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serial: sc16is7xx: Don't spin if no data received

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There are multiple causes of interrupts, errors being one, and only the
receipt of data warrants continued polling.

See: https://github.com/raspberrypi/linux/issues/2676

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2024-02-02 15:41:29 +00:00
committed by Dom Cobley
parent e150dc4629
commit 80412b25ae
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/sc16is7xx.c
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@@ -821,6 +821,8 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
if (rxlen)
sc16is7xx_handle_rx(port, rxlen, iir);
else
rc = false;
break;
/* CTSRTS interrupt comes only when CTS goes inactive */
case SC16IS7XX_IIR_CTSRTS_SRC: