From: Malcolm Priestley <tvboxspy@xxxxxxxxx>
commit 58c3e681b04dd57c70d0dcb7b69fe52d043ff75a upstream.
Starting with commit 59608cb1de1856
("staging: vt6656: clean function's error path in usbpipe.c")
the usb control functions have returned errors throughout driver
with only logical variable checking.
However, usb_control_msg return the amount of bytes transferred
this means that normal operation causes errors.
Correct the return function so only return zero when transfer
is successful.
Cc: stable <stable@xxxxxxxxxxxxxxx> # v5.3+
Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
Link: https://lore.kernel.org/r/08e88842-6f78-a2e3-a7a0-139fec960b2b@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/vt6656/usbpipe.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/staging/vt6656/usbpipe.c
+++ b/drivers/staging/vt6656/usbpipe.c
@@ -59,7 +59,9 @@ int vnt_control_out(struct vnt_private *
kfree(usb_buffer);
- if (ret >= 0 && ret < (int)length)
+ if (ret == (int)length)
+ ret = 0;
+ else
ret = -EIO;
end_unlock:
@@ -103,7 +105,9 @@ int vnt_control_in(struct vnt_private *p
kfree(usb_buffer);
- if (ret >= 0 && ret < (int)length)
+ if (ret == (int)length)
+ ret = 0;
+ else
ret = -EIO;
end_unlock:
