linux-kernel - [PATCH 2.6.32 18/55] libata: disable forced PORTS

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Date:	Fri, 04 Mar 2016 16:30:18 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>, Andy Lutomirski <luto@...capital.net>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 18/55] libata: disable forced PORTS_IMPL for >= AHCI 1.3

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Tejun Heo <tj@...nel.org>

commit 566d1827df2ef0cbe921d3d6946ac3007b1a6938 upstream.

Some early controllers incorrectly reported zero ports in PORTS_IMPL
register and the ahci driver fabricates PORTS_IMPL from the number of
ports in those cases.  This hasn't mattered but with the new nvme
controllers there are cases where zero PORTS_IMPL is valid and should
be honored.

Disable the workaround for >= AHCI 1.3.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Andy Lutomirski <luto@...capital.net>
Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@mail.gmail.com
Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
[wt: file is drivers/ata/ahci.c in 2.6.32]
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/ata/ahci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6787aab..c075664 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -924,8 +924,8 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
 		}
 	}
 
-	/* fabricate port_map from cap.nr_ports */
-	if (!port_map) {
+	/* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
+	if (!port_map && vers < 0x10300) {
 		port_map = (1 << ahci_nr_ports(cap)) - 1;
 		dev_printk(KERN_WARNING, &pdev->dev,
 			   "forcing PORTS_IMPL to 0x%x\n", port_map);
-- 
1.7.12.2.21.g234cd45.dirty