From patchwork Sun Jul 1 15:39:19 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: 10498757 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 03B166035E for ; Sun, 1 Jul 2018 15:39:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E5C84288E7 for ; Sun, 1 Jul 2018 15:39:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DA6E6288E8; Sun, 1 Jul 2018 15:39:48 +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=unavailable 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 7A31D288D9 for ; Sun, 1 Jul 2018 15:39:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752513AbeGAPjn (ORCPT ); Sun, 1 Jul 2018 11:39:43 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:35876 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752449AbeGAPjg (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-0006z1-2U; 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 , Hans Verkuil Subject: [PATCH REPOST 3/5] media: go7007: use irqsave() in USB's complete callback Date: Sun, 1 Jul 2018 17:39:19 +0200 Message-Id: <20180701153921.13129-4-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-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@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: Hans Verkuil Cc: Mauro Carvalho Chehab Signed-off-by: Sebastian Andrzej Siewior --- drivers/media/usb/go7007/go7007-driver.c | 9 +++++---- drivers/media/usb/go7007/snd-go7007.c | 11 ++++++----- 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/media/usb/go7007/go7007-driver.c b/drivers/media/usb/go7007/go7007-driver.c index 05b1126f263e..62aeebcdd7f7 100644 --- a/drivers/media/usb/go7007/go7007-driver.c +++ b/drivers/media/usb/go7007/go7007-driver.c @@ -448,13 +448,14 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf { u32 *bytesused; struct go7007_buffer *vb_tmp = NULL; + unsigned long flags; if (vb == NULL) { - spin_lock(&go->spinlock); + spin_lock_irqsave(&go->spinlock, flags); if (!list_empty(&go->vidq_active)) vb = go->active_buf = list_first_entry(&go->vidq_active, struct go7007_buffer, list); - spin_unlock(&go->spinlock); + spin_unlock_irqrestore(&go->spinlock, flags); go->next_seq++; return vb; } @@ -468,7 +469,7 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf vb->vb.vb2_buf.timestamp = ktime_get_ns(); vb_tmp = vb; - spin_lock(&go->spinlock); + spin_lock_irqsave(&go->spinlock, flags); list_del(&vb->list); if (list_empty(&go->vidq_active)) vb = NULL; @@ -476,7 +477,7 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf vb = list_first_entry(&go->vidq_active, struct go7007_buffer, list); go->active_buf = vb; - spin_unlock(&go->spinlock); + spin_unlock_irqrestore(&go->spinlock, flags); vb2_buffer_done(&vb_tmp->vb.vb2_buf, VB2_BUF_STATE_DONE); return vb; } diff --git a/drivers/media/usb/go7007/snd-go7007.c b/drivers/media/usb/go7007/snd-go7007.c index f84a2130f033..137fc253b122 100644 --- a/drivers/media/usb/go7007/snd-go7007.c +++ b/drivers/media/usb/go7007/snd-go7007.c @@ -75,13 +75,14 @@ static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length) struct go7007_snd *gosnd = go->snd_context; struct snd_pcm_runtime *runtime = gosnd->substream->runtime; int frames = bytes_to_frames(runtime, length); + unsigned long flags; - spin_lock(&gosnd->lock); + spin_lock_irqsave(&gosnd->lock, flags); gosnd->hw_ptr += frames; if (gosnd->hw_ptr >= runtime->buffer_size) gosnd->hw_ptr -= runtime->buffer_size; gosnd->avail += frames; - spin_unlock(&gosnd->lock); + spin_unlock_irqrestore(&gosnd->lock, flags); if (gosnd->w_idx + length > runtime->dma_bytes) { int cpy = runtime->dma_bytes - gosnd->w_idx; @@ -92,13 +93,13 @@ static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length) } memcpy(runtime->dma_area + gosnd->w_idx, buf, length); gosnd->w_idx += length; - spin_lock(&gosnd->lock); + spin_lock_irqsave(&gosnd->lock, flags); if (gosnd->avail < runtime->period_size) { - spin_unlock(&gosnd->lock); + spin_unlock_irqrestore(&gosnd->lock, flags); return; } gosnd->avail -= runtime->period_size; - spin_unlock(&gosnd->lock); + spin_unlock_irqrestore(&gosnd->lock, flags); if (gosnd->capturing) snd_pcm_period_elapsed(gosnd->substream); }