diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2013-11-08 15:03:29 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-11 16:16:44 -0800 |
| commit | ef77c0b2570623f1d72527cb1c6c3f3d3c59793e (patch) | |
| tree | bb6222077014fb9a924e2fdc4a6ac15a9d3205d5 /drivers/staging/comedi/drivers.c | |
| parent | d19db51a0eeb659cd924a9d08b20a2ed4ee46b15 (diff) | |
staging: comedi: add detachment counter for validity checks
Add a member `detach_count` to `struct comedi_device` that is
incremented every time the device gets detached. This will be used in
some validity checks in the 'read' and 'write' file operations to make
sure the attachment remains valid.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers.c')
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index 4f727731a72d..15b1ab885e77 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -136,6 +136,7 @@ void comedi_device_detach(struct comedi_device *dev) comedi_device_cancel_all(dev); down_write(&dev->attach_lock); dev->attached = false; + dev->detach_count++; if (dev->driver) dev->driver->detach(dev); comedi_device_detach_cleanup(dev); |