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serial: 8250: dw: Introduce an rx_timeout variable in the IRQ path

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In a next change we are going to need the same Rx timeout condition as
we already have in the IRQ handling code. Let's just create a boolean to
clarify what this operation does before reusing it.

There is no functional change.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220422180615.9098-7-miquel.raynal@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miquel Raynal
2022-04-22 20:06:12 +02:00
committed by Greg Kroah-Hartman
parent e4fb03fe10
commit 8ef6e1ba71
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/8250/8250_dw.c
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@@ -225,6 +225,7 @@ static int dw8250_handle_irq(struct uart_port *p)
struct uart_8250_port *up = up_to_u8250p(p);
struct dw8250_data *d = to_dw8250_data(p->private_data);
unsigned int iir = p->serial_in(p, UART_IIR);
bool rx_timeout = (iir & 0x3f) == UART_IIR_RX_TIMEOUT;
unsigned int status;
unsigned long flags;
@@ -238,7 +239,7 @@ static int dw8250_handle_irq(struct uart_port *p)
* This problem has only been observed so far when not in DMA mode
* so we limit the workaround only to non-DMA mode.
*/
if (!up->dma && ((iir & 0x3f) == UART_IIR_RX_TIMEOUT)) {
if (!up->dma && rx_timeout) {
spin_lock_irqsave(&p->lock, flags);
status = p->serial_in(p, UART_LSR);