Commit 25000c2c authored by Alan Cox's avatar Alan Cox Committed by Bartlomiej Zolnierkiewicz
Browse files

[PATCH] ide: explain the PCI bus test we do in <asm-i386/ide.h> 



Matthew Wilcox asked that this got a comment explaining why it is done
so here it is.

Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent f5b2d8b4

include/asm-i386/ide.h

+6 −0
Original line number Diff line number Diff line
@@ -41,6 +41,12 @@ static __inline__ int ide_default_irq(unsigned long base) 


static __inline__ unsigned long ide_default_io_base(int index)

{

	/*

	 *	If PCI is present then it is not safe to poke around

	 *	the other legacy IDE ports. Only 0x1f0 and 0x170 are

	 *	defined compatibility mode ports for PCI. A user can 

	 *	override this using ide= but we must default safe.

	 */

	if (pci_find_device(PCI_ANY_ID, PCI_ANY_ID, NULL) == NULL) {

		switch(index) {

			case 2: return 0x1e8;