target/linux/brcm2708/patches-4.1/0083-bcm2708-vcio-Remove-restriction-of-only-a-single-ins.patch

   1 From 9fa64d590a4f206f604b4b78bf61fc17c94e1d5d Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Fri, 26 Jun 2015 17:37:38 +0100
   4 Subject: [PATCH 083/148] bcm2708-vcio: Remove restriction of only a single
   5  instance being open
   6
   7 We need more than one process to be able to use mailbox interface (e.g. HW cursor in fbturbo and hello_fft).
   8 Locking should be handled on each mailbox access
   9 ---
  10  drivers/mailbox/bcm2708-vcio.c | 14 --------------
  11  1 file changed, 14 deletions(-)
  12
  13 --- a/drivers/mailbox/bcm2708-vcio.c
  14 +++ b/drivers/mailbox/bcm2708-vcio.c
  15 @@ -242,20 +242,9 @@ EXPORT_SYMBOL_GPL(bcm_mailbox_property);
  16
  17  /* Platform Device for Mailbox */
  18
  19 -/*
  20 - * Is the device open right now? Used to prevent
  21 - * concurent access into the same device
  22 - */
  23 -static bool device_is_open;
  24 -
  25  /* This is called whenever a process attempts to open the device file */
  26  static int device_open(struct inode *inode, struct file *file)
  27  {
  28 -       /* We don't want to talk to two processes at the same time */
  29 -       if (device_is_open)
  30 -               return -EBUSY;
  31 -
  32 -       device_is_open = true;
  33         try_module_get(THIS_MODULE);
  34
  35         return 0;
  36 @@ -263,9 +252,6 @@ static int device_open(struct inode *ino
  37
  38  static int device_release(struct inode *inode, struct file *file)
  39  {
  40 -       /* We're now ready for our next caller */
  41 -       device_is_open = false;
  42 -
  43         module_put(THIS_MODULE);
  44
  45         return 0;