Peter Hurley 36697529b5 tty: Replace ldisc locking with ldisc_sem ...

Line discipline locking was performed with a combination of
a mutex, a status bit, a count, and a waitqueue -- basically,
a rw semaphore.

Replace the existing combination with an ld_semaphore.

Fixes:
 1) the 'reference acquire after ldisc locked' bug
 2) the over-complicated halt mechanism
 3) lock order wrt. tty_lock()
 4) dropping locks while changing ldisc
 5) previously unidentified deadlock while locking ldisc from
    both linked ttys concurrently
 6) previously unidentified recursive deadlocks

Adds much-needed lockdep diagnostics.

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

2013-07-23 16:38:34 -07:00

..

hvc

tty: replace strict_strtoul() with kstrtoul()

2013-06-03 10:30:42 -07:00

ipwireless

tty: ipwireless: Remove redundant NULL check before kfree

2013-03-15 13:58:32 -07:00

serial

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

2013-07-13 14:52:21 -07:00

vt

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-07-03 09:10:19 -07:00

amiserial.c

TTY: amiserial, use module_platform_driver_probe()

2013-03-15 13:55:23 -07:00

bfin_jtag_comm.c

…

cyclades.c

TTY: add tty_port_tty_hangup helper

2013-03-18 16:24:29 -07:00

ehv_bytechan.c

TTY: ehv_bytechan: add missing platform_driver_unregister() when module exit

2013-05-20 12:15:59 -07:00

goldfish.c

…

isicom.c

…

Kconfig

…

Makefile

tty: Add timed, writer-prioritized rw semaphore

2013-05-20 12:30:32 -07:00

metag_da.c

…

moxa.c

TTY: add tty_port_tty_hangup helper

2013-03-18 16:24:29 -07:00

moxa.h

…

mxser.c

tty: mxser: Fix build warning introduced by dfc7b837c7 (Re: linux-next: build warning after merge of the tty.current tree)

2013-05-22 10:26:02 -07:00

mxser.h

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n_gsm.c

TTY: fix DTR not being dropped on hang up

2013-03-18 16:27:53 -07:00

n_hdlc.c

…

n_r3964.c

…

n_tracerouter.c

…

n_tracesink.c

…

n_tracesink.h

…

n_tty.c

n_tty: Buffer work should not reschedule itself

2013-06-17 12:55:30 -07:00

nozomi.c

TTY: add tty_port_tty_hangup helper

2013-03-18 16:24:29 -07:00

pty.c

tty: Fix transient pty write() EIO

2013-06-17 12:37:29 -07:00

rocket_int.h

…

rocket.c

TTY: rocket, fix more no-PCI warnings

2013-05-20 12:15:59 -07:00

rocket.h

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synclink_gt.c

TTY: synclink_gt: fix DTR being raised on hang up

2013-04-12 14:08:17 -07:00

synclink.c

TTY: synclink: fix DTR being raised on hang up

2013-04-12 14:08:17 -07:00

synclinkmp.c

TTY: synclinkmp: fix DTR being raised on hang up

2013-04-12 14:08:18 -07:00

sysrq.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

2013-07-04 15:35:08 -07:00

tty_audit.c

audit: do not needlessly take a lock in tty_audit_exit

2013-04-30 15:31:28 -04:00

tty_buffer.c

tty: Replace ldisc locking with ldisc_sem

2013-07-23 16:38:34 -07:00

tty_io.c

tty: Replace ldisc locking with ldisc_sem

2013-07-23 16:38:34 -07:00

tty_ioctl.c

tty: Fix unsafe bit ops in tty_throttle_safe/unthrottle_safe

2013-04-15 11:08:12 -07:00

tty_ldisc.c

tty: Replace ldisc locking with ldisc_sem

2013-07-23 16:38:34 -07:00

tty_ldsem.c

tty: Add timed, writer-prioritized rw semaphore

2013-05-20 12:30:32 -07:00

tty_mutex.c

…

tty_port.c

tty: Complete ownership transfer of flip buffers

2013-03-18 16:44:02 -07:00