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[PATCH] USB: URB_ASYNC_UNLINK flag removed from the kernel

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29 July 2005, Cambridge, MA:

This afternoon Alan Stern submitted a patch to remove the URB_ASYNC_UNLINK
flag from the Linux kernel.  Mr. Stern explained, "This flag is a relic
from an earlier, less-well-designed system.  For over a year it hasn't
been used for anything other than printing warning messages."

An anonymous spokesman for the Linux kernel development community
commented, "This is exactly the sort of thing we see happening all the
time.  As the kernel evolves, support for old techniques and old code can
be jettisoned and replaced by newer, better approaches.  Proprietary
operating systems do not have the freedom or flexibility to change so
quickly."

Mr. Stern, a staff member at Harvard University's Rowland Institute who
works on Linux only as a hobby, noted that the patch (labelled as548) did
not update two files, keyspan.c and option.c, in the USB drivers' "serial"
subdirectory.  "Those files need more extensive changes," he remarked.
"They examine the status field of several URBs at times when they're not
supposed to.  That will need to be fixed before the URB_ASYNC_UNLINK flag
is removed."

Greg Kroah-Hartman, the kernel maintainer responsible for overseeing all
of Linux's USB drivers, did not respond to our inquiries or return our
calls.  His only comment was "Applied, thanks."

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2005-07-29 16:11:07 -04:00
committed by Greg Kroah-Hartman
parent a4e628328e
commit b375a0495f
18 changed files with 25 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/misc/auerswald.c
View File

@@ -426,7 +426,7 @@ static int auerchain_submit_urb (pauerchain_t acp, struct urb * urb)
/* cancel an urb which is submitted to the chain
the result is 0 if the urb is cancelled, or -EINPROGRESS if
URB_ASYNC_UNLINK is set and the function is successfully started.
the function is successfully started.
*/
static int auerchain_unlink_urb (pauerchain_t acp, struct urb * urb)
{
@@ -515,7 +515,6 @@ static void auerchain_unlink_all (pauerchain_t acp)
acep = acp->active;
if (acep) {
urbp = acep->urbp;
urbp->transfer_flags &= ~URB_ASYNC_UNLINK;
dbg ("unlink active urb");
usb_kill_urb (urbp);
}

4
drivers/usb/misc/sisusbvga/sisusb.c
View File

@@ -229,7 +229,7 @@ sisusb_bulkout_msg(struct sisusb_usb_data *sisusb, int index, unsigned int pipe,
usb_fill_bulk_urb(urb, sisusb->sisusb_dev, pipe, data, len,
sisusb_bulk_completeout, &sisusb->urbout_context[index]);
urb->transfer_flags |= (tflags | URB_ASYNC_UNLINK);
urb->transfer_flags |= tflags;
urb->actual_length = 0;
if ((urb->transfer_dma = transfer_dma))
@@ -295,7 +295,7 @@ sisusb_bulkin_msg(struct sisusb_usb_data *sisusb, unsigned int pipe, void *data,
usb_fill_bulk_urb(urb, sisusb->sisusb_dev, pipe, data, len,
sisusb_bulk_completein, sisusb);
urb->transfer_flags |= (tflags | URB_ASYNC_UNLINK);
urb->transfer_flags |= tflags;
urb->actual_length = 0;
if ((urb->transfer_dma = transfer_dma))

2
drivers/usb/misc/usbtest.c
View File

@@ -986,7 +986,6 @@ test_ctrl_queue (struct usbtest_dev *dev, struct usbtest_param *param)
u->context = &context;
u->complete = ctrl_complete;
u->transfer_flags |= URB_ASYNC_UNLINK;
}
/* queue the urbs */
@@ -1052,7 +1051,6 @@ static int unlink1 (struct usbtest_dev *dev, int pipe, int size, int async)
urb = simple_alloc_urb (testdev_to_usbdev (dev), pipe, size);
if (!urb)
return -ENOMEM;
urb->transfer_flags |= URB_ASYNC_UNLINK;
urb->context = &completion;
urb->complete = unlink1_callback;