There is an error when pin_user_pages_fast() returns -ERRNO and inside error handling path driver end up calling unpin_user_pages() with -ERRNO which is not correct.
This patch will fix the problem. Fixes: e8de370188d09 ("rapidio: add mport char device driver") Signed-off-by: Souptick Joarder <jrdr.li...@gmail.com> Cc: Ira Weiny <ira.we...@intel.com> Cc: John Hubbard <jhubb...@nvidia.com> Cc: Matthew Wilcox <wi...@infradead.org> --- drivers/rapidio/devices/rio_mport_cdev.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index a303429..163b6c72 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -871,15 +871,16 @@ static int do_dma_request(struct mport_dma_req *req, rmcd_error("pin_user_pages_fast err=%ld", pinned); nr_pages = 0; - } else + } else { rmcd_error("pinned %ld out of %ld pages", pinned, nr_pages); + /* + * Set nr_pages up to mean "how many pages to unpin, in + * the error handler: + */ + nr_pages = pinned; + } ret = -EFAULT; - /* - * Set nr_pages up to mean "how many pages to unpin, in - * the error handler: - */ - nr_pages = pinned; goto err_pg; } -- 1.9.1