Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751883AbdIUOGX (ORCPT ); Thu, 21 Sep 2017 10:06:23 -0400 Received: from mail-wm0-f47.google.com ([74.125.82.47]:49649 "EHLO mail-wm0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751864AbdIUOGR (ORCPT ); Thu, 21 Sep 2017 10:06:17 -0400 X-Google-Smtp-Source: AOwi7QAOU5E5bLb0pX6E/YavlM+N/aUWe/NjPbIJfWRJs9YJnLt+rmdEJjg7EqSZe1JSUsFhvwF7xA== From: Michal Nazarewicz To: Kees Cook , Thomas Gleixner Cc: Kees Cook , Felipe Balbi , Greg Kroah-Hartman , Raviteja Garimella , "Gustavo A. R. Silva" , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 27/31] usb/gadget/snps_udc_core: Remove struct timer_list.data use In-Reply-To: <1505950075-50223-28-git-send-email-keescook@chromium.org> Organization: http://mina86.com/ References: <1505950075-50223-1-git-send-email-keescook@chromium.org> <1505950075-50223-28-git-send-email-keescook@chromium.org> Face: 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 X-Face: -TR8(rDTHy/(xl?SfWd1|3:TTgDIatE^t'vop%*gVg[kn$t{EpK(P"VQ=~T2#ysNmJKN$"yTRLB4YQs$4{[.]Fc1)*O]3+XO^oXM>Q#b^ix,O)Zbn)q[y06$`e3?C)`CwR9y5riE=fv^X@x$y?D:XO6L&x4f-}}I4=VRNwiA^t1-ZrVK^07.Pi/57c_du'& OpenPGP: id=AC1F5F5CD41888F8CC8458582060401250751FF4; url=http://mina86.com/mina86.pub X-Hashcash: 1:20:170921:garsilva@embeddedor.com::i3jdpwLrkpUvFBCs:0000000000000000000000000000000000000005dD X-Hashcash: 1:20:170921:keescook@chromium.org::HLm2Dqv0VXxyKGZ7:000000000000000000000000000000000000000002zc X-Hashcash: 1:20:170921:gregkh@linuxfoundation.org::I+o7Iocdzlha2mK4:0000000000000000000000000000000000010Ac X-Hashcash: 1:20:170921:linux-kernel@vger.kernel.org::JdjUnKzGD/gQ6ySZ:0000000000000000000000000000000001xu7 X-Hashcash: 1:20:170921:balbi@kernel.org::EQV5HmUKKMN9TaBr:01vtx X-Hashcash: 1:20:170921:keescook@chromium.org::yl6OOFMmvgEvvBJe:00000000000000000000000000000000000000002m0C X-Hashcash: 1:20:170921:raviteja.garimella@broadcom.com::QoefhMrs61sF75G/:0000000000000000000000000000002HK5 X-Hashcash: 1:20:170921:tglx@linutronix.de::jYWHSk3BMeYrGsGA:00000000000000000000000000000000000000000009tqh X-Hashcash: 1:20:170921:linux-usb@vger.kernel.org::72TFgWIwojvVpA8I:000000000000000000000000000000000000ApPw Date: Thu, 21 Sep 2017 16:06:13 +0200 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v8LE6QDi006517 Content-Length: 2380 Lines: 68 On Wed, Sep 20 2017, Kees Cook wrote: > If the probe fails, udc_remove() will not be called, so there is no > reason to make del_timer_sync() calls conditional. As a result, use of > the .data field can be dropped, in support of making removing this field > entirely from struct timer_list. > > Cc: Felipe Balbi > Cc: Greg Kroah-Hartman > Cc: Raviteja Garimella > Cc: Michal Nazarewicz Acked-by: Michal Nazarewicz > Cc: "Gustavo A. R. Silva" > Cc: linux-usb@vger.kernel.org > Signed-off-by: Kees Cook > --- > drivers/usb/gadget/udc/snps_udc_core.c | 14 ++++---------- > 1 file changed, 4 insertions(+), 10 deletions(-) > > diff --git a/drivers/usb/gadget/udc/snps_udc_core.c b/drivers/usb/gadget/udc/snps_udc_core.c > index 5460e5ba1c3c..e05bdc16e1e3 100644 > --- a/drivers/usb/gadget/udc/snps_udc_core.c > +++ b/drivers/usb/gadget/udc/snps_udc_core.c > @@ -3067,14 +3067,12 @@ void udc_remove(struct udc *dev) > stop_timer++; > if (timer_pending(&udc_timer)) > wait_for_completion(&on_exit); > - if (udc_timer.data) > - del_timer_sync(&udc_timer); > + del_timer_sync(&udc_timer); > /* remove pollstall timer */ > stop_pollstall_timer++; > if (timer_pending(&udc_pollstall_timer)) > wait_for_completion(&on_pollstall_exit); > - if (udc_pollstall_timer.data) > - del_timer_sync(&udc_pollstall_timer); > + del_timer_sync(&udc_pollstall_timer); > udc = NULL; > } > EXPORT_SYMBOL_GPL(udc_remove); > @@ -3164,10 +3162,6 @@ int udc_probe(struct udc *dev) > u32 reg; > int retval; > > - /* mark timer as not initialized */ > - udc_timer.data = 0; > - udc_pollstall_timer.data = 0; > - > /* device struct setup */ > dev->gadget.ops = &udc_ops; > > @@ -3207,8 +3201,8 @@ int udc_probe(struct udc *dev) > goto finished; > > /* timer init */ > - setup_timer(&udc_timer, udc_timer_function, 1); > - setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 1); > + setup_timer(&udc_timer, udc_timer_function, 0); > + setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 0); > > /* set SD */ > reg = readl(&dev->regs->ctl); -- Best regards ミハウ “????????????????86” ナザレヴイツ «If at first you don’t succeed, give up skydiving»