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Fix too early disabling of the serial (SCI(F)) ports

Message ID Pine.LNX.4.64.0912011045150.4701@axis700.grange (mailing list archive)
State Accepted
Headers show

Commit Message

Guennadi Liakhovetski Dec. 1, 2009, 9:54 a.m. UTC 
None
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Patch

diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 85119fb..70a52a5 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -833,8 +833,8 @@  static void sci_free_irq(struct sci_port *port)
 
 static unsigned int sci_tx_empty(struct uart_port *port)
 {
-	/* Can't detect */
-	return TIOCSER_TEMT;
+	unsigned short status = sci_in(port, SCxSR);
+	return status & SCxSR_TEND(port) ? TIOCSER_TEMT : 0;
 }
 
 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)