urd->reclen = cdev->id.driver_info;
ccw_device_get_id(cdev, &urd->dev_id);
mutex_init(&urd->io_mutex);
- mutex_init(&urd->open_mutex);
+ init_waitqueue_head(&urd->wait);
+ spin_lock_init(&urd->open_lock);
atomic_set(&urd->ref_count, 1);
urd->cdev = cdev;
get_device(&cdev->dev);
struct urdev *urd;
TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
- intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count);
+ intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
+ irb->scsw.cmd.count);
if (!intparm) {
TRACE("ur_int_handler: unsolicited interrupt\n");
/* On special conditions irb is an error pointer */
if (IS_ERR(irb))
urd->io_request_rc = PTR_ERR(irb);
- else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
+ else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
urd->io_request_rc = 0;
else
urd->io_request_rc = -EIO;
if (!urd)
return -ENXIO;
- if (file->f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&urd->open_mutex)) {
+ spin_lock(&urd->open_lock);
+ while (urd->open_flag) {
+ spin_unlock(&urd->open_lock);
+ if (file->f_flags & O_NONBLOCK) {
rc = -EBUSY;
goto fail_put;
}
- } else {
- if (mutex_lock_interruptible(&urd->open_mutex)) {
+ if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) {
rc = -ERESTARTSYS;
goto fail_put;
}
+ spin_lock(&urd->open_lock);
}
+ urd->open_flag++;
+ spin_unlock(&urd->open_lock);
TRACE("ur_open\n");
fail_urfile_free:
urfile_free(urf);
fail_unlock:
- mutex_unlock(&urd->open_mutex);
+ spin_lock(&urd->open_lock);
+ urd->open_flag--;
+ spin_unlock(&urd->open_lock);
fail_put:
urdev_put(urd);
return rc;
struct urfile *urf = file->private_data;
TRACE("ur_release\n");
- mutex_unlock(&urf->urd->open_mutex);
+ spin_lock(&urf->urd->open_lock);
+ urf->urd->open_flag--;
+ spin_unlock(&urf->urd->open_lock);
+ wake_up_interruptible(&urf->urd->wait);
urdev_put(urf->urd);
urfile_free(urf);
return 0;