From: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
Add framework to allow serial driver to fixup state after operating in
polled mode, before returning to interrupt mode.
Not-signed-off-by-yet: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
---
drivers/tty/serial/kgdboc.c | 3 +++
drivers/tty/serial/serial_core.c | 15 +++++++++++++++
include/linux/serial_core.h | 1 +
include/linux/tty_driver.h | 1 +
4 files changed, 20 insertions(+)
Index: b/drivers/tty/serial/kgdboc.c
===================================================================
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -302,6 +302,9 @@ static void kgdboc_post_exp_handler(void
con_debug_leave();
}
kgdboc_restore_input();
+
+ if (kgdb_tty_driver->ops->poll_post_exception)
+ kgdb_tty_driver->ops->poll_post_exception(kgdb_tty_driver, kgdb_tty_line);
}
static struct kgdb_io kgdboc_io_ops = {
Index: b/drivers/tty/serial/serial_core.c
===================================================================
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2237,6 +2237,20 @@ static void uart_poll_put_char(struct tt
port = state->uart_port;
port->ops->poll_put_char(port, ch);
}
+
+static void uart_poll_post_exception(struct tty_driver *driver, int line)
+{
+ struct uart_driver *drv = driver->driver_state;
+ struct uart_state *state = drv->state + line;
+ struct uart_port *port;
+
+ if (!state || !state->uart_port)
+ return;
+
+ port = state->uart_port;
+ if (port->ops->poll_post_exception)
+ port->ops->poll_post_exception(port);
+}
#endif
static const struct tty_operations uart_ops = {
@@ -2269,6 +2283,7 @@ static const struct tty_operations uart_
.poll_init = uart_poll_init,
.poll_get_char = uart_poll_get_char,
.poll_put_char = uart_poll_put_char,
+ .poll_post_exception = uart_poll_post_exception,
#endif
};
Index: b/include/linux/tty_driver.h
===================================================================
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -283,6 +283,7 @@ struct tty_operations {
int (*poll_init)(struct tty_driver *driver, int line, char *options);
int (*poll_get_char)(struct tty_driver *driver, int line);
void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
+ void (*poll_post_exception)(struct tty_driver *driver, int line);
#endif
const struct file_operations *proc_fops;
};
Index: b/include/linux/serial_core.h
===================================================================
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -90,6 +90,7 @@ struct uart_ops {
int (*poll_init)(struct uart_port *);
void (*poll_put_char)(struct uart_port *, unsigned char);
int (*poll_get_char)(struct uart_port *);
+ void (*poll_post_exception)(struct uart_port *);
#endif
};
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