# Re: \[PATCH\] iwlwifi: pcie: fix constant-conversion warning

- From: Kalle Valo \<hidden\>
- Date: 2021-10-31 07:06:54 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/10/1558758
- Thread: https://ratatoskr.run/linux-wireless/2021/10/1558758/t.md

```text
Arnd Bergmann [ref] writes:

> From: Arnd Bergmann <arnd@arndb.de>
>
> clang points out a potential issue with integer overflow when
> the iwl_dev_info_table[] array is empty:
>
> drivers/net/wireless/intel/iwlwifi/pcie/drv.c:1344:42: error: implicit conversion from 'unsigned long' to 'int' changes value from 18446744073709551615 to -1 [-Werror,-Wconstant-conversion]
>         for (i = ARRAY_SIZE(iwl_dev_info_table) - 1; i >= 0; i--) {
>                ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
>
> This is still harmless, as the loop correctly terminates, but adding
> an (int) cast makes that clearer to the compiler.
>
> Fixes: 3f7320428fa4 ("iwlwifi: pcie: simplify iwl_pci_find_dev_info()")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Luca, can I take this to wireless-drivers? Ack?

-- 
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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
```