linux-kernel - Re: [PATCH] scsi: gdth: Only call dma_free_coherent when buf is not NULL in ioc

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Date:   Mon, 25 Mar 2019 22:23:16 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Achim Leubner <achim_leubner@...ptec.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] scsi: gdth: Only call dma_free_coherent when buf is not NULL in ioc_general


Nathan,

> When building with -Wsometimes-uninitialized, Clang warns:
>
> drivers/scsi/gdth.c:3662:6: warning: variable 'paddr' is used
> uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
>
> Don't attempt to call dma_free_coherent when buf is NULL (meaning that
> we never called dma_alloc_coherent and initialized paddr), which avoids
> this warning.

Applied to 5.2/scsi-queue, thanks.

-- 
Martin K. Petersen	Oracle Linux Engineering