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Date:   Fri, 21 Oct 2022 08:09:27 +0300
From:   Kalle Valo <>
To:     Colin Ian King <>
Cc:     Jes Sorensen <>,
        "David S . Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Bitterblue Smith <>,,,,
Subject: Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

Colin Ian King <> writes:

> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
> potentially can contain any garbage value. Currently there is an if
> statement that sets one or the other of these variables, followed
> by an if statement that checks if any of these variables have been
> set to a non-zero value. In the case where they may contain
> uninitialized non-zero values, the latter if statement may be
> taken as true when it was not expected to.
> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
> Cleans up clang warning:
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
>                 if (hw_ctrl) {
>                     ^~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
> use occurs here
>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>                     ^~~~~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
> if its condition is always true
>                 if (hw_ctrl) {
>                 ^~~~~~~~~~~~~
> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
> Signed-off-by: Colin Ian King <>

I'll queue this to v6.1.


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