drivers/rapidio/devices/rio_mport_cdev.c: fix error handling in 'rio_dma_transfer()'

In case of error, 'dma_map_sg()' returns 0, not a negative value.  There
is BUG_ON() in 'dma_map_sg_attrs()' which makes sure of that.

Link: http://lkml.kernel.org/r/d4235bd2b9274e99f6c86ea71b1fa1c7bd8d0c08.1505687047.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Alexandre Bounine <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Jesper Nilsson <[email protected]>
Cc: Christian K_nig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 86805747a422991dd12f91f3479c0f935e5686d7..dc5a33f936892ed32f29873d615995e505c53ed9 100644 (file)
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -961,7 +961,7 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
 
        nents = dma_map_sg(chan->device->dev,
                           req->sgt.sgl, req->sgt.nents, dir);
-       if (nents == -EFAULT) {
+       if (nents == 0) {
                rmcd_error("Failed to map SG list");
                ret = -EFAULT;
                goto err_pg;