This is a note to let you know that I've just added the patch titled
libata: disable forced PORTS_IMPL for >= AHCI 1.3
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libata-disable-forced-ports_impl-for-ahci-1.3.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 566d1827df2ef0cbe921d3d6946ac3007b1a6938 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Fri, 15 Jan 2016 15:13:05 -0500
Subject: libata: disable forced PORTS_IMPL for >= AHCI 1.3
From: Tejun Heo <tj@xxxxxxxxxx>
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@xxxxxxxxxx>
Reported-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@xxxxxxxxxxxxxx
Cc: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/libahci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -486,8 +486,8 @@ void ahci_save_initial_config(struct dev
}
}
- /* 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_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
Patches currently in stable-queue which might be from tj@xxxxxxxxxx are
queue-3.10/ahci-fix-softreset-failed-issue-of-port-multiplier.patch
queue-3.10/ahci-intel-dnv-device-ids-sata.patch
queue-3.10/libata-disable-forced-ports_impl-for-ahci-1.3.patch
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