From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61BA31A83E8; Mon, 14 Apr 2025 08:08:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744618106; cv=none; b=gr8oSoN46h3Yi1xmnTsY/3Anaz4+DaVrLpyVllR8yj33QcbGl0LnXaKuuJnTE2+QsHghpzqdPQV86duIh8wZmaY+gQgqoDM0lINF6Cy/sQ8EKBNK2S//VG6jIA+8ZClsCvYc8xIqQ4uyFRNdCnCwN+cBHz4OXU13snOe9yyURSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744618106; c=relaxed/simple; bh=zcQCVSxooZwhHaQf5rrvyURe5NZaFkh+Z0g0qopq9vk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=oTJI2yROmk0MLl7bktxtxH43J2JshGxhf9TIbQqmwNPQT0gNwkMNk9bvlQDgCi7+I5M43/pgjfNPdaDCrfySOkb4XDCL+sVRH29ZYehzC6bx1xdiq4S+bY3TL3qtSSlrU0QNksPVqbFJLlNDEOlziuM3Vd///B+JBIDStOcintA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AjxJjMxs; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AjxJjMxs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2694C4CEE2; Mon, 14 Apr 2025 08:08:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744618105; bh=zcQCVSxooZwhHaQf5rrvyURe5NZaFkh+Z0g0qopq9vk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=AjxJjMxsTT/sgL+hDo2CM0PyxNawA9npVRy8hLRy6LayOrBg1Cu7MUX12YI20y5k4 G5MRY4Y5hfbHMti2LuUHeAefeILtXT0ogUuD+Z64qW2copotaasPZR14sGEzTdPmZm CcYZSFyLtHjIC2jUenPsCiSg1JecLuA3l7ZN6NYJsv1GalI/yuP1vVHxwCwqAY880R gdsu3U3YJkGRC5RhlhotNUMMqIR7CcyF89FR7fYGv8/rSokwFjD6LJoKbGCbP8kI4d cVah/R8b77yATvXqaUsG3R5MLcAtsLXmCMq4DYg597/exmtFZCPK75TBwQiCyIlNQH xeTKdopf0Q3SA== Message-ID: Date: Mon, 14 Apr 2025 10:08:18 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug To: Johan Hovold Cc: Chenyuan Yang , vkoul@kernel.org, kishon@kernel.org, lumag@kernel.org, quic_kriskura@quicinc.com, manivannan.sadhasivam@linaro.org, konrad.dybcio@oss.qualcomm.com, quic_varada@quicinc.com, quic_kbajaj@quicinc.com, johan+linaro@kernel.org, linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250413212518.2625540-1-chenyuan0y@gmail.com> <22ec4fc8-9368-4955-ac97-c49b3317d3b3@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 14/04/2025 09:40, Johan Hovold wrote: > On Mon, Apr 14, 2025 at 09:30:19AM +0200, Krzysztof Kozlowski wrote: >> On 13/04/2025 23:25, Chenyuan Yang wrote: >>> In qmp_usb_iomap(), one branch returns the result of devm_ioremap(), which >>> can be NULL. Since IS_ERR() does not catch a NULL pointer, >> >> No, that's not true. NAK. > > I'm afraid you're mistaken here. See __devm_ioremap() which can return > NULL. > Uh, you are right, I only checked devm_of_iomap in qmp_usb_iomap(). Anyway, the fix should be different - given function should either return ERR or NULL, not both, so devm_ioremap return value needs to be wrapped in ERR_PTR. Best regards, Krzysztof