serial: 8250: Defer interrupt enable until fifos enabled

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An already-active sender can swamp the interrupt handler with
"too much work" if the rx interrupts are enabled when the fifo is
disabled and operating in single-byte mode.

Defer rx and line status interrupt enable until after the fifos
are enabled in set_termios(), but at least initialize the shadow
IER value with the interrupts which will be enabled.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Peter Hurley 2015-07-12 21:11:31 -04:00 • committed by Greg Kroah-Hartman

parent 45c6df4471

commit ee3ad90be5

1 changed files with 3 additions and 4 deletions

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7

drivers/tty/serial/8250/8250_port.c

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