wifi: iwlwifi: mvm: fix clang -Wformat warnings

When building with Clang we encounter these warnings:
| drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c:1108:47: error:
| format specifies type 'unsigned char' but the argument has type 's16'
| (aka 'short') [-Werror,-Wformat] IWL_DEBUG_INFO(mvm, "\tburst index:
| %hhu\n", res->ftm.burst_index);
-
| drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c:1111:47: error:
| format specifies type 'unsigned char' but the argument has type 's32'
| (aka 'int') [-Werror,-Wformat] IWL_DEBUG_INFO(mvm, "\trssi spread:
| %hhu\n", res->ftm.rssi_spread);

The previous format specifier `%hhu` describes a u8 but our arguments
are wider than this which means bits are potentially being lost.

Variadic functions (printf-like) undergo default argument promotion.
Documentation/core-api/printk-formats.rst specifically recommends using
the promoted-to-type's format flag.

As per C11 6.3.1.1:
(https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1548.pdf) `If an int
can represent all values of the original type ..., the value is
converted to an int; otherwise, it is converted to an unsigned int.
These are called the integer promotions.` Thus it makes sense to change
`%hhu` to `%d` for both instances of the warning.

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220711222919.2043613-1-justinstitt@google.com

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c b/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c
index 777c568..8c5b97f 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c
@@ -1105,10 +1105,10 @@ static void iwl_mvm_debug_range_resp(struct iwl_mvm *mvm, u8 index,
        IWL_DEBUG_INFO(mvm, "\tstatus: %d\n", res->status);
        IWL_DEBUG_INFO(mvm, "\tBSSID: %pM\n", res->addr);
        IWL_DEBUG_INFO(mvm, "\thost time: %llu\n", res->host_time);
-       IWL_DEBUG_INFO(mvm, "\tburst index: %hhu\n", res->ftm.burst_index);
+       IWL_DEBUG_INFO(mvm, "\tburst index: %d\n", res->ftm.burst_index);
        IWL_DEBUG_INFO(mvm, "\tsuccess num: %u\n", res->ftm.num_ftmr_successes);
        IWL_DEBUG_INFO(mvm, "\trssi: %d\n", res->ftm.rssi_avg);
-       IWL_DEBUG_INFO(mvm, "\trssi spread: %hhu\n", res->ftm.rssi_spread);
+       IWL_DEBUG_INFO(mvm, "\trssi spread: %d\n", res->ftm.rssi_spread);
        IWL_DEBUG_INFO(mvm, "\trtt: %lld\n", res->ftm.rtt_avg);
        IWL_DEBUG_INFO(mvm, "\trtt var: %llu\n", res->ftm.rtt_variance);
        IWL_DEBUG_INFO(mvm, "\trtt spread: %llu\n", res->ftm.rtt_spread);