Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753069AbcD0GiH (ORCPT ); Wed, 27 Apr 2016 02:38:07 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:24414 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752395AbcD0GiE (ORCPT ); Wed, 27 Apr 2016 02:38:04 -0400 Date: Wed, 27 Apr 2016 14:33:43 +0800 From: Jisheng Zhang To: Felipe Balbi , CC: , , , , Subject: Re: [RESEND PATCH v2 5/7] usb: xhci: plat: Remove checks for optional clock in error/remove path Message-ID: <20160427143343.6510ff57@xhacker> In-Reply-To: <87h9enpqdb.fsf@intel.com> References: <1461675460-2295-1-git-send-email-jszhang@marvell.com> <1461675460-2295-6-git-send-email-jszhang@marvell.com> <87h9enpqdb.fsf@intel.com> X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-04-27_03:,, signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1603290000 definitions=main-1604270101 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1693 Lines: 56 Dear Felipe, On Wed, 27 Apr 2016 08:33:52 +0300 Felipe Balbi wrote: > Jisheng Zhang writes: > > Commit 63589e92c2d9 ("clk: Ignore error and NULL pointers passed to > > clk_{unprepare, disable}()") allows NULL or error pointer to be passed > > unconditionally. > > > > This patch is to simplify probe error and remove code paths. > > this seems wrong to me. xhci->clk isn't initialized to NULL, it's either > initialized to a valid struct clk * or some ERR_PTR() value. Commit 63589e92c2d9 could also ignore error value ;) > > Care to explain ? > > > Signed-off-by: Jisheng Zhang > > --- > > drivers/usb/host/xhci-plat.c | 6 ++---- > > 1 file changed, 2 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c > > index 0e69712..83669d0 100644 > > --- a/drivers/usb/host/xhci-plat.c > > +++ b/drivers/usb/host/xhci-plat.c > > @@ -266,8 +266,7 @@ put_usb3_hcd: > > usb_put_hcd(xhci->shared_hcd); > > > > disable_clk: > > - if (!IS_ERR(clk)) > > - clk_disable_unprepare(clk); > > + clk_disable_unprepare(clk); > > > > put_hcd: > > usb_put_hcd(hcd); > > @@ -287,8 +286,7 @@ static int xhci_plat_remove(struct platform_device *dev) > > usb_remove_hcd(hcd); > > usb_put_hcd(xhci->shared_hcd); > > > > - if (!IS_ERR(clk)) > > - clk_disable_unprepare(clk); > > + clk_disable_unprepare(clk); > > usb_put_hcd(hcd); > > > > return 0; > > -- > > 2.8.1 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html >