From c32ee693125aa19a021dad32abbd49f5c6f70031 Mon Sep 17 00:00:00 2001 From: Xie Yongji Date: Wed, 3 Aug 2022 12:55:19 +0800 Subject: vduse: Remove unnecessary spin lock protection Now we use domain->iotlb_lock to protect two different variables: domain->bounce_maps->bounce_page and domain->iotlb. But for domain->bounce_maps->bounce_page, we actually don't need any synchronization between vduse_domain_get_bounce_page() and vduse_domain_free_bounce_pages() since vduse_domain_get_bounce_page() will only be called in page fault handler and vduse_domain_free_bounce_pages() will be called during file release. So let's remove the unnecessary spin lock protection in vduse_domain_get_bounce_page(). Then the usage of domain->iotlb_lock could be more clear: the lock will be only used to protect the domain->iotlb. Signed-off-by: Xie Yongji Acked-by: Jason Wang Message-Id: <20220803045523.23851-2-xieyongji@bytedance.com> Signed-off-by: Michael S. Tsirkin --- drivers/vdpa/vdpa_user/iova_domain.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers/vdpa/vdpa_user') diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c index 6daa3978d290..bca1f0b8850c 100644 --- a/drivers/vdpa/vdpa_user/iova_domain.c +++ b/drivers/vdpa/vdpa_user/iova_domain.c @@ -211,17 +211,14 @@ static struct page * vduse_domain_get_bounce_page(struct vduse_iova_domain *domain, u64 iova) { struct vduse_bounce_map *map; - struct page *page = NULL; + struct page *page; - spin_lock(&domain->iotlb_lock); map = &domain->bounce_maps[iova >> PAGE_SHIFT]; if (!map->bounce_page) - goto out; + return NULL; page = map->bounce_page; get_page(page); -out: - spin_unlock(&domain->iotlb_lock); return page; } -- cgit v1.2.3