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staging: vt6656: Fix non zero logical return of, usb_control_msg

Browse source 
commit 58c3e681b04dd57c70d0dcb7b69fe52d043ff75a upstream.

Starting with commit 59608cb1de
("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@vger.kernel.org> # v5.3+
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/08e88842-6f78-a2e3-a7a0-139fec960b2b@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2019-12-20 21:14:59 +00:00 • committed by Greg Kroah-Hartman
commit b062fb0ca0
1 changed files with 6 additions and 2 deletions
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8
drivers/staging/vt6656/usbpipe.c
View file

@ -59,7 +59,9 @@ int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
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 *priv, u8 request, u16 value,
kfree(usb_buffer);
if (ret >= 0 && ret < (int)length)
if (ret == (int)length)
ret = 0;
else
ret = -EIO;
end_unlock: