ahci: fix hang on failed softreset

commit f1f5a807b051eddd3f302e503d39214e5bde0ef2 upstream.

ahci_do_softreset() compared the current time and deadline in reverse
when calculating timeout for SRST issue.  The result is that if
@deadline is in future, SRST is issued with 0 timeout, which hasn't
caused any problem because it later waits for DRDY with the correct
timeout.  If deadline is already exceeded by the time SRST is about to
be issued, the timeout calculation underflows and if the device
doesn't respond, timeout doesn't trigger for a _very_ long time.

Reverse the incorrect comparison order.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Anssi Hannula <anssi.hannula@iki.fi>
Tested-by: Gwendal Grignou <gwendal@google.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 81e772a94d59857187fda27dbfe7702469fb590f..98c80e1ab6e99769aceb561660f3bf14262f906d 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1320,7 +1320,7 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
        /* issue the first D2H Register FIS */
        msecs = 0;
        now = jiffies;
-       if (time_after(now, deadline))
+       if (time_after(deadline, now))
                msecs = jiffies_to_msecs(deadline - now);
 
        tf.ctl |= ATA_SRST;