staging: quatech_usb2: Potential lost wakeup scenario in TIOCMIWAIT

commit e8df1674d383d2ecc6efa8d7dba74c03aafdfdd7 upstream.

If the usermode app does an ioctl over this serial device  by
using TIOCMIWAIT, then the code will wait by setting the current
task state to TASK_INTERRUPTIBLE and then calling schedule().
This will be woken up by the qt2_process_modem_status on URB
completion when the port_extra->shadowMSR is set to the new
modem status.

However, this could result in a lost wakeup scenario due to a race
in the logic in the qt2_ioctl(TIOCMIWAIT) loop and the URB completion
for new modem status in qt2_process_modem_status.
Due to this, the usermode app's task will continue to sleep despite a
change in the modem status.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/quatech_usb2/quatech_usb2.c b/drivers/staging/quatech_usb2/quatech_usb2.c
index f7726f1d3641895e238d4364e0c6f15cc46aa2d3..ab6e3c73e523f3b4716a3fc55471736d66988cd0 100644 (file)
--- a/drivers/staging/quatech_usb2/quatech_usb2.c
+++ b/drivers/staging/quatech_usb2/quatech_usb2.c
@@ -921,9 +921,10 @@ static int qt2_ioctl(struct tty_struct *tty, struct file *file,
                dbg("%s() port %d, cmd == TIOCMIWAIT enter",
                        __func__, port->number);
                prev_msr_value = port_extra->shadowMSR  & QT2_SERIAL_MSR_MASK;
+               barrier();
+               __set_current_state(TASK_INTERRUPTIBLE);
                while (1) {
                        add_wait_queue(&port_extra->wait, &wait);
-                       set_current_state(TASK_INTERRUPTIBLE);
                        schedule();
                        dbg("%s(): port %d, cmd == TIOCMIWAIT here\n",
                                __func__, port->number);
@@ -931,9 +932,12 @@ static int qt2_ioctl(struct tty_struct *tty, struct file *file,
                        /* see if a signal woke us up */
                        if (signal_pending(current))
                                return -ERESTARTSYS;
+                       set_current_state(TASK_INTERRUPTIBLE);
                        msr_value = port_extra->shadowMSR & QT2_SERIAL_MSR_MASK;
-                       if (msr_value == prev_msr_value)
+                       if (msr_value == prev_msr_value) {
+                               __set_current_state(TASK_RUNNING);
                                return -EIO;  /* no change - error */
+                       }
                        if ((arg & TIOCM_RNG &&
                                ((prev_msr_value & QT2_SERIAL_MSR_RI) ==
                                        (msr_value & QT2_SERIAL_MSR_RI))) ||
@@ -946,6 +950,7 @@ static int qt2_ioctl(struct tty_struct *tty, struct file *file,
                                (arg & TIOCM_CTS &&
                                ((prev_msr_value & QT2_SERIAL_MSR_CTS) ==
                                        (msr_value & QT2_SERIAL_MSR_CTS)))) {
+                               __set_current_state(TASK_RUNNING);
                                return 0;
                        }
                } /* end inifinite while */