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 0F9793BB48; Tue, 3 Mar 2026 05:25:32 +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=1772515533; cv=none; b=n3gIpFwGESiikXr6KFmN+Ja5TtptAVZ5CfTqKJWAmxyL8R+h90fIzifLxL0Ue/WOKXmRunLpbCHOe/DpQRGfdTeBx5bBv7po+Xh0G2PRXarqUbppsdxGR8t8P9BEEWjXro9UKWPyxb20880UY/yy9dLWb+0mV0A5l+9kRC66RMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772515533; c=relaxed/simple; bh=7GF00BGy8PQFlcuD9ahVgiimSkSs5q4/LzUguCD3UU0=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=htaG4aaXKK3exhVYAM9DPifFavVjt2EpTElKC4cbfSwdKTfHi+vfVq9zKPe1/hFQ98FsPXWC3vU9e7AxMFdrFhr5Tla3QpKUmBg7rGruQLFzp4ckk0Gl0pfFc4f+ugpTNtKedHYGbZ8VmU+SzL+t6JX9L4Erim9oujZk68EWwd4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Q7HrFzZN; 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="Q7HrFzZN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF3FEC116C6; Tue, 3 Mar 2026 05:25:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772515532; bh=7GF00BGy8PQFlcuD9ahVgiimSkSs5q4/LzUguCD3UU0=; h=Date:Subject:To:References:From:In-Reply-To:From; b=Q7HrFzZNWvODMRdtB/NmCCtzSnGN57ifb+Pg4fa6yHJLYYuSX+Dxd9iej5o3pqL4E gQAeaCOhrFXBocaau/kGfJM778IoMnk0O7tfJV7tYuexD2Xof4biyKzCMgEOSFd2NI JiyXKdotCXWw9uXINEhsdHIseoBNyn6L+dslcwLrgfkWPmSMZuY75izi9HaUCTZKg/ JmyLoMFEt6SLrFxcQbYYBnxlEexD9SCRKDiOXgi0LI4/cPTtL0EMj61j9DvTPPB1lF uwh1i+klO2Qg892zfmj/4df0Y1rMhZItjzoTMJkJ6rrNi2ydyql4vL9/nnaEOtuYAi Dfta8v+FbiJAA== Message-ID: Date: Tue, 3 Mar 2026 06:25:29 +0100 Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/1] serial: 8250_port: Drop duplicate NULL check To: Andy Shevchenko , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org References: <20260302152738.2498579-1-andriy.shevchenko@linux.intel.com> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02. 03. 26, 16:27, Andy Shevchenko wrote: > serial8250_release_dma() is NULL-aware, no need to check this in the caller. > While at it, make sure DMA won't be used again, by NULLifying the pointer. > > Signed-off-by: Andy Shevchenko > --- > drivers/tty/serial/8250/8250_port.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c > index d99c5ad7e47c..2a830969d22b 100644 > --- a/drivers/tty/serial/8250/8250_port.c > +++ b/drivers/tty/serial/8250/8250_port.c > @@ -2366,8 +2366,8 @@ void serial8250_do_shutdown(struct uart_port *port) > > synchronize_irq(port->irq); > > - if (up->dma) > - serial8250_release_dma(up); > + serial8250_release_dma(up); > + up->dma = NULL; Shouldn't serial8250_release_dma() NULL it instead, so the callers need not to bother? thanks, -- js suse labs