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Subject[PATCH 1/6] Char: esp, remove hangup and wakeup bottomhalves
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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>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>

---
commit ee7ef7fcd70a75d11d05429e5ac7ac31aca381b1
tree d484eff41e6c6dde9835a48f91df59239b211f8d
parent da1c9104ea38d0ca6e5ce0ee9be8cb6adff0ee71
author Jiri Slaby <jirislaby@gmail.com> Mon, 05 Nov 2007 16:13:09 +0100
committer Jiri Slaby <jirislaby@gmail.com> Fri, 09 Nov 2007 22:41:51 +0100
drivers/char/esp.c | 58 ++++------------------------------------------
include/linux/hayesesp.h | 4 ---
2 files changed, 5 insertions(+), 57 deletions(-)
diff --git a/drivers/char/esp.c b/drivers/char/esp.c
index b5df2dc..c01e26d 100644
--- a/drivers/char/esp.c
+++ b/drivers/char/esp.c
@@ -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;
diff --git a/include/linux/hayesesp.h b/include/linux/hayesesp.h
index b436be7..2177ee5 100644
--- a/include/linux/hayesesp.h
+++ b/include/linux/hayesesp.h
@@ -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;
-
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