linux-kernel - Re: [PATCH v3 14/16] block: sed-opal: pass steps via argument rather than via opal

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Message-ID: <20190127210922.GN21149@hacktheplanet>
Date:   Sun, 27 Jan 2019 16:09:23 -0500
From:   Scott Bauer <sbauer@...donthack.me>
To:     David Kozub <zub@...ux.fjfi.cvut.cz>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Subject: Re: [PATCH v3 14/16] block: sed-opal: pass steps via argument rather
 than via opal_dev

On Tue, Jan 22, 2019 at 11:31:45PM +0100, David Kozub wrote:
> The steps argument is only read by the next function, so it can
> be passed directly as an argument rather than via opal_dev.
> 
> Normally, the steps is an array on the stack, so the pointer stops
> being valid then the function that set opal_dev.steps returns.
> If opal_dev.steps was not set to NULL before return it would become
> a dangling pointer. When the steps are passed as argument this
> becomes easier to see and more difficult to misuse.
> 
> Signed-off-by: David Kozub <zub@...ux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@...donthack.me>