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comedi: pcl816: Add sanity checks for I/O base address

The "pcl816" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a PCL-816
or PCL-814B ISA board. It currently allows any base address to be
configured but the hardware devices only support base addresses
(configured by on-board DIP switches) from 0 to 0x3F0 on 16-byte
boundaries.

Add a sanity check to ensure the device is not configured at an
unsupported base address.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20260130170416.49994-38-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman 55e39df1 c2454346

+2 -1
+2 -1
drivers/comedi/drivers/pcl816.c
··· 608 608 if (!devpriv) 609 609 return -ENOMEM; 610 610 611 - ret = comedi_request_region(dev, it->options[0], 0x10); 611 + ret = comedi_check_request_region(dev, it->options[0], 0x10, 612 + 0, 0x3ff, 16); 612 613 if (ret) 613 614 return ret; 614 615