diff options
author | Maciej W. Rozycki <macro@linux-mips.org> | 2008-07-24 00:29:49 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 13:47:29 -0400 |
commit | e9a8f4d1de12633bfb71b5fee47745b32877b7b5 (patch) | |
tree | 3bf0f747b32314491b9b6cf4f44a2c6d3288390e /kernel/ptrace.c | |
parent | 377135912806ddc87d56d64fafa685f4063c45f1 (diff) |
serial: DZ11: avoid a hang at console switch-over
Changes to the generic console support code that happened a while ago
introduced a scenario where the initial console is used in parallel with
the final console during a brief period when switching between the two is
in progress. During that time a message about the switch-over is printed.
With some combinations of chips, firmware and drivers, such as the DEC
DZ11 clone used with the DECstation, a hang may happen because the
firmware used for the initial console may not expect the state of the chip
after it has been initialised by the driver.
This is a workaround for the DZ11 which reuses the power-management
callback to keep the transmitter of the line associated with the console
enabled. It reflects the consensus reached in a discussion a while ago.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Jiri Slaby <jirislaby@gmail.com>
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>
Diffstat (limited to 'kernel/ptrace.c')
0 files changed, 0 insertions, 0 deletions