ChangeSet 1.1451, 2004/06/14 16:19:17-07:00, Andrej.Filipcic@ijs.si

[PATCH] USB: pl2303 & input overruns

Backport the 2.6 fixes for handing overruns and other status reports
from the device.


 drivers/usb/serial/pl2303.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletion(-)


diff -Nru a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
--- a/drivers/usb/serial/pl2303.c	Tue Jun 15 10:12:15 2004
+++ b/drivers/usb/serial/pl2303.c	Tue Jun 15 10:12:15 2004
@@ -107,6 +107,7 @@
 #define VENDOR_READ_REQUEST		0x01
 
 #define UART_STATE			0x08
+#define UART_STATE_TRANSIENT_MASK	0x74
 #define UART_DCD			0x01
 #define UART_DSR			0x02
 #define UART_BREAK_ERROR		0x04
@@ -681,6 +682,7 @@
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
 	unsigned char *data = urb->transfer_buffer;
 	unsigned long flags;
+	u8 uart_state;
 
 	dbg("%s (%d)", __FUNCTION__, port->number);
 
@@ -711,8 +713,10 @@
 		return;
 
 	/* Save off the uart status for others to look at */
+	uart_state = data[UART_STATE];
 	spin_lock_irqsave(&priv->lock, flags);
-	priv->line_status = data[UART_STATE];
+	uart_state |= (priv->line_status & UART_STATE_TRANSIENT_MASK);
+	priv->line_status = uart_state;
 	spin_unlock_irqrestore(&priv->lock, flags);
 	wake_up_interruptible (&priv->delta_msr_wait);
 
@@ -770,7 +774,9 @@
 
 	spin_lock_irqsave(&priv->lock, flags);
 	status = priv->line_status;
+	priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 	spin_unlock_irqrestore(&priv->lock, flags);
+	wake_up_interruptible (&priv->delta_msr_wait); //AF from 2.6
 
 	/* break takes precedence over parity, */
 	/* which takes precedence over framing errors */