linux-kernel - [PATCH] vfio/platform: Replace spin_lock_irqsave by spin

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Date:   Tue, 13 Oct 2020 10:00:58 +0800
From:   Tian Tao <tiantao6@...ilicon.com>
To:     <eric.auger@...hat.com>, <alex.williamson@...hat.com>,
        <cohuck@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <song.bao.hua@...ilicon.com>
CC:     <linuxarm@...wei.com>
Subject: [PATCH] vfio/platform: Replace spin_lock_irqsave by spin_lock in hard IRQ

It is redundant to do irqsave and irqrestore in hardIRQ context.

Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
---
 drivers/vfio/platform/vfio_platform_irq.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index c5b09ec..24fd6c5 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -139,10 +139,9 @@ static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
 static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
 {
 	struct vfio_platform_irq *irq_ctx = dev_id;
-	unsigned long flags;
 	int ret = IRQ_NONE;
 
-	spin_lock_irqsave(&irq_ctx->lock, flags);
+	spin_lock(&irq_ctx->lock);
 
 	if (!irq_ctx->masked) {
 		ret = IRQ_HANDLED;
@@ -152,7 +151,7 @@ static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
 		irq_ctx->masked = true;
 	}
 
-	spin_unlock_irqrestore(&irq_ctx->lock, flags);
+	spin_unlock(&irq_ctx->lock);
 
 	if (ret == IRQ_HANDLED)
 		eventfd_signal(irq_ctx->trigger, 1);
-- 
2.7.4