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>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 27d936279574..b38a0f9bc9f7 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -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;