tty: Invert tty_lock/ldisc_sem lock order

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Dropping the tty lock to acquire the tty->ldisc_sem allows several
race conditions (such as hangup while changing the ldisc) which requires
extra states and testing. The ldisc_sem->tty_lock lock order has
not been required since tty buffer ownership was moved to tty_port.

Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Peter Hurley 2014-11-05 12:12:45 -05:00 • committed by Greg Kroah-Hartman

parent 3ee175d9d9

commit c8483bc9de

1 changed files with 3 additions and 4 deletions

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drivers/tty/tty_ldisc.c

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