tree fd4e91763cbf0063028bcc1ec2d2ea5f94437419
parent 06cdff8a593bc52d53ce5c4c5cfc961a7fc32ad3
author Ian Abbott <abbotti@mev.co.uk> 1377257837 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1377279107 -0700

staging: comedi: bug-fix NULL pointer dereference on failed attach

Commit dcd7b8bd63cb81c5b973bf86510ca3c80bbbd162 ("staging: comedi: put
module _after_ detach" by myself) reversed a couple of calls in
`comedi_device_attach()` when recovering from an error returned by the
low-level driver's 'attach' handler.  Unfortunately, that introduced a
NULL pointer dereference bug as `dev->driver` is NULL after the call to
`comedi_device_detach()`.   We still have a pointer to the low-level
comedi driver structure in the `driv` variable, so use that instead.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>