2016-12-02 10:50:26 +00:00
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From a98fb5280c69d90e85bb875177a68880089312b0 Mon Sep 17 00:00:00 2001
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2016-04-07 19:25:10 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Wed, 9 Mar 2016 13:28:24 +0000
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] serial: Take care starting a hung-up tty's port
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2016-04-07 19:25:10 +00:00
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tty_port_hangup sets a port's tty field to NULL (holding the port lock),
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but uart_tx_stopped, called from __uart_start (with the port lock),
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uses the tty field without checking for NULL.
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Change uart_tx_stopped to treat a NULL tty field as another stopped
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indication.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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include/linux/serial_core.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/include/linux/serial_core.h
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+++ b/include/linux/serial_core.h
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@@ -397,7 +397,7 @@ int uart_resume_port(struct uart_driver
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static inline int uart_tx_stopped(struct uart_port *port)
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{
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struct tty_struct *tty = port->state->port.tty;
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- if (tty->stopped || port->hw_stopped)
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+ if (!tty || tty->stopped || port->hw_stopped)
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return 1;
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return 0;
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}
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