diff options
| -rw-r--r-- | io_uring/memmap.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/io_uring/memmap.c b/io_uring/memmap.c index 5d261e07c2e3..a37ccb167258 100644 --- a/io_uring/memmap.c +++ b/io_uring/memmap.c @@ -207,15 +207,23 @@ enum { IO_REGION_F_VMAP = 1, /* memory is provided by user and pinned by the kernel */ IO_REGION_F_USER_PROVIDED = 2, + /* only the first page in the array is ref'ed */ + IO_REGION_F_SINGLE_REF = 4, }; void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr) { if (mr->pages) { + long nr_refs = mr->nr_pages; + + if (mr->flags & IO_REGION_F_SINGLE_REF) + nr_refs = 1; + if (mr->flags & IO_REGION_F_USER_PROVIDED) - unpin_user_pages(mr->pages, mr->nr_pages); + unpin_user_pages(mr->pages, nr_refs); else - release_pages(mr->pages, mr->nr_pages); + release_pages(mr->pages, nr_refs); + kvfree(mr->pages); } if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr) |