linux-kernel - [PATCH 2/4] serial: bfin_5xx: need to disable DMA TX interrupt too

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Date:	Tue, 19 Jan 2010 06:13:11 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	linux-serial@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Graf Yang <graf.yang@...log.com>
Subject: [PATCH 2/4] serial: bfin_5xx: need to disable DMA TX interrupt too

From: Graf Yang <graf.yang@...log.com>

If we don't disable the DMA TX channel, an inopportune timeout will
trigger the interrupt handler and may cause a dead lock with the spin_lock.

Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/serial/bfin_5xx.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 15843cc..b5a9b37 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -488,6 +488,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 {
 	int x_pos, pos;
 
+	dma_disable_irq(uart->tx_dma_channel);
 	dma_disable_irq(uart->rx_dma_channel);
 	spin_lock_bh(&uart->port.lock);
 
@@ -521,6 +522,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 	}
 
 	spin_unlock_bh(&uart->port.lock);
+	dma_enable_irq(uart->tx_dma_channel);
 	dma_enable_irq(uart->rx_dma_channel);
 
 	mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
-- 
1.6.6

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