diff options
Diffstat (limited to 'tty-open-hangup-race-fixup.patch')
| -rw-r--r-- | tty-open-hangup-race-fixup.patch | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/tty-open-hangup-race-fixup.patch b/tty-open-hangup-race-fixup.patch deleted file mode 100644 index cda7f41b3..000000000 --- a/tty-open-hangup-race-fixup.patch +++ /dev/null @@ -1,76 +0,0 @@ -From 9e88e8b9915b5e067507a087437d80e6a133d612 Mon Sep 17 00:00:00 2001 -From: Jiri Slaby <jslaby@suse.cz> -Date: Sat, 27 Nov 2010 16:06:46 +0100 -Subject: [PATCH 1/1] TTY: open/hangup race fixup - - -Signed-off-by: Jiri Slaby <jslaby@suse.cz> ---- - drivers/tty/tty_io.c | 10 +++++++++- - include/linux/tty.h | 1 + - 2 files changed, 10 insertions(+), 1 deletions(-) - -diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c -index 878f6d6..35480dd 100644 ---- a/drivers/tty/tty_io.c -+++ b/drivers/tty/tty_io.c -@@ -559,6 +559,9 @@ void __tty_hangup(struct tty_struct *tty) - - tty_lock(); - -+ /* some functions below drop BTM, so we need this bit */ -+ set_bit(TTY_HUPPING, &tty->flags); -+ - /* inuse_filps is protected by the single tty lock, - this really needs to change if we want to flush the - workqueue with the lock held */ -@@ -578,6 +581,10 @@ void __tty_hangup(struct tty_struct *tty) - } - spin_unlock(&tty_files_lock); - -+ /* -+ * it drops BTM and thus races with reopen -+ * we protect the race by TTY_HUPPING -+ */ - tty_ldisc_hangup(tty); - - read_lock(&tasklist_lock); -@@ -615,7 +622,6 @@ void __tty_hangup(struct tty_struct *tty) - tty->session = NULL; - tty->pgrp = NULL; - tty->ctrl_status = 0; -- set_bit(TTY_HUPPED, &tty->flags); - spin_unlock_irqrestore(&tty->ctrl_lock, flags); - - /* Account for the p->signal references we killed */ -@@ -641,6 +647,7 @@ void __tty_hangup(struct tty_struct *tty) - * can't yet guarantee all that. - */ - set_bit(TTY_HUPPED, &tty->flags); -+ clear_bit(TTY_HUPPING, &tty->flags); - tty_ldisc_enable(tty); - - tty_unlock(); -@@ -1311,6 +1318,7 @@ static int tty_reopen(struct tty_struct *tty) - struct tty_driver *driver = tty->driver; - - if (test_bit(TTY_CLOSING, &tty->flags) || -+ test_bit(TTY_HUPPING, &tty->flags) || - test_bit(TTY_LDISC_CHANGING, &tty->flags)) - return -EIO; - -diff --git a/include/linux/tty.h b/include/linux/tty.h -index 032d79f..54e4eaa 100644 ---- a/include/linux/tty.h -+++ b/include/linux/tty.h -@@ -366,6 +366,7 @@ struct tty_file_private { - #define TTY_HUPPED 18 /* Post driver->hangup() */ - #define TTY_FLUSHING 19 /* Flushing to ldisc in progress */ - #define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */ -+#define TTY_HUPPING 21 /* ->hangup() in progress */ - - #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty)) - --- -1.7.3.1 - |