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| author | Jan Beulich <jbeulich@suse.com> | 2021-02-23 19:26:21 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2021-02-23 21:35:43 +0300 |
| commit | 53f131c284e83c29c227c0938926a82b2ed4d7ba (patch) | |
| tree | ad3d63a366e03c78ad560c0b6a4e3d3b3f92bd6e /drivers/xen | |
| parent | 43135df0d7f0a66c75143a1e95ed70a2005ca329 (diff) | |
| download | linux-53f131c284e83c29c227c0938926a82b2ed4d7ba.tar.xz | |
xen-front-pgdir-shbuf: don't record wrong grant handle upon error
In order for subsequent unmapping to not mistakenly unmap handle 0,
record a perceived always-invalid one instead.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Link: https://lore.kernel.org/r/82414b0f-1b63-5509-7c1d-5bcc8239a3de@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xen-front-pgdir-shbuf.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/xen/xen-front-pgdir-shbuf.c b/drivers/xen/xen-front-pgdir-shbuf.c index 48a658dc7ccf..81b6e13fa5ec 100644 --- a/drivers/xen/xen-front-pgdir-shbuf.c +++ b/drivers/xen/xen-front-pgdir-shbuf.c @@ -305,11 +305,18 @@ static int backend_map(struct xen_front_pgdir_shbuf *buf) /* Save handles even if error, so we can unmap. */ for (cur_page = 0; cur_page < buf->num_pages; cur_page++) { - buf->backend_map_handles[cur_page] = map_ops[cur_page].handle; - if (unlikely(map_ops[cur_page].status != GNTST_okay)) + if (likely(map_ops[cur_page].status == GNTST_okay)) { + buf->backend_map_handles[cur_page] = + map_ops[cur_page].handle; + } else { + buf->backend_map_handles[cur_page] = + INVALID_GRANT_HANDLE; + if (!ret) + ret = -ENXIO; dev_err(&buf->xb_dev->dev, "Failed to map page %d: %d\n", cur_page, map_ops[cur_page].status); + } } if (ret) { |