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watchdog: sp5100_tco: Fix wrong indirect I/O access for getting value of reserved bits 

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 <mc74hc00@gmail.com>
Tested-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: stable <stable@vger.kernel.org>
This commit is contained in:
Takahisa Tanaka 2013-01-14 11:01:57 +09:00 committed by Wim Van Sebroeck
parent 6737176569
commit 10ab329b5d
1 changed files with 3 additions and 2 deletions
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5
drivers/watchdog/sp5100_tco.c
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@ -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);