dma_map_sg return 0 on error. Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Cc: Kishon Vijay Abraham I <kishon@xxxxxx> Cc: Alexey Sheplyakov <asheplyakov@xxxxxxxxxx> Cc: Stephen Boyd <swboyd@xxxxxxxxxxxx> Cc: Weitao Wang <WeitaoWang-oc@xxxxxxxxxxx> Cc: Matthias Kaehlcke <mka@xxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: linux-usb@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx> --- drivers/usb/core/hcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 94b305bbd621..90dd32a24e5b 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1474,7 +1474,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, urb->sg, urb->num_sgs, dir); - if (n <= 0) + if (!n) ret = -EAGAIN; else urb->transfer_flags |= URB_DMA_MAP_SG; -- 2.34.1
