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Subject[PATCH 08/69] TTY: isdn, make some functions readable
Date
Huh, this was a mess.

* Remove the 5 indent levels by just returning from isdn_tty_try_read
when the conditions there are not satisfied.
* Use 'continue' in loop in isdn_tty_readmodem to save 2 levels.
* Chain 'if's in isdn_tty_modem_escape.
* Use 'continue' in loop in isdn_tty_carrier_timeout to save 1 level.

Better to look at this patch with -w -b.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Karsten Keil <isdn@linux-pingi.de>
---
drivers/isdn/i4l/isdn_tty.c | 178 ++++++++++++++++++++++---------------------
1 file changed, 93 insertions(+), 85 deletions(-)
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 1ff3072..74b0518 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -65,49 +65,54 @@ isdn_tty_try_read(modem_info *info, struct sk_buff *skb)
struct tty_struct *tty;
char last;

- if (info->online) {
- if ((tty = info->tty)) {
- if (info->mcr & UART_MCR_RTS) {
- len = skb->len
+ if (!info->online)
+ return 0;
+
+ tty = info->tty;
+ if (!tty)
+ return 0;
+
+ if (!(info->mcr & UART_MCR_RTS))
+ return 0;
+
+ len = skb->len
#ifdef CONFIG_ISDN_AUDIO
- + ISDN_AUDIO_SKB_DLECOUNT(skb)
+ + ISDN_AUDIO_SKB_DLECOUNT(skb)
#endif
- ;
+ ;
+
+ c = tty_buffer_request_room(tty, len);
+ if (c < len)
+ return 0;

- c = tty_buffer_request_room(tty, len);
- if (c >= len) {
-#ifdef CONFIG_ISDN_AUDIO
- if (ISDN_AUDIO_SKB_DLECOUNT(skb)) {
- int l = skb->len;
- unsigned char *dp = skb->data;
- while (--l) {
- if (*dp == DLE)
- tty_insert_flip_char(tty, DLE, 0);
- tty_insert_flip_char(tty, *dp++, 0);
- }
- if (*dp == DLE)
- tty_insert_flip_char(tty, DLE, 0);
- last = *dp;
- } else {
-#endif
- if (len > 1)
- tty_insert_flip_string(tty, skb->data, len - 1);
- last = skb->data[len - 1];
#ifdef CONFIG_ISDN_AUDIO
- }
+ if (ISDN_AUDIO_SKB_DLECOUNT(skb)) {
+ int l = skb->len;
+ unsigned char *dp = skb->data;
+ while (--l) {
+ if (*dp == DLE)
+ tty_insert_flip_char(tty, DLE, 0);
+ tty_insert_flip_char(tty, *dp++, 0);
+ }
+ if (*dp == DLE)
+ tty_insert_flip_char(tty, DLE, 0);
+ last = *dp;
+ } else {
#endif
- if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
- tty_insert_flip_char(tty, last, 0xFF);
- else
- tty_insert_flip_char(tty, last, TTY_NORMAL);
- tty_flip_buffer_push(tty);
- kfree_skb(skb);
- return 1;
- }
- }
- }
+ if (len > 1)
+ tty_insert_flip_string(tty, skb->data, len - 1);
+ last = skb->data[len - 1];
+#ifdef CONFIG_ISDN_AUDIO
}
- return 0;
+#endif
+ if (info->emu.mdmreg[REG_CPPP] & BIT_CPPP)
+ tty_insert_flip_char(tty, last, 0xFF);
+ else
+ tty_insert_flip_char(tty, last, TTY_NORMAL);
+ tty_flip_buffer_push(tty);
+ kfree_skb(skb);
+
+ return 1;
}

/* isdn_tty_readmodem() is called periodically from within timer-interrupt.
@@ -125,35 +130,39 @@ isdn_tty_readmodem(void)
modem_info *info;

for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
- if ((midx = dev->m_idx[i]) >= 0) {
- info = &dev->mdm.info[midx];
- if (info->online) {
- r = 0;
+ midx = dev->m_idx[i];
+ if (midx < 0)
+ continue;
+
+ info = &dev->mdm.info[midx];
+ if (!info->online)
+ continue;
+
+ r = 0;
#ifdef CONFIG_ISDN_AUDIO
- isdn_audio_eval_dtmf(info);
- if ((info->vonline & 1) && (info->emu.vpar[1]))
- isdn_audio_eval_silence(info);
-#endif
- if ((tty = info->tty)) {
- if (info->mcr & UART_MCR_RTS) {
- /* CISCO AsyncPPP Hack */
- if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
- r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 0);
- else
- r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 1);
- if (r)
- tty_flip_buffer_push(tty);
- } else
- r = 1;
- } else
- r = 1;
- if (r) {
- info->rcvsched = 0;
- resched = 1;
- } else
- info->rcvsched = 1;
- }
- }
+ isdn_audio_eval_dtmf(info);
+ if ((info->vonline & 1) && (info->emu.vpar[1]))
+ isdn_audio_eval_silence(info);
+#endif
+ tty = info->tty;
+ if (tty) {
+ if (info->mcr & UART_MCR_RTS) {
+ /* CISCO AsyncPPP Hack */
+ if (!(info->emu.mdmreg[REG_CPPP] & BIT_CPPP))
+ r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 0);
+ else
+ r = isdn_readbchan_tty(info->isdn_driver, info->isdn_channel, tty, 1);
+ if (r)
+ tty_flip_buffer_push(tty);
+ } else
+ r = 1;
+ } else
+ r = 1;
+ if (r) {
+ info->rcvsched = 0;
+ resched = 1;
+ } else
+ info->rcvsched = 1;
}
if (!resched)
isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
@@ -3769,19 +3778,19 @@ isdn_tty_modem_escape(void)
int midx;

for (i = 0; i < ISDN_MAX_CHANNELS; i++)
- if (USG_MODEM(dev->usage[i]))
- if ((midx = dev->m_idx[i]) >= 0) {
- modem_info *info = &dev->mdm.info[midx];
- if (info->online) {
- ton = 1;
- if ((info->emu.pluscount == 3) &&
- time_after(jiffies , info->emu.lastplus + PLUSWAIT2)) {
- info->emu.pluscount = 0;
- info->online = 0;
- isdn_tty_modem_result(RESULT_OK, info);
- }
+ if (USG_MODEM(dev->usage[i]) && (midx = dev->m_idx[i]) >= 0) {
+ modem_info *info = &dev->mdm.info[midx];
+ if (info->online) {
+ ton = 1;
+ if ((info->emu.pluscount == 3) &&
+ time_after(jiffies,
+ info->emu.lastplus + PLUSWAIT2)) {
+ info->emu.pluscount = 0;
+ info->online = 0;
+ isdn_tty_modem_result(RESULT_OK, info);
}
}
+ }
isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, ton);
}

@@ -3839,15 +3848,14 @@ isdn_tty_carrier_timeout(void)

for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
modem_info *info = &dev->mdm.info[i];
- if (info->dialing) {
- if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
- info->dialing = 0;
- isdn_tty_modem_result(RESULT_NO_CARRIER, info);
- isdn_tty_modem_hup(info, 1);
- }
- else
- ton = 1;
- }
+ if (!info->dialing)
+ continue;
+ if (info->emu.carrierwait++ > info->emu.mdmreg[REG_WAITC]) {
+ info->dialing = 0;
+ isdn_tty_modem_result(RESULT_NO_CARRIER, info);
+ isdn_tty_modem_hup(info, 1);
+ } else
+ ton = 1;
}
isdn_timer_ctrl(ISDN_TIMER_CARRIER, ton);
}
--
1.7.9.2



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