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serial: 8250: Use @ier bits to determine if Rx is stopped

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Commit f19c3f6c81 ("serial: 8250_port: Don't service RX FIFO if
throttled") uses @read_status_mask (bit UART_LSR_DR) to determine
if Rx has been stopped. However, the bit UART_LSR_DR is not
managed properly in @read_status_mask for all Rx stop/start
situations and is therefore not suitable for this purpose.

Use the UART_IER_RLSI and UART_IER_RDI bits in @ier instead, as
this is already common in 8250-variants and drivers.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20241216171244.12783-2-john.ogness@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Ogness 2024-12-16 18:18:41 +01:06 committed by Greg Kroah-Hartman
parent e95cb63e57
commit c9f49e3e45
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/8250/8250_port.c
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@ -1931,7 +1931,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
*/
if (!(status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS)) &&
(port->status & (UPSTAT_AUTOCTS | UPSTAT_AUTORTS)) &&
!(port->read_status_mask & UART_LSR_DR))
!(up->ier & (UART_IER_RLSI | UART_IER_RDI)))
skip_rx = true;
if (status & (UART_LSR_DR | UART_LSR_BI) && !skip_rx) {