linux-kernel - [37/48] SCSI: mpt2sas: Release spinlock for the raid device list before blocking it

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Message-Id: <20120116184518.844125843@clark.kroah.org>
Date:	Mon, 16 Jan 2012 10:45:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@....com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [37/48] SCSI: mpt2sas: Release spinlock for the raid device list before blocking it

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

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

From: "nagalakshmi.nandigama@....com" <nagalakshmi.nandigama@....com>

commit 30c43282f3d347f47f9e05199d2b14f56f3f2837 upstream.

Added code to release the spinlock that is used to protect the
raid device list before calling a function that can block. The
blocking was causing a reschedule, and subsequently it is tried
to acquire the same lock, resulting in a panic (NMI Watchdog
detecting a CPU lockup).

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@....com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/mpt2sas/mpt2sas_scsih.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -6564,6 +6564,7 @@ _scsih_mark_responding_raid_device(struc
 			} else
 				sas_target_priv_data = NULL;
 			raid_device->responding = 1;
+			spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
 			starget_printk(KERN_INFO, raid_device->starget,
 			    "handle(0x%04x), wwid(0x%016llx)\n", handle,
 			    (unsigned long long)raid_device->wwid);
@@ -6574,16 +6575,16 @@ _scsih_mark_responding_raid_device(struc
 			 */
 			_scsih_init_warpdrive_properties(ioc, raid_device);
 			if (raid_device->handle == handle)
-				goto out;
+				return;
 			printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
 			    raid_device->handle);
 			raid_device->handle = handle;
 			if (sas_target_priv_data)
 				sas_target_priv_data->handle = handle;
-			goto out;
+			return;
 		}
 	}
- out:
+
 	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
 }
 


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