From: Jonas Stare Date: Tue, 27 Nov 2007 20:35:53 +0000 (+0100) Subject: ide: skip ide_wait_not_busy() on noprobe-disks X-Git-Tag: v2.6.24-rc4~85^2~16 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8266105b15192177ac732ab8a27b315dc9291100;p=linux-2.6 ide: skip ide_wait_not_busy() on noprobe-disks 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 CC: Andrew Morton , Cc: Linus Torvalds Cc: Alan Cox Cc: Benjamin Herrenschmidt Signed-off-by: Bartlomiej Zolnierkiewicz --- diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c index 56fb0b8434..ee848c7059 100644 --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -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; }