On (20/07/02 09:05), Tony Lindgren wrote:
> * Sergey Senozhatsky <sergey.senozhat...@gmail.com> [200702 05:13]:
> > On (20/06/30 11:02), Tony Lindgren wrote:
> > > This conditional disable for irq_shared does not look nice to me
> > > from the other device point of view :)
> > >
> > > Would it be possible to just set up te dummy interrupt handler
> > > for the startup, then change it back afterwards? See for example
> > > omap8250_no_handle_irq().
> >
> > I think we can do it. serial8250_do_startup() and irq handler take
> > port->lock, so they should be synchronized.
> >
> > Something like this then?
>
> Yeah thanks this should work better for shared irq.
This is, basically, an equivalent of
---
drivers/tty/serial/8250/8250_port.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_port.c
b/drivers/tty/serial/8250/8250_port.c
index d64ca77d9cfa..dba7747d2ddd 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2275,6 +2275,7 @@ int serial8250_do_startup(struct uart_port *port)
if (port->irq && !(up->port.flags & UPF_NO_THRE_TEST)) {
unsigned char iir1;
+
/*
* Test for UARTs that do not reassert THRE when the
* transmitter is idle and the interrupt has already
@@ -2284,8 +2285,6 @@ int serial8250_do_startup(struct uart_port *port)
* allow register changes to become visible.
*/
spin_lock_irqsave(&port->lock, flags);
- if (up->port.irqflags & IRQF_SHARED)
- disable_irq_nosync(port->irq);
wait_for_xmitr(up, UART_LSR_THRE);
serial_port_out_sync(port, UART_IER, UART_IER_THRI);
@@ -2297,8 +2296,6 @@ int serial8250_do_startup(struct uart_port *port)
iir = serial_port_in(port, UART_IIR);
serial_port_out(port, UART_IER, 0);
- if (port->irqflags & IRQF_SHARED)
- enable_irq(port->irq);
spin_unlock_irqrestore(&port->lock, flags);
/*
--
2.27.0
