libata: don't check n_sectors during revalidation if zero

If the initial configuration fails early, n_sectors is left at zero.
Checking against it during revalidation makes retried configuration
fail due to n_sectors mismatch.  Ignore zero n_sectors during
revalidation.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9bfe329fb579..2ad4dda6d4a7 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3700,7 +3700,8 @@ int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
                 goto fail;
 
         /* verify n_sectors hasn't changed */
-        if (dev->class == ATA_DEV_ATA && dev->n_sectors != n_sectors) {
+        if (dev->class == ATA_DEV_ATA && n_sectors &&
+            dev->n_sectors != n_sectors) {
                 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
                                "%llu != %llu\n",
                                (unsigned long long)n_sectors,