[PATCH] Add URB_FREE_BUFFER flag
Marcel Holtmann <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Hi Greg, here is the patch to add the URB_FREE_BUFFER flag for freeing the transfer buffer together with the URB itself. Please apply. Regards Marcel ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
patch-add-urb-free-buffer-option
(text/plain, 1.6 KB)
USB: Add URB_FREE_BUFFER flag for freeing the transfer buffer In some cases it is not needed that the driver keeps track of the transfer buffer of an URB. It can be simply freed along with the URB itself when the reference count goes down to zero. The new flag URB_FREE_BUFFER enables this behavior. Signed-off-by: Marcel Holtmann <[email protected]> --- commit f4ff5d567226679db52ddfa87b4fac9b8b81b5fd tree 78eca1748e58ea5fc587396dfbcd65858655aca8 parent dd14cbc994709a1c5a64ed3621f583c49a27e521 author Marcel Holtmann <[email protected]> Wed, 13 Jun 2007 07:00:43 +0200 committer Marcel Holtmann <[email protected]> Wed, 13 Jun 2007 07:00:43 +0200 drivers/usb/core/urb.c | 4 ++++ include/linux/usb.h | 1 + 2 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 94ea972..0601665 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -11,6 +11,10 @@ static void urb_destroy(struct kref *kref) { struct urb *urb = to_urb(kref); + + if (urb->transfer_flags & URB_FREE_BUFFER) + kfree(urb->transfer_buffer); + kfree(urb); } diff --git a/include/linux/usb.h b/include/linux/usb.h index 94bd38a..e751593 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -948,6 +948,7 @@ extern int usb_disabled(void); #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt * needed */ +#define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */ struct usb_iso_packet_descriptor { unsigned int offset;