[SCSI] Bug 4940 Repeatable Kernel Panic on Adaptec 2015S I20 device on bootup

From: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>

Prevent driver from loading if another driver (i2o) has already claimed
the resources associated with the card. Discussion associated with this
bug can be referenced at http://bugzilla.kernel.org/show_bug.cgi?id=4940


where it was agreed to use pci_request_regions in both the dpt_i2o and
the i2o driver to prevent both drivers loading on the same adapter(s).

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>

Rejections fixed up and

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>