renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-21 03:33:59 +08:00
Code

x86/PCI: fixup early quirk probing

Browse Source 
On x86, we do early PCI probing to apply some quirks for chipset bugs.
However, in a recent cleanup (7bcbc78dea) a
thinko was introduced that causes us to probe all subfunctions of even single
function devices (a function was factored out of an inner loop and a "break"
became a "return").  Fix that up by making check_dev_quirk() return a value so
we can keep the factored code intact.

Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jesse Barnes 2008-06-16 15:29:45 -07:00 committed by Jesse Barnes
parent d8f3de0d24
commit 15650a2f64
1 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/x86/kernel/early-quirks.c
View File

@ -133,7 +133,18 @@ static struct chipset early_qrk[] __initdata = {
{}
};
static void __init check_dev_quirk(int num, int slot, int func)
/**
* check_dev_quirk - apply early quirks to a given PCI device
* @num: bus number
* @slot: slot number
* @func: PCI function
*
* Check the vendor & device ID against the early quirks table.
*
* If the device is single function, let early_quirks() know so we don't
* poke at this device again.
*/
static int __init check_dev_quirk(int num, int slot, int func)
{
u16 class;
u16 vendor;
@ -144,7 +155,7 @@ static void __init check_dev_quirk(int num, int slot, int func)
class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
if (class == 0xffff)
return;
return -1; /* no class, treat as single function */
vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
@ -167,7 +178,9 @@ static void __init check_dev_quirk(int num, int slot, int func)
type = read_pci_config_byte(num, slot, func,
PCI_HEADER_TYPE);
if (!(type & 0x80))
return;
return -1;
return 0;
}
void __init early_quirks(void)
@ -180,6 +193,9 @@ void __init early_quirks(void)
/* Poor man's PCI discovery */
for (num = 0; num < 32; num++)
for (slot = 0; slot < 32; slot++)
for (func = 0; func < 8; func++)
check_dev_quirk(num, slot, func);
for (func = 0; func < 8; func++) {
/* Only probe function 0 on single fn devices */
if (check_dev_quirk(num, slot, func))
break;
}
}