linux-kernel - [PATCH] mpt3sas: Fix panic when aer correct error occured

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Date:	Tue, 12 Jul 2016 17:43:25 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	<martin.petersen@...cle.com>,
	<suganath-prabu.subramani@...adcom.com>,
	<MPT-FusionLinux.pdl@...adcom.com>
CC:	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<guohanjun@...wei.com>, Kefeng Wang <wangkefeng.wang@...wei.com>,
	"Sathya Prakash" <sathya.prakash@...adcom.com>,
	Chaitra P B <chaitra.basappa@...adcom.com>
Subject: [PATCH] mpt3sas: Fix panic when aer correct error occured

The _scsih_pci_mmio_enabled called if scsih_pci_error_detected returns
PCI_ERS_RESULT_CAN_RECOVER, at this point, read/write to the device
still works, no need to reset slot.

Or the mpt3sas_base_map_resources in scsih_pci_slot_reset will fail,
and iounamp ioc->chip, then we will meet issue when read ioc->chip
in mpt3sas_base_get_iocstate from _base_fault_reset_work.

Cc: Sathya Prakash <sathya.prakash@...adcom.com>
Cc: Chaitra P B <chaitra.basappa@...adcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---

NOTE: I found this with an earlier kernel version, but the logic is not changed.

 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 6bff13e..eedd62e3 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -9033,8 +9033,11 @@ scsih_pci_mmio_enabled(struct pci_dev *pdev)
 
 	/* TODO - dump whatever for debugging purposes */
 
-	/* Request a slot reset. */
-	return PCI_ERS_RESULT_NEED_RESET;
+	/* This called only if scsih_pci_error_detected returns
+	 * PCI_ERS_RESULT_CAN_RECOVER, read/write to the device
+	 * still works, not need to reset slot.
+	 */
+	return PCI_ERS_RESULT_RECOVERED;
 }
 
 /*
-- 
1.7.12.4