From bf9c1fca9ae9a79ed209e7ab2c10b3862f3f6f72 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Thu, 29 Jul 2010 11:46:32 +0200 Subject: [PATCH] Char: nozomi, set tty->driver_data appropriately 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: [] mutex_lock+0x10/0x40 ... Pid: 2157, comm: modem-manager Not tainted 2.6.34.1-0.1-desktop #1 2768DR7/2768DR7 RIP: 0010:[] [] 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: [] 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 Cc: Alan Cox Cc: stable [.34, .35] Signed-off-by: Greg Kroah-Hartman --- drivers/char/nozomi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c index 21ae1b158b3b..18af923093c3 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); } -- GitLab