linux-kernel - [PATCH 4.4 16/20] scsi: mpt3sas: disable ASPM for MPI2 controllers

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Message-Id: <20170213130404.241151665@linuxfoundation.org>
Date:   Mon, 13 Feb 2017 05:05:01 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Slava Kardakov <ojab@...b.ru>,
        Sreekanth Reddy <Sreekanth.Reddy@...adcom.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.4 16/20] scsi: mpt3sas: disable ASPM for MPI2 controllers

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

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

From: ojab <ojab@...b.ru>

commit ffdadd68af5a397b8a52289ab39d62e1acb39e63 upstream.

MPI2 controllers sometimes got lost (i.e. disappear from
/sys/bus/pci/devices) if ASMP is enabled.

Signed-off-by: Slava Kardakov <ojab@...b.ru>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=60644
Acked-by: Sreekanth Reddy <Sreekanth.Reddy@...adcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -51,6 +51,7 @@
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
+#include <linux/pci-aspm.h>
 #include <linux/interrupt.h>
 #include <linux/aer.h>
 #include <linux/raid_class.h>
@@ -8483,6 +8484,8 @@ _scsih_probe(struct pci_dev *pdev, const
 
 	switch (hba_mpi_version) {
 	case MPI2_VERSION:
+		pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
+			PCIE_LINK_STATE_L1 | PCIE_LINK_STATE_CLKPM);
 		/* Use mpt2sas driver host template for SAS 2.0 HBA's */
 		shost = scsi_host_alloc(&mpt2sas_driver_template,
 		  sizeof(struct MPT3SAS_ADAPTER));