Commit 68204a69 authored by Justin Stitt's avatar Justin Stitt Committed by Kalle Valo

wifi: mt7601u: fix clang -Wformat warning

When building with Clang we encounter this warning:
| drivers/net/wireless/mediatek/mt7601u/debugfs.c:92:6: error: format
| specifies type 'unsigned char' but the argument has type 'int'
| [-Werror,-Wformat] dev->ee->reg.start + dev->ee->reg.num - 1);

The format specifier used is `%hhu` which describes a u8. Both
`dev->ee->reg.start` and `.num` are u8 as well. However, the expression
as a whole is promoted to an int as you cannot get smaller-than-int from
addition. Therefore, to fix the warning, use the promoted-to-type's
format specifier -- in this case `%d`.

example:
```
uint8_t a = 4, b = 7;
int size = sizeof(a + b - 1);
printf("%d\n", size);
// output: 4
```

See more:
(https://wiki.sei.cmu.edu/confluence/display/c/INT02-C.+Understand+integer+conversion+rules)
"Integer types smaller than int are promoted when an operation is
performed on them. If all values of the original type can be represented
as an int, the value of the smaller type is converted to an int;
otherwise, it is converted to an unsigned int."
Signed-off-by: default avatarJustin Stitt <justinstitt@google.com>
Acked-by: default avatarJakub Kicinski <kubakici@wp.pl>
Signed-off-by: default avatarKalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220711212932.1501592-1-justinstitt@google.com
parent 07db88f1
......@@ -88,7 +88,7 @@ mt7601u_eeprom_param_show(struct seq_file *file, void *data)
dev->ee->rssi_offset[0], dev->ee->rssi_offset[1]);
seq_printf(file, "Reference temp: %hhx\n", dev->ee->ref_temp);
seq_printf(file, "LNA gain: %hhx\n", dev->ee->lna_gain);
seq_printf(file, "Reg channels: %hhu-%hhu\n", dev->ee->reg.start,
seq_printf(file, "Reg channels: %hhu-%d\n", dev->ee->reg.start,
dev->ee->reg.start + dev->ee->reg.num - 1);
seq_puts(file, "Per rate power:\n");
......
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