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libata: during revalidation, check n_sectors after device is configured 

Device might be resized during ata_dev_configure() due to HPA or
(later) ACPI _GTF.  Currently it's worked around by caching n_sectors
before turning off HPA.  The cached original size is overwritten if
the device is reconfigured without being hardreset - which always
happens after configuring trasnfer mode.  If the device gets hardreset
for some reason after that, revalidation fails with -ENODEV.

This patch makes size checking more robust by moving n_sectors check
from ata_dev_reread_id() to ata_dev_revalidate() after the device is
fully configured.  No matter what happens during configuration, a
device must have the same n_sectors after fully configured to be
treated as the same device.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-05-15 03:28:15 +09:00 committed by Jeff Garzik
parent fe30911b34
commit 6ddcd3b020
2 changed files with 15 additions and 19 deletions
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31
drivers/ata/libata-core.c
View File

@ -1919,7 +1919,6 @@ int ata_dev_configure(struct ata_device *dev)
snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
dev->n_sectors = ata_id_n_sectors(id);
dev->n_sectors_boot = dev->n_sectors;
/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
@ -3632,7 +3631,6 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
const u16 *old_id = dev->id;
unsigned char model[2][ATA_ID_PROD_LEN + 1];
unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
u64 new_n_sectors;
if (dev->class != new_class) {
ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
@ -3644,7 +3642,6 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
new_n_sectors = ata_id_n_sectors(new_id);
if (strcmp(model[0], model[1])) {
ata_dev_printk(dev, KERN_INFO, "model number mismatch "
@ -3658,19 +3655,6 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
return 0;
}
if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
"%llu != %llu\n",
(unsigned long long)dev->n_sectors,
(unsigned long long)new_n_sectors);
/* Are we the boot time size - if so we appear to be the
same disk at this point and our HPA got reapplied */
if (ata_ignore_hpa && dev->n_sectors_boot == new_n_sectors
&& ata_id_hpa_enabled(new_id))
return 1;
return 0;
}
return 1;
}
@ -3723,6 +3707,7 @@ int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
*/
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
u64 n_sectors = dev->n_sectors;
int rc;
if (!ata_dev_enabled(dev))
@ -3735,7 +3720,19 @@ int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
/* configure device according to the new ID */
rc = ata_dev_configure(dev);
if (rc == 0)
if (rc)
goto fail;
/* verify n_sectors hasn't changed */
if (dev->class == ATA_DEV_ATA && dev->n_sectors != n_sectors) {
ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
"%llu != %llu\n",
(unsigned long long)n_sectors,
(unsigned long long)dev->n_sectors);
rc = -ENODEV;
goto fail;
}
return 0;
fail:

1
include/linux/libata.h
View File

@ -431,7 +431,6 @@ struct ata_device {
struct scsi_device *sdev; /* attached SCSI device */
/* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
u64 n_sectors; /* size of device, if ATA */
u64 n_sectors_boot; /* size of ATA device at startup */
unsigned int class; /* ATA_DEV_xxx */
u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
u8 pio_mode;