diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2010-07-29 11:46:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-13 13:30:45 -0700 |
| commit | 69348a6d2e12b2212ce7516f607d05a94ca9abd4 (patch) | |
| tree | c3bef5535deaf53493b8ae82d7ad78770cb46efc | |
| parent | 8642acfa5eb90d591f72ef762ac7e188b6e30e96 (diff) | |
Char: nozomi, set tty->driver_data appropriately
commit bf9c1fca9ae9a79ed209e7ab2c10b3862f3f6f72 upstream.
Sorry, one more fix, this one depends on the other, so this is rather 2/2.
--
tty->driver_data is used all over the code, but never set. This
results in oopses like:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000130
IP: [<ffffffff814a0040>] mutex_lock+0x10/0x40
...
Pid: 2157, comm: modem-manager Not tainted 2.6.34.1-0.1-desktop #1 2768DR7/2768DR7
RIP: 0010:[<ffffffff814a0040>] [<ffffffff814a0040>] mutex_lock+0x10/0x40
RSP: 0018:ffff88007b16fa50 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000130 RCX: 0000000000000003
RDX: 0000000000000003 RSI: 0000000000000286 RDI: 0000000000000130
RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000130
R13: 0000000000000001 R14: 0000000000000000 R15: ffff88007b16feb4
...
Call Trace:
[<ffffffffa077690d>] ntty_write_room+0x4d/0x90 [nozomi]
...
Set tty->driver_data to the computed port in .install to not recompute it in
every place where needed. Switch .open to use driver_data too.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/char/nozomi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c index 21ae1b158b3..18af923093c 100644 --- a/drivers/char/nozomi.c +++ b/drivers/char/nozomi.c @@ -1612,6 +1612,7 @@ static int ntty_install(struct tty_driver *driver, struct tty_struct *tty) if (ret == 0) { tty_driver_kref_get(driver); tty->count++; + tty->driver_data = port; driver->ttys[tty->index] = tty; } return ret; @@ -1640,7 +1641,7 @@ static int ntty_activate(struct tty_port *tport, struct tty_struct *tty) static int ntty_open(struct tty_struct *tty, struct file *filp) { - struct port *port = get_port_by_tty(tty); + struct port *port = tty->driver_data; return tty_port_open(&port->port, tty, filp); } |