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Revert "tty: Fix race condition between __tty_buffer_request_room and flush_to_ldisc"

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This reverts commit 6a20dbd6ca.

Although the commit correctly identifies an unsafe race condition
between __tty_buffer_request_room() and flush_to_ldisc(), the commit
fixes the race with an unnecessary spinlock in a lockless algorithm.

The follow-on commit, "tty: Fix lockless tty buffer race" fixes
the race locklessly.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-05-02 10:56:11 -04:00 • committed by Greg Kroah-Hartman
parent 501fed45b7
commit 5fbf1a65dd
2 changed files with 2 additions and 15 deletions
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1
include/linux/tty.h
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@ -61,7 +61,6 @@ struct tty_bufhead {
struct tty_buffer *head; /* Queue head */
struct work_struct work;
struct mutex lock;
spinlock_t flush_lock;
atomic_t priority;
struct tty_buffer sentinel;
struct llist_head free; /* Free queue head */