The driver currently checks the size of `struct jr3_sensor` is correct
when a device is attached, returning an error if it is wrong. Replace
that with a compile-time check. We don't care too much about the size
of `struct jr3_sensor` as it is embedded in the larger `struct
jr3_block` and is followed by a lot of padding. We should care more
that the size of `struct jr3_block` is correct, as it describes the
overall register layout of a block, and there is an array of such blocks
(one per subdevice). Check its size at compile-time using the
`BUILD_BUG_ON()` macro.
Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
---
drivers/staging/comedi/drivers/jr3_pci.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/drivers/jr3_pci.c
b/drivers/staging/comedi/drivers/jr3_pci.c
index 8399493e7472..c0ae92217932 100644
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -688,12 +688,7 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
int ret;
int i;
- if (sizeof(struct jr3_sensor) != 0xc00) {
- dev_err(dev->class_dev,
- "sizeof(struct jr3_sensor) = %x [expected %x]\n",
- (unsigned int)sizeof(struct jr3_sensor), 0xc00);
- return -EINVAL;
- }
+ BUILD_BUG_ON(sizeof(struct jr3_block) != 0x80000);
if (context < ARRAY_SIZE(jr3_pci_boards))
board = &jr3_pci_boards[context];
--
2.11.0
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