]> git.karo-electronics.de Git - karo-tx-linux.git/commit
tty: Retry failed reopen if tty teardown in-progress
authorPeter Hurley <peter@hurleysoftware.com>
Sun, 10 Jan 2016 05:13:45 +0000 (21:13 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 17 Feb 2016 20:31:02 +0000 (12:31 -0800)
commitb4312250147d42dceed6c8d44aa02cb29539db19
tree1f7fd5ec892b3ed87288565bb07ca893d9efbeb9
parentc35f1234931e2cae81726440ad4df8ef1f313219
tty: Retry failed reopen if tty teardown in-progress

commit 7f22f6c935cda600660e623a411fe380015d28d9 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>
drivers/tty/tty_io.c