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charset="utf-8" [ Upstream commit 166d3863231667c4f64dee72b77d1102cdfad11f ] The error paths of gntdev_mmap() can call unmap_grant_pages() even though not all of the pages have been successfully mapped. This will trigger the WARN_ON()s in __unmap_grant_pages_done(). The number of warnings can be very large; I have observed thousands of lines of warnings in the systemd journal. Avoid this problem by only warning on unmapping failure if the handle being unmapped is not -1. The handle field of any page that was not successfully mapped will be -1, so this catches all cases where unmapping can legitimately fail. Suggested-by: Juergen Gross Cc: stable@vger.kernel.org Signed-off-by: Demi Marie Obenour Fixes: 73e9e72247b9 ("xen/gntdev: Avoid blocking in unmap_grant_pages()") --- drivers/xen/gntdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 492084814f55d8ed46d2d656db75b28a91dd7f06..27d955c5d9f9076266f77b9fedf= a1a6a2ba08f56 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -416,7 +416,8 @@ static void __unmap_grant_pages_done(int result, unsigned int offset =3D data->unmap_ops - map->unmap_ops; =20 for (i =3D 0; i < data->count; i++) { - WARN_ON(map->unmap_ops[offset+i].status); + WARN_ON(map->unmap_ops[offset+i].status && + map->unmap_ops[offset+i].handle !=3D -1); pr_debug("unmap handle=3D%d st=3D%d\n", map->unmap_ops[offset+i].handle, map->unmap_ops[offset+i].status); --=20 Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab