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comedi: pcm3724: Add sanity checks for I/O base address

The "pcm3724" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a PCM-3724
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 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/20260130170416.49994-40-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Ian Abbott and committed by
Greg Kroah-Hartman ddd5b287 aaddeab2

+2 -1
+2 -1
drivers/comedi/drivers/pcm3724.c
··· 194 194 if (!priv) 195 195 return -ENOMEM; 196 196 197 - ret = comedi_request_region(dev, it->options[0], 0x10); 197 + ret = comedi_check_request_region(dev, it->options[0], 0x10, 198 + 0, 0x3ff, 16); 198 199 if (ret) 199 200 return ret; 200 201