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USB: usbfs: compute urb->actual_length for isochronous

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commit 2ef47001b3 upstream.

The USB kerneldoc says that the actual_length field "is read in
non-iso completion functions", but the usbfs driver uses it for all
URB types in processcompl().  Since not all of the host controller
drivers set actual_length for isochronous URBs, programs using usbfs
with some host controllers don't work properly.  For example, Minas
reports that a USB camera controlled by libusb doesn't work properly
with a dwc2 controller.

It doesn't seem worthwhile to change the HCDs and the documentation,
since the in-kernel USB class drivers evidently don't rely on
actual_length for isochronous transfers.  The easiest solution is for
usbfs to calculate the actual_length value for itself, by adding up
the lengths of the individual packets in an isochronous transfer.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Reported-and-tested-by: wlf <wulf@rock-chips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2017-11-08 12:23:17 -05:00
committed by Greg Kroah-Hartman
parent 11fdb41a1f
commit 87ff414178
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/core/devio.c
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@@ -1838,6 +1838,18 @@ static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
return 0;
}
static void compute_isochronous_actual_length(struct urb *urb)
{
unsigned int i;
if (urb->number_of_packets > 0) {
urb->actual_length = 0;
for (i = 0; i < urb->number_of_packets; i++)
urb->actual_length +=
urb->iso_frame_desc[i].actual_length;
}
}
static int processcompl(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
@@ -1845,6 +1857,7 @@ static int processcompl(struct async *as, void __user * __user *arg)
void __user *addr = as->userurb;
unsigned int i;
compute_isochronous_actual_length(urb);
if (as->userbuffer && urb->actual_length) {
if (copy_urb_data_to_user(as->userbuffer, urb))
goto err_out;
@@ -2019,6 +2032,7 @@ static int processcompl_compat(struct async *as, void __user * __user *arg)
void __user *addr = as->userurb;
unsigned int i;
compute_isochronous_actual_length(urb);
if (as->userbuffer && urb->actual_length) {
if (copy_urb_data_to_user(as->userbuffer, urb))
return -EFAULT;