From: Alexander Gordeev Date: Mon, 6 Oct 2014 15:26:35 +0000 (+0100) Subject: AHCI: Do not acquire ata_host::lock from single IRQ handler X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=33fb0d01ce60fe4c0c12c4f0c134c5cdb818ac5a;p=linux-beck.git 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 Signed-off-by: Tejun Heo Cc: linux-ide@vger.kernel.org --- 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;