diff options
| author | Antti Kaijanmäki <antti.kaijanmaki@nomovok.com> | 2009-11-23 10:54:47 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-23 10:54:47 -0800 |
| commit | dcfcb256cc23c4436691b0fe677275306699d6a1 (patch) | |
| tree | 15df747529bf1da7c646e877675b202797508a21 /drivers | |
| parent | 9ce673d5e919966efc1ef5adf20248e6ecc62724 (diff) | |
hso: fix soft-lockup
Fix soft-lockup in hso.c which is triggered on SMP machine when
modem is removed while file descriptor(s) under /dev are still open:
old version called kref_put() too early which resulted in destroying
hso_serial and hso_device objects which were still used later on.
Signed-off-by: Antti Kaijanmäki <antti.kaijanmaki@nomovok.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/hso.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index 746839bb89f..43bc3fcc0d8 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -1363,7 +1363,7 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp) /* reset the rts and dtr */ /* do the actual close */ serial->open_count--; - kref_put(&serial->parent->ref, hso_serial_ref_free); + if (serial->open_count <= 0) { serial->open_count = 0; spin_lock_irq(&serial->serial_lock); @@ -1383,6 +1383,8 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp) usb_autopm_put_interface(serial->parent->interface); mutex_unlock(&serial->parent->mutex); + + kref_put(&serial->parent->ref, hso_serial_ref_free); } /* close the requested serial port */ |