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path: root/arch/um/drivers/chan_kern.c
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Diffstat (limited to 'arch/um/drivers/chan_kern.c')
-rw-r--r--arch/um/drivers/chan_kern.c198
1 files changed, 88 insertions, 110 deletions
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 420e2c80079..ca4c7ebfd0a 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -140,18 +140,18 @@ static int open_chan(struct list_head *chans)
return err;
}
-void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
+void chan_enable_winch(struct chan *chan, struct tty_struct *tty)
{
- struct list_head *ele;
- struct chan *chan;
+ if (chan && chan->primary && chan->ops->winch)
+ register_winch(chan->fd, tty);
+}
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
- if (chan->primary && chan->output && chan->ops->winch) {
- register_winch(chan->fd, tty);
- return;
- }
- }
+static void line_timer_cb(struct work_struct *work)
+{
+ struct line *line = container_of(work, struct line, task.work);
+
+ if (!line->throttled)
+ chan_interrupt(line, line->tty, line->driver->read_irq);
}
int enable_chan(struct line *line)
@@ -160,6 +160,8 @@ int enable_chan(struct line *line)
struct chan *chan;
int err;
+ INIT_DELAYED_WORK(&line->task, line_timer_cb);
+
list_for_each(ele, &line->chan_list) {
chan = list_entry(ele, struct chan, list);
err = open_one_chan(chan);
@@ -183,7 +185,7 @@ int enable_chan(struct line *line)
return 0;
out_close:
- close_chan(&line->chan_list, 0);
+ close_chan(line);
return err;
}
@@ -244,7 +246,7 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
chan->fd = -1;
}
-void close_chan(struct list_head *chans, int delay_free_irq)
+void close_chan(struct line *line)
{
struct chan *chan;
@@ -253,77 +255,50 @@ void close_chan(struct list_head *chans, int delay_free_irq)
* state. Then, the first one opened will have the original state,
* so it must be the last closed.
*/
- list_for_each_entry_reverse(chan, chans, list) {
- close_one_chan(chan, delay_free_irq);
+ list_for_each_entry_reverse(chan, &line->chan_list, list) {
+ close_one_chan(chan, 0);
}
}
-void deactivate_chan(struct list_head *chans, int irq)
+void deactivate_chan(struct chan *chan, int irq)
{
- struct list_head *ele;
-
- struct chan *chan;
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
-
- if (chan->enabled && chan->input)
- deactivate_fd(chan->fd, irq);
- }
+ if (chan && chan->enabled)
+ deactivate_fd(chan->fd, irq);
}
-void reactivate_chan(struct list_head *chans, int irq)
+void reactivate_chan(struct chan *chan, int irq)
{
- struct list_head *ele;
- struct chan *chan;
-
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
-
- if (chan->enabled && chan->input)
- reactivate_fd(chan->fd, irq);
- }
+ if (chan && chan->enabled)
+ reactivate_fd(chan->fd, irq);
}
-int write_chan(struct list_head *chans, const char *buf, int len,
+int write_chan(struct chan *chan, const char *buf, int len,
int write_irq)
{
- struct list_head *ele;
- struct chan *chan = NULL;
int n, ret = 0;
- if (len == 0)
+ if (len == 0 || !chan || !chan->ops->write)
return 0;
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
- if (!chan->output || (chan->ops->write == NULL))
- continue;
-
- n = chan->ops->write(chan->fd, buf, len, chan->data);
- if (chan->primary) {
- ret = n;
- if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
- reactivate_fd(chan->fd, write_irq);
- }
+ n = chan->ops->write(chan->fd, buf, len, chan->data);
+ if (chan->primary) {
+ ret = n;
+ if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
+ reactivate_fd(chan->fd, write_irq);
}
return ret;
}
-int console_write_chan(struct list_head *chans, const char *buf, int len)
+int console_write_chan(struct chan *chan, const char *buf, int len)
{
- struct list_head *ele;
- struct chan *chan;
int n, ret = 0;
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
- if (!chan->output || (chan->ops->console_write == NULL))
- continue;
