Fix Samsung pci-e SSD handling on some macbooks (rhbz 1161805)

ahci-disable-MSI-instead-of-NCQ-on-Samsung-pci-e-SSD.patch

@@ -0,0 +1,67 @@
+From: Tejun Heo <tj@kernel.org>
+Date: Mon, 27 Oct 2014 10:30:52 -0400
+Subject: [PATCH] ahci: disable MSI instead of NCQ on Samsung pci-e SSDs on
+ macbooks
+
+From 44aecdabc85087e7c299d7a28e095e2b91894a51 Mon Sep 17 00:00:00 2001
+From: Tejun Heo <tj@kernel.org>
+Date: Mon, 27 Oct 2014 10:22:56 -0400
+
+Samsung pci-e SSDs on macbooks failed miserably on NCQ commands, so
+67809f85d31e ("ahci: disable NCQ on Samsung pci-e SSDs on macbooks")
+disabled NCQ on them.  It turns out that NCQ is fine as long as MSI is
+not used, so let's turn off MSI and leave NCQ on.
+
+Signed-off-by: Tejun Heo <tj@kernel.org>
+Link: https://bugzilla.kernel.org/show_bug.cgi?id=60731
+Tested-by: <dorin@i51.org>
+Tested-by: Imre Kaloz <kaloz@openwrt.org>
+Cc: stable@vger.kernel.org
+Fixes: 67809f85d31e ("ahci: disable NCQ on Samsung pci-e SSDs on macbooks")
+---
+ drivers/ata/ahci.c | 14 +++++++++++---
+ 1 file changed, 11 insertions(+), 3 deletions(-)
+
+diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
+index 5f039f191067..ef4b647b3ed2 100644
+--- a/drivers/ata/ahci.c
++++ b/drivers/ata/ahci.c
+@@ -60,6 +60,7 @@ enum board_ids {
+ 	/* board IDs by feature in alphabetical order */
+ 	board_ahci,
+ 	board_ahci_ign_iferr,
++	board_ahci_nomsi,
+ 	board_ahci_noncq,
+ 	board_ahci_nosntf,
+ 	board_ahci_yes_fbs,
+@@ -121,6 +122,13 @@ static const struct ata_port_info ahci_port_info[] = {
+ 		.udma_mask	= ATA_UDMA6,
+ 		.port_ops	= &ahci_ops,
+ 	},
++	[board_ahci_nomsi] = {
++		AHCI_HFLAGS	(AHCI_HFLAG_NO_MSI),
++		.flags		= AHCI_FLAG_COMMON,
++		.pio_mask	= ATA_PIO4,
++		.udma_mask	= ATA_UDMA6,
++		.port_ops	= &ahci_ops,
++	},
+ 	[board_ahci_noncq] = {
+ 		AHCI_HFLAGS	(AHCI_HFLAG_NO_NCQ),
+ 		.flags		= AHCI_FLAG_COMMON,
+@@ -475,10 +483,10 @@ static const struct pci_device_id ahci_pci_tbl[] = {
+ 	{ PCI_VDEVICE(ASMEDIA, 0x0612), board_ahci },	/* ASM1062 */
+ 
+ 	/*
+-	 * Samsung SSDs found on some macbooks.  NCQ times out.
+-	 * https://bugzilla.kernel.org/show_bug.cgi?id=60731
++	 * Samsung SSDs found on some macbooks.  NCQ times out if MSI is
++	 * enabled.  https://bugzilla.kernel.org/show_bug.cgi?id=60731
+ 	 */
+-	{ PCI_VDEVICE(SAMSUNG, 0x1600), board_ahci_noncq },
++	{ PCI_VDEVICE(SAMSUNG, 0x1600), board_ahci_nomsi },
+ 
+ 	/* Enmotus */
+ 	{ PCI_DEVICE(0x1c44, 0x8000), board_ahci },
+-- 
+1.9.3
+

kernel.spec

@@ -616,6 +616,9 @@ Patch26064: Input-add-driver-for-the-Goodix-touchpanel.patch
 
 Patch26065: sched-Remove-lockdep-check-in-sched_move_task.patch
 
+#rhbz 1161805
+Patch26066: ahci-disable-MSI-instead-of-NCQ-on-Samsung-pci-e-SSD.patch
+
 # git clone ssh://git.fedorahosted.org/git/kernel-arm64.git, git diff master...devel
 Patch30000: kernel-arm64.patch
 
@@ -1341,6 +1344,9 @@ ApplyPatch Input-add-driver-for-the-Goodix-touchpanel.patch
 
 ApplyPatch sched-Remove-lockdep-check-in-sched_move_task.patch
 
+#rhbz 1161805
+ApplyPatch ahci-disable-MSI-instead-of-NCQ-on-Samsung-pci-e-SSD.patch
+
 %if 0%{?aarch64patches}
 ApplyPatch kernel-arm64.patch
 %ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
@@ -2209,6 +2215,9 @@ fi
 #                                    ||----w |
 #                                    ||     ||
 %changelog
+* Mon Nov 10 2014 Josh Boyer <jwboyer@fedoraproject.org>
+- Fix Samsung pci-e SSD handling on some macbooks (rhbz 1161805)
+
 * Mon Nov 10 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.18.0-0.rc4.git0.1
 - Linux v3.18-rc4
 - Temporarily disable aarch64patches