 0) & 0xff, data_reg); outb(base_addr+1, index_reg); outb((val >> 8) & 0xff, data_reg); outb(base_addr+2, index_reg); -- cgit v1.2.3