linux-kernel - Re: [PATCH] jffs2: Don't add summary entry when MTD write fails

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Date:	Thu, 25 Feb 2016 11:35:54 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Thomas Betker <thomas.betker@...enet.de>,
	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Thomas Betker <thomas.betker@...de-schwarz.com>
Subject: Re: [PATCH] jffs2: Don't add summary entry when MTD write fails

On Wed, 2015-11-11 at 21:27 +0100, Thomas Betker wrote:
> 
>  int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
>                               unsigned long count, loff_t to, size_t *retlen)
>  {
> +       int ret;
> +
> +       ret = mtd_writev(c->mtd, vecs, count, to, retlen);
> +
>         if (!jffs2_is_writebuffered(c)) {
>                 if (jffs2_sum_active()) {
>                         int res;
> +
> +                       if (ret ||
> +                           *retlen != iov_length((struct iovec *) vecs, count))
> +                               return ret;
> +
>                         res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
>                         if (res) {
>                                 return res;

OK... but perhaps we can dispense with the separate 'ret' and 'res'
variables and the rats nest of conditions, and do something like:

   int ret;

   ret = mtd_writev(…);

   if (!ret && *retlen == iov_length(…) &&
       !jffs2_is_writebuffered(c) && jffs2_sum_active()) 
          ret = jffs2_sum_add_kvec(…);
   
   return ret;

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation


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