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comedi: dt2801: Add sanity checks for I/O base address

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The "dt2801" driver uses an admin-supplied configuration option
(`it->options[0]`) to configure the I/O port base address of a supported
board in the DT2801 family.  It currently allows any base address to be
configured but the hardware only supports base addresses (configured by
an on-board DIP switch) in the range 0x200 to 0x3fe on 2-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/20260130170416.49994-20-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott
2026-01-30 16:47:44 +00:00
committed by Greg Kroah-Hartman
parent 40f86ce1d1
commit 4ede1d2e69
1 changed files with 2 additions and 1 deletions
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3
drivers/comedi/drivers/dt2801.c
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@@ -540,7 +540,8 @@ static int dt2801_attach(struct comedi_device *dev, struct comedi_devconfig *it)
int ret = 0;
int n_ai_chans;
ret = comedi_request_region(dev, it->options[0], 0x2);
ret = comedi_check_request_region(dev, it->options[0], 0x2,
0x200, 0x3ff, 2);
if (ret)
return ret;