static DEFINE_MUTEX(relay_channels_mutex);
static LIST_HEAD(relay_channels);
-/*
- * close() vm_op implementation for relay file mapping.
- */
-static void relay_file_mmap_close(struct vm_area_struct *vma)
-{
- struct rchan_buf *buf = vma->vm_private_data;
- buf->chan->cb->buf_unmapped(buf, vma->vm_file);
-}
-
/*
* fault() vm_op implementation for relay file mapping.
*/
*/
static const struct vm_operations_struct relay_file_mmap_ops = {
.fault = relay_buf_fault,
- .close = relay_file_mmap_close,
};
/*
static int relay_mmap_buf(struct rchan_buf *buf, struct vm_area_struct *vma)
{
unsigned long length = vma->vm_end - vma->vm_start;
- struct file *filp = vma->vm_file;
if (!buf)
return -EBADF;
vma->vm_ops = &relay_file_mmap_ops;
vma->vm_flags |= VM_DONTEXPAND;
vma->vm_private_data = buf;
- buf->chan->cb->buf_mapped(buf, filp);
return 0;
}
return 1;
}
-/*
- * buf_mapped() default callback. Does nothing.
- */
-static void buf_mapped_default_callback(struct rchan_buf *buf,
- struct file *filp)
-{
-}
-
-/*
- * buf_unmapped() default callback. Does nothing.
- */
-static void buf_unmapped_default_callback(struct rchan_buf *buf,
- struct file *filp)
-{
-}
-
/*
* create_buf_file_create() default callback. Does nothing.
*/
return -EINVAL;
}
-/* relay channel default callbacks */
-static struct rchan_callbacks default_channel_callbacks = {
- .subbuf_start = subbuf_start_default_callback,
- .buf_mapped = buf_mapped_default_callback,
- .buf_unmapped = buf_unmapped_default_callback,
- .create_buf_file = create_buf_file_default_callback,
- .remove_buf_file = remove_buf_file_default_callback,
-};
-
/**
* wakeup_readers - wake up readers waiting on a channel
* @work: contains the channel buffer
static void setup_callbacks(struct rchan *chan,
struct rchan_callbacks *cb)
{
- if (!cb) {
- chan->cb = &default_channel_callbacks;
- return;
- }
-
if (!cb->subbuf_start)
cb->subbuf_start = subbuf_start_default_callback;
- if (!cb->buf_mapped)
- cb->buf_mapped = buf_mapped_default_callback;
- if (!cb->buf_unmapped)
- cb->buf_unmapped = buf_unmapped_default_callback;
if (!cb->create_buf_file)
cb->create_buf_file = create_buf_file_default_callback;
if (!cb->remove_buf_file)
return NULL;
if (subbuf_size > UINT_MAX / n_subbufs)
return NULL;
+ if (!cb)
+ return NULL;
chan = kzalloc(sizeof(struct rchan), GFP_KERNEL);
if (!chan)