tty: Retry failed reopen if tty teardown in-progress

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commit 7f22f6c935 upstream.

A small window exists where a tty reopen will observe the tty
just prior to imminent teardown (tty->count == 0); in this case, open()
returns EIO to userspace.

Instead, retry the open after checking for signals and yielding;
this interruptible retry loop allows teardown to commence and initialize
a new tty on retry. Never retry the BSD master pty reopen; there is no
guarantee the pty pair teardown is imminent since the slave file
descriptors may remain open indefinitely.

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

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Peter Hurley 2016-01-09 21:13:45 -08:00 • committed by Greg Kroah-Hartman

parent c35f123493

commit b431225014

1 changed files with 8 additions and 4 deletions

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drivers/tty/tty_io.c

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