[PATCH] serial: make sure UART is powered up when dumping MCTRL status

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Since serial devices are powered down when not in use and some of those
devices cannot be accessed when powered down, we need to enable power
around calls to get_mcrtl() when dumping port state via uart_line_info().
This resolves hangs observed on some machines while reading serial device
registers when a port is powered off.

Signed-off-by: George G. Davis <gdavis@mvista.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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George G. Davis 2007-02-14 00:33:06 -08:00 • committed by Linus Torvalds

parent 9b22271d4b

commit 3689a0ec60

1 changed files with 11 additions and 0 deletions

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drivers/serial/serial_core.c

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