On Mon, 25 Jun 2007 01:08:23 -0700, <[EMAIL PROTECTED]> wrote:
> usb-add-urb_free_buffer-flag-and-the-logic-behind-it.patch
> +++ b/drivers/usb/core/urb.c
> @@ -13,6 +13,9 @@ static void urb_destroy(struct kref *kre
> {
> struct urb *urb = to_urb(kref);
>
> + if (urb->transfer_flags & URB_FREE_BUFFER)
> + kfree(urb->transfer_buffer);
> +
> kfree(urb);
I liked the constructors which kept the URB_FREE_BUFFER outside of grabby
little hands of drivers, but this is good too, I suppose. I'm going to
use this right away. Marcel, please let me know if I'm doing it wrong.
-- Pete
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -330,9 +330,6 @@ static void usblp_bulk_write(struct urb *urb)
wake_up(&usblp->wwait);
spin_unlock(&usblp->lock);
- /* XXX Use usb_setup_bulk_urb when available. Talk to Marcel. */
- kfree(urb->transfer_buffer);
- urb->transfer_buffer = NULL; /* Not refcounted, so to be safe... */
usb_free_urb(urb);
}
@@ -718,6 +715,7 @@ static ssize_t usblp_write(struct file *file, const char
__user *buffer, size_t
usb_sndbulkpipe(usblp->dev,
usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
writebuf, transfer_length, usblp_bulk_write, usblp);
+ writeurb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(writeurb, &usblp->urbs);
if (copy_from_user(writebuf,
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