diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2012-03-30 17:14:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:44:13 -0800 |
| commit | 57a750294d5d53a6ec49ac69e837216b1d982d78 (patch) | |
| tree | 85fd37ef656c72a5e720befdb8bbff321f601b73 /drivers/staging/comedi/internal.h | |
| parent | f387ee89aca7a06b376c27326afd114fe93e01c2 (diff) | |
staging: comedi: don't hijack hardware device private data
commit c43435d7722134ed1fda58ce1025f41029bd58ad upstream.
comedi_auto_config() associates a Comedi minor device number with an
auto-configured hardware device and comedi_auto_unconfig() disassociates
it. Currently, these use the hardware device's private data pointer to
point to some allocated storage holding the minor device number. This
is a bit of a waste of the hardware device's private data pointer,
preventing it from being used for something more useful by the low-level
comedi device drivers. For example, it would make more sense if
comedi_usb_auto_config() was passed a pointer to the struct
usb_interface instead of the struct usb_device, but this cannot be done
currently because the low-level comedi drivers already use the private
data pointer in the struct usb_interface for something more useful.
This patch stops the comedi core hijacking the hardware device's private
data pointer. Instead, comedi_auto_config() stores a pointer to the
hardware device's struct device in the struct comedi_device_file_info
associated with the minor device number, and comedi_auto_unconfig()
calls new function comedi_find_board_minor() to recover the minor device
number associated with the hardware device.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/internal.h')
| -rw-r--r-- | drivers/staging/comedi/internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/staging/comedi/internal.h b/drivers/staging/comedi/internal.h index 434ce3433368..4208fb4cf0ff 100644 --- a/drivers/staging/comedi/internal.h +++ b/drivers/staging/comedi/internal.h @@ -7,6 +7,7 @@ int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data); int comedi_alloc_board_minor(struct device *hardware_device); void comedi_free_board_minor(unsigned minor); +int comedi_find_board_minor(struct device *hardware_device); void comedi_reset_async_buf(struct comedi_async *async); int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, unsigned long new_size); |