From 86e182fe12ee5869022614457037097c70fe2ed1 Mon Sep 17 00:00:00 2001 From: Zhu Lingshan Date: Wed, 9 Sep 2020 14:52:34 +0800 Subject: vhost_vdpa: remove unnecessary spin_lock in vhost_vring_call This commit removed unnecessary spin_locks in vhost_vring_call and related operations. Because we manipulate irq offloading contents in vhost_vdpa ioctl code path which is already protected by dev mutex and vq mutex. Signed-off-by: Zhu Lingshan Link: https://lore.kernel.org/r/20200909065234.3313-1-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang --- drivers/vhost/vdpa.c | 8 +------- drivers/vhost/vhost.c | 3 --- drivers/vhost/vhost.h | 1 - 3 files changed, 1 insertion(+), 11 deletions(-) (limited to 'drivers/vhost') diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 0bef5b10f044..a2dbc85e0b0d 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -96,26 +96,20 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) return; irq = ops->get_vq_irq(vdpa, qid); - spin_lock(&vq->call_ctx.ctx_lock); irq_bypass_unregister_producer(&vq->call_ctx.producer); - if (!vq->call_ctx.ctx || irq < 0) { - spin_unlock(&vq->call_ctx.ctx_lock); + if (!vq->call_ctx.ctx || irq < 0) return; - } vq->call_ctx.producer.token = vq->call_ctx.ctx; vq->call_ctx.producer.irq = irq; ret = irq_bypass_register_producer(&vq->call_ctx.producer); - spin_unlock(&vq->call_ctx.ctx_lock); } static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid) { struct vhost_virtqueue *vq = &v->vqs[qid]; - spin_lock(&vq->call_ctx.ctx_lock); irq_bypass_unregister_producer(&vq->call_ctx.producer); - spin_unlock(&vq->call_ctx.ctx_lock); } static void vhost_vdpa_reset(struct vhost_vdpa *v) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 5c5edd4ff04b..5c835a292783 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -302,7 +302,6 @@ static void vhost_vring_call_reset(struct vhost_vring_call *call_ctx) { call_ctx->ctx = NULL; memset(&call_ctx->producer, 0x0, sizeof(struct irq_bypass_producer)); - spin_lock_init(&call_ctx->ctx_lock); } static void vhost_vq_reset(struct vhost_dev *dev, @@ -1650,9 +1649,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg break; } - spin_lock(&vq->call_ctx.ctx_lock); swap(ctx, vq->call_ctx.ctx); - spin_unlock(&vq->call_ctx.ctx_lock); break; case VHOST_SET_VRING_ERR: if (copy_from_user(&f, argp, sizeof f)) { diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 5fe4b478c215..e016cd3fa02f 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -64,7 +64,6 @@ enum vhost_uaddr_type { struct vhost_vring_call { struct eventfd_ctx *ctx; struct irq_bypass_producer producer; - spinlock_t ctx_lock; }; /* The virtqueue structure describes a queue attached to a device. */ -- cgit v1.2.3