diff options
Diffstat (limited to 'drivers/isdn/gigaset/interface.c')
| -rw-r--r-- | drivers/isdn/gigaset/interface.c | 36 |
1 files changed, 29 insertions, 7 deletions
diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c index c9f28dd40d5c..f45d68620161 100644 --- a/drivers/isdn/gigaset/interface.c +++ b/drivers/isdn/gigaset/interface.c @@ -339,7 +339,8 @@ static int if_tiocmset(struct tty_struct *tty, struct file *file, static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) { struct cardstate *cs; - int retval = -ENODEV; + struct cmdbuf_t *cb; + int retval; cs = (struct cardstate *) tty->driver_data; if (!cs) { @@ -355,18 +356,39 @@ static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) if (!cs->connected) { gig_dbg(DEBUG_IF, "not connected"); retval = -ENODEV; - } else if (!cs->open_count) + goto done; + } + if (!cs->open_count) { dev_warn(cs->dev, "%s: device not opened\n", __func__); - else if (cs->mstate != MS_LOCKED) { + retval = -ENODEV; + goto done; + } + if (cs->mstate != MS_LOCKED) { dev_warn(cs->dev, "can't write to unlocked device\n"); retval = -EBUSY; - } else { - retval = cs->ops->write_cmd(cs, buf, count, - &cs->if_wake_tasklet); + goto done; + } + if (count <= 0) { + /* nothing to do */ + retval = 0; + goto done; } - mutex_unlock(&cs->mutex); + cb = kmalloc(sizeof(struct cmdbuf_t) + count, GFP_KERNEL); + if (!cb) { + dev_err(cs->dev, "%s: out of memory\n", __func__); + retval = -ENOMEM; + goto done; + } + memcpy(cb->buf, buf, count); + cb->len = count; + cb->offset = 0; + cb->next = NULL; + cb->wake_tasklet = &cs->if_wake_tasklet; + retval = cs->ops->write_cmd(cs, cb); +done: + mutex_unlock(&cs->mutex); return retval; } |