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comedi: s526: Add sanity checks for I/O base address

The "s526" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a Sensoray
526 board. It currently allows any base address to be configured but
the hardware only supports base addresses (configured by on-board DIP
switches) in the range 0 to 0xFFC0 on 64-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/20260130170416.49994-47-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman ae377d6a 63c19831

+2 -1
+2 -1
drivers/comedi/drivers/s526.c
··· 553 553 struct comedi_subdevice *s; 554 554 int ret; 555 555 556 - ret = comedi_request_region(dev, it->options[0], 0x40); 556 + ret = comedi_check_request_region(dev, it->options[0], 0x40, 557 + 0, 0xffc0, 64); 557 558 if (ret) 558 559 return ret; 559 560