[PATCH 4/6] linux: Translate linux iso pkt status codes to libusb transfer status codes

[Hans de Goede]

During testing of my usbredir code I hit a scenario where my libusb app
was seeing EXDEV as status in the transfer's iso_packet_desc

This happened because we don't translate linux negative errno errors
stored in iso pkts status to libusb transfer status codes at all! So this
patch adds translation for this.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 libusb/os/linux_usbfs.c |   36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
index f9fa4cd..d41aac8 100644
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -2079,7 +2079,41 @@ static int handle_iso_completion(struct usbi_transfer *itransfer,
 		struct usbfs_iso_packet_desc *urb_desc = &urb->iso_frame_desc[i];
 		struct libusb_iso_packet_descriptor *lib_desc =
 			&transfer->iso_packet_desc[tpriv->iso_packet_offset++];
-		lib_desc->status = urb_desc->status;
+		lib_desc->status = LIBUSB_TRANSFER_COMPLETED;
+		switch (urb_desc->status) {
+		case 0:
+			break;
+		case -ENOENT: /* cancelled */
+		case -ECONNRESET:
+			break;
+		case -ENODEV:
+		case -ESHUTDOWN:
+			usbi_dbg("device removed");
+			lib_desc->status = LIBUSB_TRANSFER_NO_DEVICE;
+			break;
+		case -EPIPE:
+			usbi_dbg("detected endpoint stall");
+			lib_desc->status = LIBUSB_TRANSFER_STALL;
+			break;
+		case -EOVERFLOW:
+			usbi_dbg("overflow error");
+			lib_desc->status = LIBUSB_TRANSFER_OVERFLOW;
+			break;
+		case -ETIME:
+		case -EPROTO:
+		case -EILSEQ:
+		case -ECOMM:
+		case -ENOSR:
+		case -EXDEV:
+			usbi_dbg("low-level USB error %d", urb_desc->status);
+			lib_desc->status = LIBUSB_TRANSFER_ERROR;
+			break;
+		default:
+			usbi_warn(TRANSFER_CTX(transfer),
+				"unrecognised urb status %d", urb_desc->status);
+			lib_desc->status = LIBUSB_TRANSFER_ERROR;
+			break;
+		}
 		lib_desc->actual_length = urb_desc->actual_length;
 	}
 
-- 
1.7.9.3