linux-kernel - Re: [PATCH] scsi: message: fusion: remove unused timeleft variable

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Message-ID: <0afb4c99-63d9-0d53-8dfc-1a07cc562764@redhat.com>
Date:   Fri, 31 Mar 2023 14:03:50 -0700
From:   Tom Rix <trix@...hat.com>
To:     Bill Wendling <morbo@...gle.com>
Cc:     sathya.prakash@...adcom.com, sreekanth.reddy@...adcom.com,
        suganath-prabu.subramani@...adcom.com, nathan@...nel.org,
        ndesaulniers@...gle.com, MPT-FusionLinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] scsi: message: fusion: remove unused timeleft variable


On 3/31/23 12:40 PM, Bill Wendling wrote:
> On Fri, Mar 31, 2023 at 9:26 AM Tom Rix <trix@...hat.com> wrote:
>> clang with W=1 reports
>> drivers/message/fusion/mptsas.c:4796:17: error: variable
>>    'timeleft' set but not used [-Werror,-Wunused-but-set-variable]
>>          unsigned long    timeleft;
>>                           ^
>> This variable is not used so remove it.
>>
>> Signed-off-by: Tom Rix <trix@...hat.com>
>> ---
>>   drivers/message/fusion/mptsas.c | 3 ---
>>   1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
>> index 86f16f3ea478..d458665e2fc9 100644
>> --- a/drivers/message/fusion/mptsas.c
>> +++ b/drivers/message/fusion/mptsas.c
>> @@ -4793,7 +4793,6 @@ mptsas_issue_tm(MPT_ADAPTER *ioc, u8 type, u8 channel, u8 id, u64 lun,
>>          MPT_FRAME_HDR   *mf;
>>          SCSITaskMgmt_t  *pScsiTm;
>>          int              retval;
>> -       unsigned long    timeleft;
>>
>>          *issue_reset = 0;
>>          mf = mpt_get_msg_frame(mptsasDeviceResetCtx, ioc);
>> @@ -4829,8 +4828,6 @@ mptsas_issue_tm(MPT_ADAPTER *ioc, u8 type, u8 channel, u8 id, u64 lun,
>>          mpt_put_msg_frame_hi_pri(mptsasDeviceResetCtx, ioc, mf);
>>
>>          /* Now wait for the command to complete */
>> -       timeleft = wait_for_completion_timeout(&ioc->taskmgmt_cmds.done,
>> -           timeout*HZ);
> It looks bad to remove the call to wait_for_completion_timeout(). Is
> it truly not needed? If it's needed, the "timeleft" should be checked
> or a comment left to explain why it's not checked.

Yeah. this is a screw up on my part, sorry.

T

>
> -bw
>
>>          if (!(ioc->taskmgmt_cmds.status & MPT_MGMT_STATUS_COMMAND_GOOD)) {
>>                  retval = -1; /* return failure */
>>                  dtmprintk(ioc, printk(MYIOC_s_ERR_FMT
>> --
>> 2.27.0
>>
>>