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UPSTREAM: mac80211: Fix clang warning about constant operand in logical operation

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When clang detects a non-boolean constant in a logical operation it
generates a 'constant-logical-operand' warning. In
ieee80211_try_rate_control_ops_get() the result of strlen(<const str>)
is used in a logical operation, clang resolves the expression to an
(integer) constant at compile time when clang's builtin strlen function
is used.

Change the condition to check for strlen() > 0 to make the constant
operand boolean and thus avoid the warning.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 93f56de259)
Bug: 78886293
Change-Id: Ia819eb188699c1d81047c0dfa143da52c6cb490c
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Matthias Kaehlcke 2017-04-06 16:31:41 -07:00 committed by Amit Pundir
parent d1a54f67f7
commit 44371ae3d0
1 changed files with 4 additions and 2 deletions
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6
net/mac80211/rate.c
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@ -173,9 +173,11 @@ ieee80211_rate_control_ops_get(const char *name)
/* try default if specific alg requested but not found */
ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
/* try built-in one if specific alg requested but not found */
if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
/* Note: check for > 0 is intentional to avoid clang warning */
if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0))
/* try built-in one if specific alg requested but not found */
ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
kernel_param_unlock(THIS_MODULE);
return ops;