enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/drivers/tty/pty.c
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@@ -100,7 +100,7 @@
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  *	pty_write		-	write to a pty
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  *	@tty: the tty we write from
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  *	@buf: kernel buffer of data
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- *	@count: bytes to write
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+ *	@c: bytes to write
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  *
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  *	Our "hardware" write method. Data is coming from the ldisc which
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  *	may be in a non sleeping state. We simply throw this at the other
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@@ -111,21 +111,11 @@
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 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
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 {
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 	struct tty_struct *to = tty->link;
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-	unsigned long flags;
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-	if (tty->stopped)
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+	if (tty->stopped || !c)
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 		return 0;
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-	if (c > 0) {
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-		spin_lock_irqsave(&to->port->lock, flags);
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-		/* Stuff the data into the input queue of the other end */
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-		c = tty_insert_flip_string(to->port, buf, c);
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-		spin_unlock_irqrestore(&to->port->lock, flags);
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-		/* And shovel */
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-		if (c)
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-			tty_flip_buffer_push(to->port);
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-	}
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-	return c;
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+	return tty_insert_flip_string_and_push_buffer(to->port, buf, c);
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 }
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 /**