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 04/18] [PATCH] zfcp: Simplify latency lock handling
Date: Mon, 02 Mar 2009 13:08:57 +0100 [thread overview]
Message-ID: <20090302121002.549246000@de.ibm.com> (raw)
In-Reply-To: 20090302120853.279447000@de.ibm.com
[-- Attachment #1: 703-zfcp-lat-lock.diff --]
[-- Type: text/plain, Size: 2636 bytes --]
From: Christof Schmitt <christof.schmitt@de.ibm.com>
The lock only needs to protect the softirq context called from qdio
against the userspace context called from sysfs. spin_lock and
spin_lock_bh is enough.
Acked-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
---
drivers/s390/scsi/zfcp_fsf.c | 5 ++---
drivers/s390/scsi/zfcp_sysfs.c | 5 ++---
2 files changed, 4 insertions(+), 6 deletions(-)
diff -urpN linux-2.6/drivers/s390/scsi/zfcp_fsf.c linux-2.6-patched/drivers/s390/scsi/zfcp_fsf.c
--- linux-2.6/drivers/s390/scsi/zfcp_fsf.c 2009-03-01 16:41:30.000000000 +0100
+++ linux-2.6-patched/drivers/s390/scsi/zfcp_fsf.c 2009-03-01 16:41:30.000000000 +0100
@@ -2069,7 +2069,6 @@ static void zfcp_fsf_req_latency(struct
struct fsf_qual_latency_info *lat_inf;
struct latency_cont *lat;
struct zfcp_unit *unit = req->unit;
- unsigned long flags;
lat_inf = &req->qtcb->prefix.prot_status_qual.latency_info;
@@ -2087,11 +2086,11 @@ static void zfcp_fsf_req_latency(struct
return;
}
- spin_lock_irqsave(&unit->latencies.lock, flags);
+ spin_lock(&unit->latencies.lock);
zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
lat->counter++;
- spin_unlock_irqrestore(&unit->latencies.lock, flags);
+ spin_unlock(&unit->latencies.lock);
}
#ifdef CONFIG_BLK_DEV_IO_TRACE
diff -urpN linux-2.6/drivers/s390/scsi/zfcp_sysfs.c linux-2.6-patched/drivers/s390/scsi/zfcp_sysfs.c
--- linux-2.6/drivers/s390/scsi/zfcp_sysfs.c 2009-03-01 16:41:30.000000000 +0100
+++ linux-2.6-patched/drivers/s390/scsi/zfcp_sysfs.c 2009-03-01 16:41:30.000000000 +0100
@@ -318,10 +318,9 @@ zfcp_sysfs_unit_##_name##_latency_show(s
struct zfcp_unit *unit = sdev->hostdata; \
struct zfcp_latencies *lat = &unit->latencies; \
struct zfcp_adapter *adapter = unit->port->adapter; \
- unsigned long flags; \
unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc; \
\
- spin_lock_irqsave(&lat->lock, flags); \
+ spin_lock_bh(&lat->lock); \
fsum = lat->_name.fabric.sum * adapter->timer_ticks; \
fmin = lat->_name.fabric.min * adapter->timer_ticks; \
fmax = lat->_name.fabric.max * adapter->timer_ticks; \
@@ -329,7 +328,7 @@ zfcp_sysfs_unit_##_name##_latency_show(s
cmin = lat->_name.channel.min * adapter->timer_ticks; \
cmax = lat->_name.channel.max * adapter->timer_ticks; \
cc = lat->_name.counter; \
- spin_unlock_irqrestore(&lat->lock, flags); \
+ spin_unlock_bh(&lat->lock); \
\
do_div(fsum, 1000); \
do_div(fmin, 1000); \
next prev parent reply other threads:[~2009-03-02 12:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-02 12:08 [patch 00/18] zfcp updates for 2.6.30 Christof Schmitt
2009-03-02 12:08 ` [patch 01/18] [PATCH] zfcp: Remove some port flags Christof Schmitt
2009-03-02 12:08 ` [patch 02/18] [PATCH] zfcp: Remove UNIT_REGISTERED status flag Christof Schmitt
2009-03-02 12:08 ` [patch 03/18] [Patch] zfcp: add measurement data for average qdio queue utilisation Christof Schmitt
2009-03-02 12:08 ` Christof Schmitt [this message]
2009-03-02 12:08 ` [patch 05/18] [PATCH] zfcp: Only increment req_id for successfully issued requests Christof Schmitt
2009-03-02 12:08 ` [patch 06/18] [PATCH] zfcp: Wait for free SBALs when possible Christof Schmitt
2009-03-02 12:09 ` [patch 07/18] [PATCH] zfcp: Improve reliability of SCSI eh handlers in zfcp Christof Schmitt
2009-03-02 12:09 ` [patch 08/18] [PATCH] zfcp: Send ELS ADISC from workqueue Christof Schmitt
2009-03-02 12:09 ` [patch 09/18] [PATCH] zfcp: remove undefined subtype for status read response Christof Schmitt
2009-03-02 12:09 ` [patch 10/18] [PATCH] zfcp: prevent adapter close on initial adapter open Christof Schmitt
2009-03-02 12:09 ` [patch 11/18] [PATCH] zfcp: replace current ERP logging with a more convenient version Christof Schmitt
2009-03-02 12:09 ` [patch 12/18] [PATCH] zfcp: Remove PCI flag Christof Schmitt
2009-03-02 12:09 ` [patch 13/18] [PATCH] zfcp: Report fc_host_port_type as NPIV Christof Schmitt
2009-03-02 12:09 ` [patch 14/18] [PATCH] zfcp: incorrect reaction on incoming RSCN Christof Schmitt
2009-03-02 12:09 ` [patch 15/18] [PATCH] zfcp: Block FC transport rports early on errors Christof Schmitt
2009-03-02 12:09 ` [patch 16/18] [PATCH] zfcp: erp failed status bit will not be set Christof Schmitt
2009-03-02 12:09 ` [patch 17/18] [PATCH] zfcp: fix queue, scheduled work processing Christof Schmitt
2009-03-02 12:09 ` [patch 18/18] [PATCH] zfcp: Ensure all work is cancelled on adapter dequeue Christof Schmitt
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