diff options
| author | Zhu Lingshan <lingshan.zhu@intel.com> | 2020-09-09 09:52:34 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-10-21 17:48:10 +0300 |
| commit | 86e182fe12ee5869022614457037097c70fe2ed1 (patch) | |
| tree | 1ad7af0a73787d36f2711762a39bdf633d9dff86 /drivers/vhost | |
| parent | 5745bcfbbf89b158416075374254d3c013488f21 (diff) | |
| download | linux-86e182fe12ee5869022614457037097c70fe2ed1.tar.xz | |
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 <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20200909065234.3313-1-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vdpa.c | 8 | ||||
| -rw-r--r-- | drivers/vhost/vhost.c | 3 | ||||
| -rw-r--r-- | drivers/vhost/vhost.h | 1 |
3 files changed, 1 insertions, 11 deletions
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. */ |