linux-kernel - Re: [PATCH v5] lightnvn: pblk

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Message-ID: <1491923975.2654.4.camel@sandisk.com>
Date:   Tue, 11 Apr 2017 15:19:36 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "mb@...htnvm.io" <mb@...htnvm.io>,
        "jg@...htnvm.io" <jg@...htnvm.io>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "javier@...xlabs.com" <javier@...xlabs.com>
Subject: Re: [PATCH v5] lightnvn: pblk

On Tue, 2017-04-11 at 16:31 +0200, Javier González wrote:
> Changes since v4:
> * Rebase on top of Matias' for-4.12/core
> * Fix type implicit conversions reported by sparse (reported by Bart Van
>   Assche)
> * Make error and debug statistics long atomic variables.

Hello Javier,

Thanks for the quick respin. But have you already had a look at the
diagnostics reported by smatch? Smatch reports e.g.

drivers/lightnvm/pblk-rb.c:783: pblk_rb_tear_down_check() error: we previously assumed 'rb->entries' could be null (see line 779)

on the following code:

	if (rb->entries)
		goto out;

	for (i = 0; i < rb->nr_entries; i++) {
		entry = &rb->entries[i];

		if (entry->data)
			goto out;
	}

Is that "if (rb->entries)" check correct or should that perhaps been
"if (!rb->entries)"? Smatch is available at http://repo.or.cz/w/smatch.git.

Bart.