linux-kernel - Re: [PATCH v3] scsi: ibmvscsi: Don't use rc uninitialized in ibmvscsi_do

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Message-Id: <912e3069-8fcc-b9e2-3b11-5d00236d34ee@linux.vnet.ibm.com>
Date:   Mon, 3 Jun 2019 16:58:16 -0700
From:   Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3] scsi: ibmvscsi: Don't use rc uninitialized in
 ibmvscsi_do_work

On 06/03/2019 04:44 PM, Nathan Chancellor wrote:
> clang warns:
> 
> drivers/scsi/ibmvscsi/ibmvscsi.c:2126:7: warning: variable 'rc' is used
> uninitialized whenever switch case is taken [-Wsometimes-uninitialized]
>         case IBMVSCSI_HOST_ACTION_NONE:
>              ^~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/ibmvscsi/ibmvscsi.c:2151:6: note: uninitialized use occurs
> here
>         if (rc) {
>             ^~
> 
> Initialize rc in the IBMVSCSI_HOST_ACTION_UNBLOCK case statement then
> shuffle IBMVSCSI_HOST_ACTION_NONE down to the default case statement and
> make it return early so that rc is never used uninitialized in this
> function.
> 
> Fixes: 035a3c4046b5 ("scsi: ibmvscsi: redo driver work thread to use enum action states")
> Link: https://github.com/ClangBuiltLinux/linux/issues/502
> Suggested-by: Michael Ellerman <mpe@...erman.id.au>
> Suggested-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Tyrel Datwyler <tyreld@...ux.ibm.com>