linux-kernel - [PATCH 7/5] AHCI: Do not acquire ata_host::lock from single IRQ handler

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Message-ID: <20141006152635.GB18209@agordeev.usersys.redhat.com>
Date:	Mon, 6 Oct 2014 16:26:35 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-ide@...r.kernel.org
Subject: [PATCH 7/5] AHCI: Do not acquire ata_host::lock from single IRQ
 handler

There is no need to acquire ata_host::lock spinlock from
hardware context single IRQ interrupt handler since the
handler does not access host data that could be altered
by concurrent processors.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
Cc: linux-ide@...r.kernel.org
---
 drivers/ata/libahci.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 3ce3d23..5eb61c9 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1875,8 +1875,6 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
 
 	irq_masked = irq_stat & hpriv->port_map;
 
-	spin_lock(&host->lock);
-
 	for (i = 0; i < host->n_ports; i++) {
 		struct ata_port *ap;
 
@@ -1908,8 +1906,6 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
 	 */
 	writel(irq_stat, mmio + HOST_IRQ_STAT);
 
-	spin_unlock(&host->lock);
-
 	VPRINTK("EXIT\n");
 
 	return handled ? IRQ_WAKE_THREAD : IRQ_NONE;
-- 
1.8.3.1

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
--
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