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usb: gadget: f_ncm: remove timer_force_tx field 

It is simply not needed.  This field is equivalent to skb being NULL.

Currently with the boolean set to true we call:
  ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev);
which calls u_ether's:
  eth_start_xmit(NULL, ...)
which then calls:
  skb = dev->wrap(dev->port_usb, NULL);
which calls back into f_ncm's:
  ncm_wrap_ntb(..., NULL)

Cc: Brooke Basile <brookebasile@gmail.com>
Cc: "Bryan O'Donoghue" <bryan.odonoghue@linaro.org>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Link: https://lore.kernel.org/r/20210701114834.884597-1-zenczykowski@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maciej Żenczykowski 2021-07-01 04:48:29 -07:00 committed by Greg Kroah-Hartman
parent 091cb2f782
commit dbaaca9aa5
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/usb/gadget/function/f_ncm.c
View File

@ -72,7 +72,6 @@ struct f_ncm {
struct sk_buff *skb_tx_data;
struct sk_buff *skb_tx_ndp;
u16 ndp_dgram_count;
bool timer_force_tx;
struct hrtimer task_timer;
bool timer_stopping;
};
@ -1126,8 +1125,11 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
dev_consume_skb_any(skb);
skb = NULL;
} else if (ncm->skb_tx_data && ncm->timer_force_tx) {
/* If the tx was requested because of a timeout then send */
} else if (ncm->skb_tx_data) {
/* If we get here ncm_wrap_ntb() was called with NULL skb,
* because eth_start_xmit() was called with NULL skb by
* ncm_tx_timeout() - hence, this is our signal to flush/send.
*/
skb2 = package_for_tx(ncm);
if (!skb2)
goto err;
@ -1158,8 +1160,6 @@ static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
/* Only send if data is available. */
if (!ncm->timer_stopping && ncm->skb_tx_data) {
ncm->timer_force_tx = true;
/* XXX This allowance of a NULL skb argument to ndo_start_xmit
* XXX is not sane. The gadget layer should be redesigned so
* XXX that the dev->wrap() invocations to build SKBs is transparent
@ -1167,8 +1167,6 @@ static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
* XXX interface.
*/
ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev);
ncm->timer_force_tx = false;
}
return HRTIMER_NORESTART;
}