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usb: gadgetfs: return number of bytes on ep0 read request 

A read from GadgetFS endpoint 0 during the data stage of a control
request would always return 0 on success (as returned by
wait_event_interruptible) despite having written data into the user
buffer.
This patch makes it correctly set the return value to the number of
bytes read.

Signed-off-by: Thomas Faber <thfabba@gmx.de>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Thomas Faber 2012-03-02 09:41:50 +01:00 committed by Greg Kroah-Hartman
parent 60b9bd8d16
commit 85b4b3c8c1
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/inode.c
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@ -1043,6 +1043,8 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
// FIXME don't call this with the spinlock held ...
if (copy_to_user (buf, dev->req->buf, len))
retval = -EFAULT;
else
retval = len;
clean_req (dev->gadget->ep0, dev->req);
/* NOTE userspace can't yet choose to stall */
}