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usb/gadget/NCM: Replace tasklet with softirq hrtimer

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The tx_tasklet tasklet is used in invoke the hrtimer (task_timer) in
softirq context. This can be also achieved without the tasklet but
with HRTIMER_MODE_SOFT as hrtimer mode.

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Anna-Maria Gleixner <[email protected]>
Acked-by: Felipe Balbi <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Thomas Gleixner 2017-12-21 11:42:04 +01:00 • committed by Ingo Molnar
commit b1a31a5f5f
1 changed files with 7 additions and 23 deletions
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30
drivers/usb/gadget/function/f_ncm.c
View file

@ -73,9 +73,7 @@ struct f_ncm {
struct sk_buff *skb_tx_ndp;
u16 ndp_dgram_count;
bool timer_force_tx;
struct tasklet_struct tx_tasklet;
struct hrtimer task_timer;
bool timer_stopping;
};
@ -1104,7 +1102,7 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
/* Delay the timer. */
hrtimer_start(&ncm->task_timer, TX_TIMEOUT_NSECS,
HRTIMER_MODE_REL);
HRTIMER_MODE_REL_SOFT);
/* Add the datagram position entries */
ntb_ndp = skb_put_zero(ncm->skb_tx_ndp, dgram_idx_len);
@ -1148,17 +1146,15 @@ err:
}
/*
* This transmits the NTB if there are frames waiting.
* The transmit should only be run if no skb data has been sent
* for a certain duration.
*/
static void ncm_tx_tasklet(unsigned long data)
static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
{
struct f_ncm *ncm = (void *)data;
if (ncm->timer_stopping)
return;
struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
/* Only send if data is available. */
if (ncm->skb_tx_data) {
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
@ -1171,16 +1167,6 @@ static void ncm_tx_tasklet(unsigned long data)
ncm->timer_force_tx = false;
}
}
/*
* The transmit should only be run if no skb data has been sent
* for a certain duration.
*/
static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
{
struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
tasklet_schedule(&ncm->tx_tasklet);
return HRTIMER_NORESTART;
}
@ -1513,8 +1499,7 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
ncm->port.open = ncm_open;
ncm->port.close = ncm_close;
tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm);
hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
ncm->task_timer.function = ncm_tx_timeout;
DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
@ -1623,7 +1608,6 @@ static void ncm_unbind(struct usb_configuration *c, struct usb_function *f)
DBG(c->cdev, "ncm unbind\n");
hrtimer_cancel(&ncm->task_timer);
tasklet_kill(&ncm->tx_tasklet);
ncm_string_defs[0].id = 0;
usb_free_all_descriptors(f);