linux-kernel - Re: [PATCH] scsi: FlashPoint: Remove unnecessary parentheses

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Date:   Fri, 21 Sep 2018 09:19:40 -0600
From:   Khalid Aziz <khalid@...ehiking.org>
To:     Nathan Chancellor <natechancellor@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: FlashPoint: Remove unnecessary parentheses

On 09/20/2018 03:10 PM, Nathan Chancellor wrote:
> Clang warns when multiple pairs of parentheses are used for a single
> conditional statement.
> 
> In file included from drivers/scsi/BusLogic.c:57:
> drivers/scsi/FlashPoint.c:2947:34: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
>                                 if ((currSCCB->Sccb_scsistat == SELECT_SN_ST)) {
>                                      ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
> drivers/scsi/FlashPoint.c:2947:34: note: remove extraneous parentheses around the comparison to silence this warning
>                                 if ((currSCCB->Sccb_scsistat == SELECT_SN_ST)) {
>                                     ~                        ^              ~
> drivers/scsi/FlashPoint.c:2947:34: note: use '=' to turn this equality comparison into an assignment
>                                 if ((currSCCB->Sccb_scsistat == SELECT_SN_ST)) {
>                                                              ^~
>                                                              =
> drivers/scsi/FlashPoint.c:2956:39: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
>                                 else if ((currSCCB->Sccb_scsistat ==
>                                           ~~~~~~~~~~~~~~~~~~~~~~~~^~
> drivers/scsi/FlashPoint.c:2956:39: note: remove extraneous parentheses around the comparison to silence this warning
>                                 else if ((currSCCB->Sccb_scsistat ==
>                                          ~                        ^
> drivers/scsi/FlashPoint.c:2956:39: note: use '=' to turn this equality comparison into an assignment
>                                 else if ((currSCCB->Sccb_scsistat ==
>                                                                   ^~
>                                                                   =
> 2 warnings generated.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/156
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/scsi/FlashPoint.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

There are more places in this file with extraneous parentheses, for example:

 952         if ((RD_HARPOON(ioport + hp_vendor_id_1) != ORION_VEND_1))
 953                 return (int)FAILURE;
 954
 955         if ((RD_HARPOON(ioport + hp_device_id_0) != ORION_DEV_0))
 956                 return (int)FAILURE;
 957
 958         if ((RD_HARPOON(ioport + hp_device_id_1) != ORION_DEV_1))

Wonder why the compiler does not complain about these, but this patch is
good for now. I will clean up the rest in another patch.

James, Martin, please pull this patch into the scsi tree.

Acked-by: Khalid Aziz <khalid@...ehiking.org>