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ide: fix PowerMac bootup oops 

PowerMac bootup with CONFIG_IDE=y oopses in ide_pio_cycle_time():
because "ide: try to use PIO Mode 0 during probe if possible" causes
pmac_ide_set_pio_mode() to be called before drive->id has been set.

Bart points out other places which now need drive->id set earlier,
so follow his advice to allocate it in ide_port_alloc_devices()
(using kzalloc_node, without error message, as when allocating drive)
and memset it for reuse in ide_port_init_devices_data().

Fixed in passing: ide_host_alloc() was missing ide_port_free_devices()
from an error path.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Joao Ramos <joao.ramos@inov.pt>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Hugh Dickins 2009-06-10 14:37:20 +02:00 committed by Bartlomiej Zolnierkiewicz
parent a20b2a44ec
commit 5f4417a156
1 changed files with 21 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/ide/ide-probe.c
View File

@ -465,23 +465,8 @@ static u8 probe_for_drive(ide_drive_t *drive)
int rc;
u8 cmd;
/*
* In order to keep things simple we have an id
* block for all drives at all times. If the device
* is pre ATA or refuses ATA/ATAPI identify we
* will add faked data to this.
*
* Also note that 0 everywhere means "can't do X"
*/
drive->dev_flags &= ~IDE_DFLAG_ID_READ;
drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
if (drive->id == NULL) {
printk(KERN_ERR "ide: out of memory for id data.\n");
return 0;
}
m = (char *)&drive->id[ATA_ID_PROD];
strcpy(m, "UNKNOWN");
@ -497,7 +482,7 @@ static u8 probe_for_drive(ide_drive_t *drive)
}
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
goto out_free;
return 0;
/* identification failed? */
if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
@ -521,7 +506,7 @@ static u8 probe_for_drive(ide_drive_t *drive)
}
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
goto out_free;
return 0;
/* The drive wasn't being helpful. Add generic info only */
if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
@ -535,9 +520,6 @@ static u8 probe_for_drive(ide_drive_t *drive)
}
return 1;
out_free:
kfree(drive->id);
return 0;
}
static void hwif_release_dev(struct device *dev)
@ -825,8 +807,6 @@ static int ide_port_setup_devices(ide_hwif_t *hwif)
if (ide_init_queue(drive)) {
printk(KERN_ERR "ide: failed to init %s\n",
drive->name);
kfree(drive->id);
drive->id = NULL;
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
continue;
}
@ -955,9 +935,6 @@ static void drive_release_dev (struct device *dev)
blk_cleanup_queue(drive->queue);
drive->queue = NULL;
kfree(drive->id);
drive->id = NULL;
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
complete(&drive->gendev_rel_comp);
@ -1140,8 +1117,11 @@ static void ide_port_init_devices_data(ide_hwif_t *hwif)
ide_port_for_each_dev(i, drive, hwif) {
u8 j = (hwif->index * MAX_DRIVES) + i;
u16 *saved_id = drive->id;
memset(drive, 0, sizeof(*drive));
memset(saved_id, 0, SECTOR_SIZE);
drive->id = saved_id;
drive->media = ide_disk;
drive->select = (i << 4) | ATA_DEVICE_OBS;
@ -1248,8 +1228,10 @@ static void ide_port_free_devices(ide_hwif_t *hwif)
ide_drive_t *drive;
int i;
ide_port_for_each_dev(i, drive, hwif)
ide_port_for_each_dev(i, drive, hwif) {
kfree(drive->id);
kfree(drive);
}
}
static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
@ -1263,6 +1245,18 @@ static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
if (drive == NULL)
goto out_nomem;
/*
* In order to keep things simple we have an id
* block for all drives at all times. If the device
* is pre ATA or refuses ATA/ATAPI identify we
* will add faked data to this.
*
* Also note that 0 everywhere means "can't do X"
*/
drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
if (drive->id == NULL)
goto out_nomem;
hwif->devices[i] = drive;
}
return 0;
@ -1304,6 +1298,7 @@ struct ide_host *ide_host_alloc(const struct ide_port_info *d,
if (idx < 0) {
printk(KERN_ERR "%s: no free slot for interface\n",
d ? d->name : "ide");
ide_port_free_devices(hwif);
kfree(hwif);
continue;
}