usb: cdc-acm: Kill ACM_READY() macro completely

The ACM_READY() macro doesn't seem to do anything useful, and it may
prevent tty_wait_until_sent() from working properly when called from
close.

Previously, acm_tty_chars_in_buffer() returned 0 whenever
acm->port.count was 0. This means close() could return before all the
data has actually been written.

Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 9 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 3027ada1b81..d9d9340abe6 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -60,8 +60,6 @@ static struct acm *acm_table[ACM_TTY_MINORS];
 
 static DEFINE_MUTEX(acm_table_lock);
 
-#define ACM_READY(acm)  (acm && acm->dev && acm->port.count)
-
 /*
  * acm_table accessors
  */
@@ -319,9 +317,6 @@ static void acm_ctrl_irq(struct urb *urb)
                 goto exit;
         }
 
-        if (!ACM_READY(acm))
-                goto exit;
-
         usb_mark_last_busy(acm->dev);
 
         data = (unsigned char *)(dr + 1);
@@ -481,8 +476,7 @@ static void acm_write_bulk(struct urb *urb)
         spin_lock_irqsave(&acm->write_lock, flags);
         acm_write_done(acm, wb);
         spin_unlock_irqrestore(&acm->write_lock, flags);
-        if (ACM_READY(acm))
-                schedule_work(&acm->work);
+        schedule_work(&acm->work);
 }
 
 static void acm_softint(struct work_struct *work)
@@ -492,8 +486,6 @@ static void acm_softint(struct work_struct *work)
 
         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 
-        if (!ACM_READY(acm))
-                return;
         tty = tty_port_tty_get(&acm->port);
         if (!tty)
                 return;