linux-kernel - [PATCH 5.0 067/101] scsi: aacraid: Insure we dont access PCIe space during AER/EEH

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Message-Id: <20190502143344.314278251@linuxfoundation.org>
Date:   Thu,  2 May 2019 17:21:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Carroll <david.carroll@...rosemi.com>,
        Sagar Biradar <sagar.biradar@...rochip.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: [PATCH 5.0 067/101] scsi: aacraid: Insure we dont access PCIe space during AER/EEH

[ Upstream commit b6554cfe09e1f610aed7d57164ab7760be57acd9 ]

There are a few windows during AER/EEH when we can access PCIe I/O mapped
registers. This will harden the access to insure we do not allow PCIe
access during errors

Signed-off-by: Dave Carroll <david.carroll@...rosemi.com>
Reviewed-by: Sagar Biradar <sagar.biradar@...rochip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 drivers/scsi/aacraid/aacraid.h | 7 ++++++-
 drivers/scsi/aacraid/commsup.c | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 3291d1c16864..8bd09b96ea18 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -2640,9 +2640,14 @@ static inline unsigned int cap_to_cyls(sector_t capacity, unsigned divisor)
 	return capacity;
 }
 
+static inline int aac_pci_offline(struct aac_dev *dev)
+{
+	return pci_channel_offline(dev->pdev) || dev->handle_pci_error;
+}
+
 static inline int aac_adapter_check_health(struct aac_dev *dev)
 {
-	if (unlikely(pci_channel_offline(dev->pdev)))
+	if (unlikely(aac_pci_offline(dev)))
 		return -1;
 
 	return (dev)->a_ops.adapter_check_health(dev);
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index a3adc954f40f..09367b8a3885 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -672,7 +672,7 @@ int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
 					return -ETIMEDOUT;
 				}
 
-				if (unlikely(pci_channel_offline(dev->pdev)))
+				if (unlikely(aac_pci_offline(dev)))
 					return -EFAULT;
 
 				if ((blink = aac_adapter_check_health(dev)) > 0) {
@@ -772,7 +772,7 @@ int aac_hba_send(u8 command, struct fib *fibptr, fib_callback callback,
 
 		spin_unlock_irqrestore(&fibptr->event_lock, flags);
 
-		if (unlikely(pci_channel_offline(dev->pdev)))
+		if (unlikely(aac_pci_offline(dev)))
 			return -EFAULT;
 
 		fibptr->flags |= FIB_CONTEXT_FLAG_WAIT;
-- 
2.19.1