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

The "pcmmio" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a PCM-MIO
board. It currently allows any base address to be configured but the
hardware only supports base addresses (configured by on-board jumpers)
in the range 0 to 0xFFE0 on 32-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/20260130170416.49994-43-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman 78ba300a c375d40d

+2 -1
+2 -1
drivers/comedi/drivers/pcmmio.c
··· 667 667 struct comedi_subdevice *s; 668 668 int ret; 669 669 670 - ret = comedi_request_region(dev, it->options[0], 32); 670 + ret = comedi_check_request_region(dev, it->options[0], 32, 671 + 0, 0xffff, 32); 671 672 if (ret) 672 673 return ret; 673 674