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authorJames Hogan <james.hogan@imgtec.com>2013-02-06 14:45:02 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-06 11:10:17 -0800
commita8cd98586b1f9e3b5dd7e141bcfe8f078fbb39ed (patch)
treee442817ff8461de7925e9d77e043eb3e8070c9cb /drivers/tty
parent8200e38a0cbf95dd2acaa565badb9b6a71c0e9c3 (diff)
tty: metag_da: avoid getting tty kref in dashtty_timer()
Getting the tty kref in dashtty_timer() is no longer necessary since it isn't needed in fetch_data() any longer (due to changes which make the tty flip functions refer to tty_ports instead of tty_structs), so just pass around a channel number instead. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/metag_da.c31
1 files changed, 14 insertions, 17 deletions
diff --git a/drivers/tty/metag_da.c b/drivers/tty/metag_da.c
index fc2a36bddd3..0e888621f48 100644
--- a/drivers/tty/metag_da.c
+++ b/drivers/tty/metag_da.c
@@ -147,9 +147,8 @@ static int chancall(int in_bios_function, int in_channel,
/*
* Attempts to fetch count bytes from channel and returns actual count.
*/
-static int fetch_data(struct tty_struct *tty)
+static int fetch_data(unsigned int channel)
{
- unsigned int channel = tty->index;
struct dashtty_port *dport = &dashtty_ports[channel];
int received = 0;
@@ -180,31 +179,31 @@ unlock:
}
/**
- * find_channel_to_poll() - Returns kref to the next channel tty to poll.
- * Returns: The TTY of the next channel to poll, or NULL if no TTY needs
- * polling. Release with tty_kref_put().
+ * find_channel_to_poll() - Returns number of the next channel to poll.
+ * Returns: The number of the next channel to poll, or -1 if none need
+ * polling.
*/
-static struct tty_struct *find_channel_to_poll(void)
+static int find_channel_to_poll(void)
{
static int last_polled_channel;
int last = last_polled_channel;
int chan;
- struct tty_struct *tty = NULL;
+ struct dashtty_port *dport;
for (chan = last + 1; ; ++chan) {
if (chan >= NUM_TTY_CHANNELS)
chan = 0;
- tty = tty_port_tty_get(&dashtty_ports[chan].port);
- if (tty) {
+ dport = &dashtty_ports[chan];
+ if (dport->rx_buf) {
last_polled_channel = chan;
- return tty;
+ return chan;
}
if (chan == last)
break;
}
- return tty;
+ return -1;
}
/**
@@ -302,19 +301,17 @@ static int put_data(void *arg)
*/
static void dashtty_timer(unsigned long ignored)
{
- struct tty_struct *tty;
+ int channel;
/* If there are no ports open do nothing and don't poll again. */
if (!atomic_read(&num_channels_need_poll))
return;
- tty = find_channel_to_poll();
+ channel = find_channel_to_poll();
/* Did we find a channel to poll? */
- if (tty) {
- fetch_data(tty);
- tty_kref_put(tty);
- }
+ if (channel >= 0)
+ fetch_data(channel);
mod_timer_pinned(&poll_timer, jiffies + DA_TTY_POLL);
}