linux-kernel - Re: [PATCH v3] EG20T: Update PCH

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Date:	Tue, 16 Nov 2010 13:34:00 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Mike Frysinger <vapier@...too.org>,
	Feng Tang <feng.tang@...el.com>,
	Tobias Klauser <tklauser@...tanz.ch>,
	linux-kernel@...r.kernel.org, yong.y.wang@...el.com,
	qi.wang@...el.com, kok.howg.ewe@...el.com,
	andrew.chih.howe.khor@...el.com
Subject: Re: [PATCH v3] EG20T: Update PCH_UART driver to 2.6.36

On Mon, 15 Nov 2010 21:26:03 +0900
Tomoya MORINAGA <tomoya-linux@....okisemi.com> wrote:

> Hi Alan,
> 
> I have modified for your all indications.
> 
> Please check below.

+static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
+		   int size)
+{
+	struct uart_port *port;
+	struct tty_struct *tty;
+	int sz, i, j;
+	int loop;
+	int pushed;
+
+	port = &priv->port;
+	tty = tty_port_tty_get(&port->state->port);
+	if (!tty) {
+		pr_debug("%s:tty is busy now", __func__);
+		return -EBUSY;
+	}
+
+	for (pushed = 0, i = 0, loop = 1; (pushed < size) && loop;
+	     pushed += sz, i++) {
+		sz = tty_insert_flip_string(tty, &buf[pushed], size - pushed);
+		for (j = 0; (j < 100000) && (sz == 0); j++) {
+			tty_flip_buffer_push(tty);
+			sz = tty_insert_flip_string(tty, &buf[pushed],
+						    size - pushed);
+		}
+	}

tty_insert_flip_string will deal with retries itself for the cases you have
here. So you shouldn't need the loop

+static int dma_push_rx(struct eg20t_port *priv, int size)
+{
+	struct tty_struct *tty;
+	int room;
+	struct uart_port *port = &priv->port;
+
+	port = &priv->port;
+	tty = tty_port_tty_get(&port->state->port);
+	if (!tty) {
+		pr_info("%s:tty is busy now", __func__);

As I said last time- this isn't an error or unusual so it shouldn't be
logged

+static void pch_dma_rx_complete(void *arg)
+{
+	struct eg20t_port *priv = arg;
+	struct uart_port *port = &priv->port;
+	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+	if (!tty) {
+		pr_info("%s:tty is busy now", __func__);

Same comment

Otherwise looks great.

Alan
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