From: Christof Schmitt <christof.schmitt@de.ibm.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-scsi@vger.kernel.org, linux-s390@vger.kernel.org,
schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com,
Swen Schillig <swen@vnet.ibm.com>,
Christof Schmitt <christof.schmitt@de.ibm.com>
Subject: [patch 11/13] zfcp: fix erp list usage without using locks
Date: Wed, 01 Oct 2008 12:42:24 +0200 [thread overview]
Message-ID: <20081001104804.968111000@de.ibm.com> (raw)
In-Reply-To: 20081001104213.585200000@de.ibm.com
[-- Attachment #1: zfcp_use_dbf_lock_version.diff --]
[-- Type: text/plain, Size: 1039 bytes --]
From: Swen Schillig <swen@vnet.ibm.com>
The zfcp_erp_thread was using the nolock version of the dbf function.
This resulted in a list access while other tasks could modifying the
list. The symptom was an erp thread running at 100% CPU and never
returning from the dbf function.
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
---
drivers/s390/scsi/zfcp_erp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/s390/scsi/zfcp_erp.c 2008-09-30 13:52:22.000000000 +0200
+++ b/drivers/s390/scsi/zfcp_erp.c 2008-09-30 13:52:30.000000000 +0200
@@ -1395,9 +1395,9 @@ static int zfcp_erp_thread(void *data)
zfcp_erp_wakeup(adapter);
}
- zfcp_rec_dbf_event_thread(4, adapter);
+ zfcp_rec_dbf_event_thread_lock(4, adapter);
down_interruptible(&adapter->erp_ready_sem);
- zfcp_rec_dbf_event_thread(5, adapter);
+ zfcp_rec_dbf_event_thread_lock(5, adapter);
}
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
--
next prev parent reply other threads:[~2008-10-01 10:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-01 10:42 [patch 00/13] zfcp updates for 2.6.28 Christof Schmitt
2008-10-01 10:42 ` [patch 01/13] zfcp: add queue_full sysfs attribute Christof Schmitt
2008-10-01 10:42 ` [patch 02/13] zfcp: Update message with input from review Christof Schmitt
2008-10-01 10:42 ` [patch 03/13] zfcp: remove unused references, declarations and flags Christof Schmitt
2008-10-01 10:42 ` [patch 04/13] zfcp: attach and release SAN nameserver port on demand Christof Schmitt
2008-10-01 10:42 ` [patch 05/13] zfcp: remove all typedefs and replace them with standards Christof Schmitt
2008-10-01 10:42 ` [patch 06/13] zfcp: Simplify get_adapter_by_busid Christof Schmitt
2008-10-01 10:42 ` [patch 07/13] zfcp: Simplify zfcp data structures Christof Schmitt
2008-10-01 10:42 ` [patch 08/13] zfcp: put threshold data in hba trace Christof Schmitt
2008-10-01 10:42 ` [patch 09/13] zfcp: deadlock via shared work queue tasks Christof Schmitt
2008-10-01 10:42 ` [patch 10/13] zfcp: prevent fc_remote_port_delete calls for unregistered rport Christof Schmitt
2008-10-01 10:42 ` Christof Schmitt [this message]
2008-10-01 10:42 ` [patch 12/13] zfcp: wait on SCSI work to be finished before proceeding with init dev Christof Schmitt
2008-10-01 10:42 ` [patch 13/13] zfcp: fix double dbf id usage Christof Schmitt
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