linux-kernel - [ 13/18] ahci: remove pmp link online check in FBS EH

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Date:	Thu, 18 Jul 2013 19:23:28 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Yu Liu <liuyu.ac@...il.com>,
	Shane Huang <shane.huang@....com>, Tejun Heo <tj@...nel.org>
Subject: [ 13/18] ahci: remove pmp link online check in FBS EH

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shane Huang <shane.huang@....com>

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@...il.com>
Signed-off-by: Shane Huang <shane.huang@....com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/ata/libahci.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1495,8 +1495,7 @@ static void ahci_error_intr(struct ata_p
 		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;
 		}


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