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From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
To: davem@davemloft.net, sowmini.varadhan@oracle.com
Cc: netdev@vger.kernel.org, sparclinux@vger.kernel.org
Subject: [PATCHv5 3/4] sparc64: Avoid irqsave/restore on vio.lock if in_softirq()
Date: Wed, 22 Oct 2014 22:12:45 +0000	[thread overview]
Message-ID: <20141022221245.GE17252@oracle.com> (raw)


For NAPIfied drivers , there is no need to
synchronize by doing irqsave/restore on vio.lock in the I/O
path.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
---
 arch/sparc/kernel/viohs.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/kernel/viohs.c b/arch/sparc/kernel/viohs.c
index 526fcb5..92e2a32 100644
--- a/arch/sparc/kernel/viohs.c
+++ b/arch/sparc/kernel/viohs.c
@@ -747,10 +747,11 @@ EXPORT_SYMBOL(vio_ldc_free);
 
 void vio_port_up(struct vio_driver_state *vio)
 {
-	unsigned long flags;
+	unsigned long flags = 0;
 	int err, state;
 
-	spin_lock_irqsave(&vio->lock, flags);
+	if (!in_softirq())
+		spin_lock_irqsave(&vio->lock, flags);
 
 	state = ldc_state(vio->lp);
 
@@ -777,7 +778,8 @@ void vio_port_up(struct vio_driver_state *vio)
 		mod_timer(&vio->timer, expires);
 	}
 
-	spin_unlock_irqrestore(&vio->lock, flags);
+	if (!in_softirq())
+		spin_unlock_irqrestore(&vio->lock, flags);
 }
 EXPORT_SYMBOL(vio_port_up);
 
-- 
1.8.4.2


WARNING: multiple messages have this Message-ID (diff)
From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
To: davem@davemloft.net, sowmini.varadhan@oracle.com
Cc: netdev@vger.kernel.org, sparclinux@vger.kernel.org
Subject: [PATCHv5 3/4] sparc64: Avoid irqsave/restore on vio.lock if in_softirq()
Date: Wed, 22 Oct 2014 18:12:45 -0400	[thread overview]
Message-ID: <20141022221245.GE17252@oracle.com> (raw)


For NAPIfied drivers , there is no need to
synchronize by doing irqsave/restore on vio.lock in the I/O
path.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
---
 arch/sparc/kernel/viohs.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/kernel/viohs.c b/arch/sparc/kernel/viohs.c
index 526fcb5..92e2a32 100644
--- a/arch/sparc/kernel/viohs.c
+++ b/arch/sparc/kernel/viohs.c
@@ -747,10 +747,11 @@ EXPORT_SYMBOL(vio_ldc_free);
 
 void vio_port_up(struct vio_driver_state *vio)
 {
-	unsigned long flags;
+	unsigned long flags = 0;
 	int err, state;
 
-	spin_lock_irqsave(&vio->lock, flags);
+	if (!in_softirq())
+		spin_lock_irqsave(&vio->lock, flags);
 
 	state = ldc_state(vio->lp);
 
@@ -777,7 +778,8 @@ void vio_port_up(struct vio_driver_state *vio)
 		mod_timer(&vio->timer, expires);
 	}
 
-	spin_unlock_irqrestore(&vio->lock, flags);
+	if (!in_softirq())
+		spin_unlock_irqrestore(&vio->lock, flags);
 }
 EXPORT_SYMBOL(vio_port_up);
 
-- 
1.8.4.2


             reply	other threads:[~2014-10-22 22:12 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-22 22:12 Sowmini Varadhan [this message]
2014-10-22 22:12 ` [PATCHv5 3/4] sparc64: Avoid irqsave/restore on vio.lock if in_softirq() Sowmini Varadhan
2014-10-25 18:28 ` David Miller
2014-10-25 18:28   ` David Miller

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