+ if (!chan || !chan->ops->console_write)
+ return 0;
- n = chan->ops->console_write(chan->fd, buf, len);
- if (chan->primary)
- ret = n;
- }
+ n = chan->ops->console_write(chan->fd, buf, len);
+ if (chan->primary)
+ ret = n;
return ret;
}
@@ -340,20 +315,24 @@ int console_open_chan(struct line *line, struct console *co)
return 0;
}
-int chan_window_size(struct list_head *chans, unsigned short *rows_out,
+int chan_window_size(struct line *line, unsigned short *rows_out,
unsigned short *cols_out)
{
- struct list_head *ele;
struct chan *chan;
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
- if (chan->primary) {
- if (chan->ops->window_size == NULL)
- return 0;
- return chan->ops->window_size(chan->fd, chan->data,
- rows_out, cols_out);
- }
+ chan = line->chan_in;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
+ }
+ chan = line->chan_out;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
}
return 0;
}
@@ -429,21 +408,15 @@ static int chan_pair_config_string(struct chan *in, struct chan *out,
return n;
}
-int chan_config_string(struct list_head *chans, char *str, int size,
+int chan_config_string(struct line *line, char *str, int size,
char **error_out)
{
- struct list_head *ele;
- struct chan *chan, *in = NULL, *out = NULL;
+ struct chan *in = line->chan_in, *out = line->chan_out;
- list_for_each(ele, chans) {
- chan = list_entry(ele, struct chan, list);
- if (!chan->primary)
- continue;
- if (chan->input)
- in = chan;
- if (chan->output)
- out = chan;
- }
+ if (in && !in->primary)
+ in = NULL;
+ if (out && !out->primary)
+ out = NULL;
return chan_pair_config_string(in, out, str, size, error_out);
}
@@ -547,10 +520,14 @@ int parse_chan_pair(char *str, struct line *line, int device,
char *in, *out;
if (!list_empty(chans)) {
+ line->chan_in = line->chan_out = NULL;
free_chan(chans);
INIT_LIST_HEAD(chans);
}
+ if (!str)
+ return 0;
+
out = strchr(str, ',');
if (out != NULL) {
in = str;
@@ -562,6 +539,7 @@ int parse_chan_pair(char *str, struct line *line, int device,
new->input = 1;
list_add(&new->list, chans);
+ line->chan_in = new;
new = parse_chan(line, out, device, opts, error_out);
if (new == NULL)
@@ -569,6 +547,7 @@ int parse_chan_pair(char *str, struct line *line, int device,
list_add(&new->list, chans);
new->output = 1;
+ line->chan_out = new;
}
else {
new = parse_chan(line, str, device, opts, error_out);
@@ -578,43 +557,42 @@ int parse_chan_pair(char *str, struct line *line, int device,
list_add(&new->list, chans);
new->input = 1;
new->output = 1;
+ line->chan_in = line->chan_out = new;
}
return 0;
}
-void chan_interrupt(struct list_head *chans, struct delayed_work *task,
- struct tty_struct *tty, int irq)
+void chan_interrupt(struct line *line, struct tty_struct *tty, int irq)
{
- struct list_head *ele, *next;
- struct chan *chan;
+ struct chan *chan = line->chan_in;
int err;
char c;
- list_for_each_safe(ele, next, chans) {
- chan = list_entry(ele, struct chan, list);
- if (!chan->input || (chan->ops->read == NULL))
- continue;
- do {
- if (tty && !tty_buffer_request_room(tty, 1)) {
- schedule_delayed_work(task, 1);
- goto out;
- }
- err = chan->ops->read(chan->fd, &c, chan->data);
- if (err > 0)
- tty_receive_char(tty, c);
- } while (err > 0);
-
- if (err == 0)
- reactivate_fd(chan->fd, irq);
- if (err == -EIO) {
- if (chan->primary) {
- if (tty != NULL)
- tty_hangup(tty);
- close_chan(chans, 1);
- return;
- }
- else close_one_chan(chan, 1);
+ if (!chan || !chan->ops->read)
+ goto out;
+
+ do {
+ if (tty && !tty_buffer_request_room(tty, 1)) {
+ schedule_delayed_work(&line->task, 1);
+ goto out;
}
+ err = chan->ops->read(chan->fd, &c, chan->data);
+ if (err > 0)
+ tty_receive_char(tty, c);
+ } while (err > 0);
+
+ if (err == 0)
+ reactivate_fd(chan->fd, irq);
+ if (err == -EIO) {
+ if (chan->primary) {
+ if (tty != NULL)
+ tty_hangup(tty);
+ if (line->chan_out != chan)
+ close_one_chan(line->chan_out, 1);
+ }
+ close_one_chan(chan, 1);
+ if (chan->primary)
+ return;
}
out:
if (tty)