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ide: skip ide_wait_not_busy() on noprobe-disks

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There is a problem in some hardware where the kernel will stall for
35 seconds waiting for disks that don't exist. This patch will skip
waiting for the BSY-bit on IDE drives to go away if you set "hdx=noprobe"
as a kernel option and the disk is not marked as 'present' (like when
you set the geometry by hand).

If no noprobe-option is set the code will work (more or less) as the
original but if set the code will skip the ide_wait_not_busy() for
that drive. Even if there would be a drive there and it is still busy
afterwards it should not matter since it isn't probed for later.

The code also honors the MAX_DRIVES variable instead of assuming that
there will be two harddrives on the bus.

Bart: minor cleanups

Signed-off-by: Jonas Stare <jonas.stare@purplescout.se>
CC: Andrew Morton <akpm@linux-foundation.org>,
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Jonas Stare 2007-11-27 21:35:53 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 8ac98ce17c
commit 8266105b15
1 changed files with 19 additions and 13 deletions
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32
drivers/ide/ide-probe.c
View file

@ -644,7 +644,7 @@ static void hwif_register (ide_hwif_t *hwif)
static int wait_hwif_ready(ide_hwif_t *hwif)
{
int rc;
int unit, rc;
printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
@ -661,20 +661,26 @@ static int wait_hwif_ready(ide_hwif_t *hwif)
return rc;
/* Now make sure both master & slave are ready */
SELECT_DRIVE(&hwif->drives[0]);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
if (rc)
return rc;
SELECT_DRIVE(&hwif->drives[1]);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
for (unit = 0; unit < MAX_DRIVES; unit++) {
ide_drive_t *drive = &hwif->drives[unit];
/* Ignore disks that we will not probe for later. */
if (!drive->noprobe || drive->present) {
SELECT_DRIVE(drive);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
if (rc)
goto out;
} else
printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
drive->name);
}
out:
/* Exit function with master reselected (let's be sane) */
SELECT_DRIVE(&hwif->drives[0]);
if (unit)
SELECT_DRIVE(&hwif->drives[0]);
return rc;
}