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authorNicolas Ferre <nicolas.ferre@microchip.com>2017-03-20 16:38:57 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-31 17:26:20 +0200
commit497e1e16f45c70574dc9922c7f75c642c2162119 (patch)
tree14ca17b3b9cf8f85cb328ffda06acd299c05b1d5 /drivers/tty
parent31ca2c63fdc0aee725cbd4f207c1256f5deaabde (diff)
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tty/serial: atmel: fix TX path in atmel_console_write()
A side effect of 89d8232411a8 ("tty/serial: atmel_serial: BUG: stop DMA from transmitting in stop_tx") is that the console can be called with TX path disabled. Then the system would hang trying to push charecters out in atmel_console_putchar(). Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> Fixes: 89d8232411a8 ("tty/serial: atmel_serial: BUG: stop DMA from transmitting in stop_tx") Cc: stable <stable@vger.kernel.org> #4.4+ Acked-by: Richard Genoud <richard.genoud@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/atmel_serial.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 5f644515ed33..1f50a83ef958 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2488,6 +2488,9 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
pdc_tx = atmel_uart_readl(port, ATMEL_PDC_PTSR) & ATMEL_PDC_TXTEN;
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS);
+ /* Make sure that tx path is actually able to send characters */
+ atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN);
+
uart_console_write(port, s, count, atmel_console_putchar);
/*