From patchwork Sun Jul 1 15:39:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 10498755 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E60BE6035E for ; Sun, 1 Jul 2018 15:39:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D69F8288D9 for ; Sun, 1 Jul 2018 15:39:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CB1CF288E7; Sun, 1 Jul 2018 15:39:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E178288D9 for ; Sun, 1 Jul 2018 15:39:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752449AbeGAPjn (ORCPT ); Sun, 1 Jul 2018 11:39:43 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:35874 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752424AbeGAPjg (ORCPT ); Sun, 1 Jul 2018 11:39:36 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1fZeRo-0006z1-Pz; Sun, 01 Jul 2018 17:39:32 +0200 From: Sebastian Andrzej Siewior To: linux-media@vger.kernel.org Cc: tglx@linutronix.de, Mauro Carvalho Chehab , linux-usb@vger.kernel.org, Sebastian Andrzej Siewior Subject: [PATCH REPOST 4/5] media: tm6000: use irqsave() in USB's complete callback Date: Sun, 1 Jul 2018 17:39:20 +0200 Message-Id: <20180701153921.13129-5-bigeasy@linutronix.de> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180701153921.13129-1-bigeasy@linutronix.de> References: <20180701153921.13129-1-bigeasy@linutronix.de> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives. Cc: Mauro Carvalho Chehab Signed-off-by: Sebastian Andrzej Siewior --- drivers/media/usb/tm6000/tm6000-video.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/tm6000/tm6000-video.c b/drivers/media/usb/tm6000/tm6000-video.c index 96055de6e8ce..7d268f2404e1 100644 --- a/drivers/media/usb/tm6000/tm6000-video.c +++ b/drivers/media/usb/tm6000/tm6000-video.c @@ -419,6 +419,7 @@ static void tm6000_irq_callback(struct urb *urb) { struct tm6000_dmaqueue *dma_q = urb->context; struct tm6000_core *dev = container_of(dma_q, struct tm6000_core, vidq); + unsigned long flags; int i; switch (urb->status) { @@ -436,9 +437,9 @@ static void tm6000_irq_callback(struct urb *urb) break; } - spin_lock(&dev->slock); + spin_lock_irqsave(&dev->slock, flags); tm6000_isoc_copy(urb); - spin_unlock(&dev->slock); + spin_unlock_irqrestore(&dev->slock, flags); /* Reset urb buffers */ for (i = 0; i < urb->number_of_packets; i++) {