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Date:   Tue, 3 Mar 2020 12:29:56 +0200
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: Re: [PATCH v2 2/3] nvmem: check for NULL reg_read and reg_write
 before dereferencing
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On Mon, Mar 02, 2020 at 03:43:02PM +0000, Nicholas Johnson wrote:
> Return -EPERM if reg_read is NULL in bin_attr_nvmem_read() or if
> reg_write is NULL in bin_attr_nvmem_write().

Hmm, is this patch required at all since you already check the invalid
combinations in the patch 1/3?