diff options
| author | Alexander Gordeev <agordeev@redhat.com> | 2014-10-06 16:26:35 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-10-06 11:43:36 -0400 |
| commit | 33fb0d01ce60fe4c0c12c4f0c134c5cdb818ac5a (patch) | |
| tree | bcf6430240b39ed54f03709f0fc681831627b7d1 /drivers/ata | |
| parent | 18dcf433f3ded61eb140a55e7048ec2fef79e723 (diff) | |
| download | lwn-33fb0d01ce60fe4c0c12c4f0c134c5cdb818ac5a.tar.gz lwn-33fb0d01ce60fe4c0c12c4f0c134c5cdb818ac5a.zip | |
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@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: linux-ide@vger.kernel.org
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libahci.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 3ce3d23e4f97..5eb61c9e63da 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; |