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List: linux-serial
Subject: [PATCH 12/12] serial: bcm63xx_uart: fix irq storm after rx fifo overrun.
From: Greg Kroah-Hartman <gregkh () suse ! de>
Date: 2011-06-28 16:03:49
Message-ID: 1309277029-1532-12-git-send-email-gregkh () suse ! de
[Download RAW message or body]
From: Maxime Bizon <mbizon@freebox.fr>
RX fifo reset is required to clear irq.
Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/tty/serial/bcm63xx_uart.c | 18 ++++++++++++++----
1 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index a1a0e55..c0b68b9 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -250,6 +250,20 @@ static void bcm_uart_do_rx(struct uart_port *port)
/* get overrun/fifo empty information from ier
* register */
iestat = bcm_uart_readl(port, UART_IR_REG);
+
+ if (unlikely(iestat & UART_IR_STAT(UART_IR_RXOVER))) {
+ unsigned int val;
+
+ /* fifo reset is required to clear
+ * interrupt */
+ val = bcm_uart_readl(port, UART_CTL_REG);
+ val |= UART_CTL_RSTRXFIFO_MASK;
+ bcm_uart_writel(port, val, UART_CTL_REG);
+
+ port->icount.overrun++;
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+ }
+
if (!(iestat & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
break;
@@ -284,10 +298,6 @@ static void bcm_uart_do_rx(struct uart_port *port)
if (uart_handle_sysrq_char(port, c))
continue;
- if (unlikely(iestat & UART_IR_STAT(UART_IR_RXOVER))) {
- port->icount.overrun++;
- tty_insert_flip_char(tty, 0, TTY_OVERRUN);
- }
if ((cstat & port->ignore_status_mask) == 0)
tty_insert_flip_char(tty, c, flag);
--
1.7.5.4
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