From: Shane Huang <shane.huang@amd.com>
Date: Sat, 8 Jun 2013 08:00:16 +0000 (+0800)
Subject: ahci: remove pmp link online check in FBS EH
X-Git-Tag: v3.4.54~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9d57dc4b0be6fe82b22dc310724a79a728b48147;p=platform%2Fkernel%2Flinux-stable.git

ahci: remove pmp link online check in FBS EH

commit 912b9ac683b112615d5605686f1dc086402ce9f7 upstream.

ata_link_online() check in ahci_error_intr() is unnecessary, it should
be removed otherwise may lead to lockup with FBS enabled PMP.
http://marc.info/?l=linux-ide&m=137050421603272&w=2

Reported-by: Yu Liu <liuyu.ac@gmail.com>
Signed-off-by: Shane Huang <shane.huang@amd.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index f9eaa82..47a1fb8 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1543,8 +1543,7 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 		u32 fbs = readl(port_mmio + PORT_FBS);
 		int pmp = fbs >> PORT_FBS_DWE_OFFSET;
 
-		if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links) &&
-		    ata_link_online(&ap->pmp_link[pmp])) {
+		if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
 			link = &ap->pmp_link[pmp];
 			fbs_need_dec = true;
 		}