jsm: Remove further unneeded crud

Remove some remaining vestiges of the old hacks jsm had to work around the old
tty buffering.  With the new tty buffering it simply doesn't matter any more.

[michal.k.k.piotrowski@gmail.com: fix warning]
Signed-off-by: NAlan Cox <alan@redhat.com>
Acked-by: NScott Kilau <scottk@digi.com>
Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/serial/jsm/jsm_tty.c

@@ -500,13 +500,11 @@ void jsm_input(struct jsm_channel *ch)
 {
 	struct jsm_board *bd;
 	struct tty_struct *tp;
-	struct tty_ldisc *ld;
 	u32 rmask;
 	u16 head;
 	u16 tail;
 	int data_len;
 	unsigned long lock_flags;
-	int flip_len = 0;
 	int len = 0;
 	int n = 0;
 	int s = 0;
@@ -574,45 +572,13 @@ void jsm_input(struct jsm_channel *ch)
 
 	jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n");
 
-	/*
-	 * If the rxbuf is empty and we are not throttled, put as much
-	 * as we can directly into the linux TTY buffer.
-	 *
-	 */
-	flip_len = TTY_FLIPBUF_SIZE;
-
-	len = min(data_len, flip_len);
-	len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt);
-	ld = tty_ldisc_ref(tp);
-
-	/*
-	 * If we were unable to get a reference to the ld,
-	 * don't flush our buffer, and act like the ld doesn't
-	 * have any space to put the data right now.
-	 */
-	if (!ld) {
-		len = 0;
-	} else {
-		/*
-		 * If ld doesn't have a pointer to a receive_buf function,
-		 * flush the data, then act like the ld doesn't have any
-		 * space to put the data right now.
-		 */
-		if (!ld->receive_buf) {
-				ch->ch_r_head = ch->ch_r_tail;
-				len = 0;
-		}
-	}
-
-	if (len <= 0) {
+	if (data_len <= 0) {
 		spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
 		jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
-		if (ld)
-			tty_ldisc_deref(ld);
 		return;
 	}
 
-	len = tty_buffer_request_room(tp, len);
+	len = tty_buffer_request_room(tp, data_len);
 	n = len;
 
 	/*
@@ -647,7 +613,7 @@ void jsm_input(struct jsm_channel *ch)
 				else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
 					tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME);
 				else
-				tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
+					tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
 			}
 		} else {
 			tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ;
@@ -666,9 +632,6 @@ void jsm_input(struct jsm_channel *ch)
 	/* Tell the tty layer its okay to "eat" the data now */
 	tty_flip_buffer_push(tp);
 
-	if (ld)
-		tty_ldisc_deref(ld);
-
 	jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
 }