[4.2.y-ckt stable] Patch "libata: disable forced PORTS_IMPL for >= AHCI 1.3" has been added to the 4.2.y-ckt tree
Kamal Mostafa
kamal at canonical.com
Mon Mar 7 22:31:20 UTC 2016
This is a note to let you know that I have just added a patch titled
libata: disable forced PORTS_IMPL for >= AHCI 1.3
to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue
This patch is scheduled to be released in version 4.2.8-ckt5.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
---8<------------------------------------------------------------
>From 40d7bf80c286c2407fdb1d14660c9146288b3521 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj at kernel.org>
Date: Fri, 15 Jan 2016 15:13:05 -0500
Subject: libata: disable forced PORTS_IMPL for >= AHCI 1.3
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 at kernel.org>
Reported-by: Andy Lutomirski <luto at amacapital.net>
Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@mail.gmail.com
Cc: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/ata/libahci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 98c482a..317f85d 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -495,8 +495,8 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
}
}
- /* 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);
--
2.7.0
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