2019-09-19 14:43:19 +00:00
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From 3f8c7542e12f23f6be2cd7206fbf808409db2848 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 6 Nov 2018 12:57:48 +0000
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] sc16is7xx: Don't spin if no data received
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2019-07-09 18:32:28 +00:00
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See: https://github.com/raspberrypi/linux/issues/2676
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/tty/serial/sc16is7xx.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/tty/serial/sc16is7xx.c
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+++ b/drivers/tty/serial/sc16is7xx.c
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2019-11-06 16:19:11 +00:00
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@@ -696,6 +696,8 @@ static bool sc16is7xx_port_irq(struct sc
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2019-07-09 18:32:28 +00:00
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rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG);
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if (rxlen)
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sc16is7xx_handle_rx(port, rxlen, iir);
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+ else
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+ return false;
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break;
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case SC16IS7XX_IIR_THRI_SRC:
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sc16is7xx_handle_tx(port);
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