From f1f5a807b051eddd3f302e503d39214e5bde0ef2 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 27 Aug 2010 11:09:15 +0200 Subject: [PATCH] ahci: fix hang on failed softreset 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 Reported-by: Anssi Hannula Tested-by: Gwendal Grignou Cc: stable@kernel.org Signed-off-by: Jeff Garzik --- drivers/ata/libahci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 666850d..68dc678 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -1326,7 +1326,7 @@ 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; -- 2.7.4