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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
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@ -1875,8 +1875,6 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
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irq_masked = irq_stat & hpriv->port_map;
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spin_lock(&host->lock);
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for (i = 0; i < host->n_ports; i++) {
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struct ata_port *ap;
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@ -1908,8 +1906,6 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
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*/
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writel(irq_stat, mmio + HOST_IRQ_STAT);
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spin_unlock(&host->lock);
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VPRINTK("EXIT\n");
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return handled ? IRQ_WAKE_THREAD : IRQ_NONE;
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