linux-kernel - Re: [PATCH] mtd: Add simple read disturb test

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Date:	Thu, 2 Apr 2015 11:32:08 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	Brian Norris <computersforpeace@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: Add simple read disturb test

On Thu, Apr 2, 2015 at 11:13 AM, Richard Weinberger <richard@....at> wrote:

> +       err = -ENOMEM;
> +       iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
> +       if (!iobuf)
> +               goto out;

The error handling here does not look right.

> +
> +       iobuf_orig = kmalloc(mtd->erasesize, GFP_KERNEL);
> +       if (!iobuf_orig)
> +               goto out;
> +
> +       prandom_bytes_state(&rnd_state, iobuf_orig, mtd->erasesize);
> +
> +       bit_flips = kcalloc(ebcnt, sizeof(unsigned long), GFP_KERNEL);
> +       if (!bit_flips)
> +               goto out;
> +
> +       bbt = kzalloc(ebcnt, GFP_KERNEL);
> +       if (!bbt)
> +               goto out;
> +
> +       err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
> +       if (err)
> +               goto out;
> +
> +       pr_info("erasing and programming flash\n");
> +       for (i = 0; i < ebcnt; ++i) {
> +               if (skip_blocks && i % skip_blocks != 0)
> +                       continue;
> +
> +               if (bbt[i])
> +                       continue;
> +
> +               ret = mtdtest_erase_eraseblock(mtd, i);
> +               if (ret) {
> +                       err = ret;
> +                       goto out;
> +               }
> +
> +               ret = mtdtest_write(mtd, i * mtd->erasesize, mtd->erasesize,
> +                                   iobuf_orig);
> +               if (ret) {
> +                       err = ret;
> +                       goto out;
> +               }
> +
> +               ret = mtdtest_relax();
> +               if (ret)
> +                       goto out;
> +       }
> +
> +       pr_info("starting read disturb test on every %ith block\n",
> +               skip_blocks);
> +       while (!ret) {
> +               for (i = 0; i < ebcnt; ++i) {
> +                       if (skip_blocks && i % skip_blocks != 0)
> +                               continue;
> +
> +                       if (bbt[i])
> +                               continue;
> +
> +                       ret = read_eraseblock_by_page(i, iteration);
> +
> +                       ret = mtdtest_relax();
> +                       if (ret)
> +                               goto out;
> +               }
> +
> +               iteration++;
> +               if (iteration % 1000 == 0)
> +                       pr_info("iteration %lu started\n", iteration);
> +       }
> +
> +       if (err)
> +               pr_info("finished with errors\n");
> +       else
> +               pr_info("finished\n");
> +
> +out:
> +
> +       kfree(bit_flips);
> +       kfree(iobuf);
> +       kfree(iobuf_orig);
> +       kfree(bbt);

,as you have a single label to handle all the free's.
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