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author | 2009-06-11 12:50:12 +0100 | |
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committer | 2009-06-11 08:51:01 -0700 | |
commit | c65c9bc3efa5589f691276bb9db689119a711222 (patch) | |
tree | ccb86ffb28ecafa77623fb2789faae8e4c1e2c4b /drivers/bluetooth | |
parent | tty: Extract various bits of ldisc code (diff) | |
download | linux-c65c9bc3efa5589f691276bb9db689119a711222.tar.gz linux-c65c9bc3efa5589f691276bb9db689119a711222.tar.bz2 linux-c65c9bc3efa5589f691276bb9db689119a711222.zip |
tty: rewrite the ldisc locking
There are several pretty much unfixable races in the old ldisc code, especially
with respect to pty behaviour and also to hangup. It's easier to rewrite the
code than simply try and patch it up.
This patch
- splits the ldisc from the tty (so we will be able to refcount it more cleanly
later)
- introduces a mutex lock for ldisc changing on an active device
- fixes the complete mess that hangup caused
- implements hopefully correct setldisc/close/hangup locking
There are still some problems around pty pairs that have always been there but
at least it is now possible to understand the code and fix further problems.
This fixes the following known bugs
- hang up can leak ldisc references
- hang up may not call open/close on ldisc in a matched way
- pty/tty pairs can deadlock during an ldisc change
- reading the ldisc proc files can cause every ldisc to be loaded
and probably a few other of the mysterious ldisc race reports.
I'm sure it also adds the odd new one.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/bluetooth')
-rw-r--r-- | drivers/bluetooth/hci_ldisc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index af761dc434f6..688015128594 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -277,8 +277,8 @@ static int hci_uart_tty_open(struct tty_struct *tty) /* FIXME: why is this needed. Note don't use ldisc_ref here as the open path is before the ldisc is referencable */ - if (tty->ldisc.ops->flush_buffer) - tty->ldisc.ops->flush_buffer(tty); + if (tty->ldisc->ops->flush_buffer) + tty->ldisc->ops->flush_buffer(tty); tty_driver_flush_buffer(tty); return 0; |