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-rw-r--r--drivers/tty/serial/stm32-usart.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 8f032e77b954..848e063db2ae 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -209,19 +209,22 @@ static unsigned long stm32_usart_get_char(struct uart_port *port, u32 *sr,
return c;
}
-static void stm32_usart_receive_chars(struct uart_port *port, bool threaded)
+static void stm32_usart_receive_chars(struct uart_port *port, bool irqflag)
{
struct tty_port *tport = &port->state->port;
struct stm32_port *stm32_port = to_stm32_port(port);
const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
- unsigned long c;
+ unsigned long c, flags;
u32 sr;
char flag;
- spin_lock(&port->lock);
+ if (irqflag)
+ spin_lock_irqsave(&port->lock, flags);
+ else
+ spin_lock(&port->lock);
while (stm32_usart_pending_rx(port, &sr, &stm32_port->last_res,
- threaded)) {
+ irqflag)) {
sr |= USART_SR_DUMMY_RX;
flag = TTY_NORMAL;
@@ -275,7 +278,10 @@ static void stm32_usart_receive_chars(struct uart_port *port, bool threaded)
uart_insert_char(port, sr, USART_SR_ORE, c, flag);
}
- uart_unlock_and_check_sysrq(port);
+ if (irqflag)
+ uart_unlock_and_check_sysrq_irqrestore(port, irqflag);
+ else
+ uart_unlock_and_check_sysrq(port);
tty_flip_buffer_push(tport);
}
@@ -496,10 +502,9 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
static irqreturn_t stm32_usart_threaded_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
- struct stm32_port *stm32_port = to_stm32_port(port);
- if (stm32_port->rx_ch)
- stm32_usart_receive_chars(port, true);
+ /* Receiver timeout irq for DMA RX */
+ stm32_usart_receive_chars(port, false);
return IRQ_HANDLED;
}