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Char: esp, remove hangup and wakeup bottomhalves 

There is no need to schedule a bottomhalf for either of them. One is fast
and the another schedules a bottomhalf itself.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby 2008-02-07 00:16:37 -08:00 committed by Linus Torvalds
parent 1386a820b3
commit d2e7a4b66d
2 changed files with 5 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/char/esp.c
View File

@ -242,17 +242,6 @@ static void rs_start(struct tty_struct *tty)
* -----------------------------------------------------------------------
*/
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static inline void rs_sched_event(struct esp_struct *info,
int event)
{
info->event |= 1 << event;
schedule_work(&info->tqueue);
}
static DEFINE_SPINLOCK(pio_lock);
static inline struct esp_pio_buffer *get_pio_buffer(void)
@ -474,7 +463,8 @@ static inline void transmit_chars_pio(struct esp_struct *info,
}
if (info->xmit_cnt < WAKEUP_CHARS) {
rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
if (info->tty)
tty_wakeup(info->tty);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
@ -512,7 +502,8 @@ static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
if (info->xmit_cnt < WAKEUP_CHARS) {
rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
if (info->tty)
tty_wakeup(info->tty);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
@ -604,7 +595,7 @@ static inline void check_modem_status(struct esp_struct *info)
#ifdef SERIAL_DEBUG_OPEN
printk("scheduling hangup...");
#endif
schedule_work(&info->tqueue_hangup);
tty_hangup(info->tty);
}
}
}
@ -720,41 +711,6 @@ static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
* -------------------------------------------------------------------
*/
static void do_softint(struct work_struct *work)
{
struct esp_struct *info =
container_of(work, struct esp_struct, tqueue);
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
tty_wakeup(tty);
}
}
/*
* This routine is called from the scheduler tqueue when the interrupt
* routine has signalled that a hangup has occurred. The path of
* hangup processing is:
*
* serial interrupt routine -> (scheduler tqueue) ->
* do_serial_hangup() -> tty->hangup() -> esp_hangup()
*
*/
static void do_serial_hangup(struct work_struct *work)
{
struct esp_struct *info =
container_of(work, struct esp_struct, tqueue_hangup);
struct tty_struct *tty;
tty = info->tty;
if (tty)
tty_hangup(tty);
}
/*
* ---------------------------------------------------------------
* Low level utility subroutines for the serial driver: routines to
@ -2038,7 +1994,6 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
info->event = 0;
info->tty = NULL;
if (info->blocked_open) {
@ -2106,7 +2061,6 @@ static void esp_hangup(struct tty_struct *tty)
rs_flush_buffer(tty);
shutdown(info);
info->event = 0;
info->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
info->tty = NULL;
@ -2492,8 +2446,6 @@ static int __init espserial_init(void)
info->magic = ESP_MAGIC;
info->close_delay = 5*HZ/10;
info->closing_wait = 30*HZ;
INIT_WORK(&info->tqueue, do_softint);
INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
info->config.rx_timeout = rx_timeout;
info->config.flow_on = flow_on;
info->config.flow_off = flow_off;

4
include/linux/hayesesp.h
View File

@ -71,7 +71,6 @@ struct hayes_esp_config {
#define ESP_STAT_NEVER_DMA 0x08
#define ESP_STAT_USE_PIO 0x10
#define ESP_EVENT_WRITE_WAKEUP 0
#define ESP_MAGIC 0x53ee
#define ESP_XMIT_SIZE 4096
@ -92,7 +91,6 @@ struct esp_struct {
unsigned short closing_wait2;
int IER; /* Interrupt Enable Register */
int MCR; /* Modem control register */
unsigned long event;
unsigned long last_active;
int line;
int count; /* # of fd on device */
@ -101,8 +99,6 @@ struct esp_struct {
int xmit_head;
int xmit_tail;
int xmit_cnt;
struct work_struct tqueue;
struct work_struct tqueue_hangup;
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
wait_queue_head_t delta_msr_wait;