tty: isicom: fix deadlock on shutdown

Alexander Strakh <strakh@ispras.ru> reported

	KERNEL_VERSION: 2.6.31
	DESCRIBE:
Driver drivers/char/isicom.c might sleep in atomic  context, because it
calls
tty_port_xmit_buf under spin_lock.

./drivers/char/isicom.c:
1307 static void isicom_hangup(struct tty_struct *tty)
1308 {
...
1315         spin_lock_irqsave(&port->card->card_lock, flags);
1316         isicom_shutdown_port(port);
...

Path to might_sleep macro from isicom_hangup:
1. isicom_hangup calls spin_lock_irqsave (drivers/char/isicom.c:1315) and
then
calls isicom_shutdown_port.
2. isiscom_shutdown_port calls tty_port_free_xmit_buf at
drivers/char/isicom.c:906
3. tty_port_free_xmit_buf calls mutex_lock at drivers/char/tty_port:48

Found by Linux Driver Verification Project.

Reported-by: Alexander Strakh <strakh@ispras.ru>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 1e91c302ee423cf814aa55d8acde12f050a71d67..300d5bd6cd0602fc57f160d00757d64fb49e2e6a 100644 (file)
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -887,7 +887,6 @@ static void isicom_shutdown_port(struct isi_port *port)
 {
        struct isi_board *card = port->card;
 
-       tty_port_free_xmit_buf(&port->port);
        if (--card->count < 0) {
                pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n",
                        card->base, card->count);
@@ -927,6 +926,7 @@ static void isicom_shutdown(struct tty_port *port)
        outw(card->port_status, card->base + 0x02);
        isicom_shutdown_port(ip);
        spin_unlock_irqrestore(&card->card_lock, flags);
+       tty_port_free_xmit_buf(port);
 }
 
 static void isicom_close(struct tty_struct *tty, struct file *filp)