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SubjectRe: [PATCH] misc: rtsx: Set setting_reg2 before use.
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On 5/16/22 8:56 AM, Nathan Chancellor wrote:
> On Mon, May 16, 2022 at 09:00:47AM -0400, Tom Rix wrote:
>> The clang build fails with
>> rts5261.c:406:13: error: variable 'setting_reg2' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
>> } else if (efuse_valid == 0) {
>> ^~~~~~~~~~~~~~~~
>>
>> setting_reg2 is set in this block
>> if (efuse_valid == 2 || efuse_valid == 3) {
>> ..
>> } else if (efuse_valid == 0) {
>> // default
>> ..
>> }
>> But efuse_valid can also have a value of 1.
>> Change the 'else if' to 'else' to make the second block the default.
>>
>> Fixes: b1c5f3085149 ("misc: rtsx: add rts5261 efuse function")
>> Signed-off-by: Tom Rix <trix@redhat.com>
> I am not sure if this fix is correct from a functional standpoint (i.e.
> is treating efuse_valid == 1 the same as efuse_valid == 0 correct?) but
> it is better than not handling this value altogether. For what it's
> worth:

I looked at how the code used to work, this seemed better than
initializing to NULL.

>
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
>
> As a side note, it is unfortunate that this change made it into -next
> when there was an outstanding report about this warning:

From the clang side, this is a build break and my static analysis infra
goes down.

These build breaks seem to happening every week, is there a precommit
clang gating test that could be done for -next ?

Tom

>
> https://lore.kernel.org/202205100220.WyAyhKap-lkp@intel.com/
>
>> ---
>> drivers/misc/cardreader/rts5261.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c
>> index 749cc5a46d13..f22634b14dc8 100644
>> --- a/drivers/misc/cardreader/rts5261.c
>> +++ b/drivers/misc/cardreader/rts5261.c
>> @@ -403,7 +403,7 @@ static void rts5261_init_from_hw(struct rtsx_pcr *pcr)
>> setting_reg1 = PCR_SETTING_REG4;
>> setting_reg2 = PCR_SETTING_REG5;
>> }
>> - } else if (efuse_valid == 0) {
>> + } else {
>> // default
>> setting_reg1 = PCR_SETTING_REG1;
>> setting_reg2 = PCR_SETTING_REG2;
>> --
>> 2.27.0
>>
> Cheers,
> Nathan
>

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