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serial: 8250_dw: Take port lock while accessing LSR 

Accessing LSR requires port lock because it mutates lsr_saved_flags
in serial_lsr_in().

Fixes: 197eb5c416 ("serial: 8250_dw: Use serial_lsr_in() in dw8250_handle_irq()")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/c5879db7-bee9-93f-526e-872a292442@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-06-28 12:01:28 +03:00 committed by Greg Kroah-Hartman
parent 137b2d9859
commit b9491b2e45
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/8250/8250_dw.c
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@ -266,7 +266,10 @@ static int dw8250_handle_irq(struct uart_port *p)
/* Manually stop the Rx DMA transfer when acting as flow controller */
if (quirks & DW_UART_QUIRK_IS_DMA_FC && up->dma && up->dma->rx_running && rx_timeout) {
spin_lock_irqsave(&p->lock, flags);
status = serial_lsr_in(up);
spin_unlock_irqrestore(&p->lock, flags);
if (status & (UART_LSR_DR | UART_LSR_BI)) {
dw8250_writel_ext(p, RZN1_UART_RDMACR, 0);
dw8250_writel_ext(p, DW_UART_DMASA, 1);