From patchwork Tue Jul 10 16:18:31 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: 10517307 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 001776032C for ; Tue, 10 Jul 2018 16:19:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E254A29120 for ; Tue, 10 Jul 2018 16:19:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D6D5329140; Tue, 10 Jul 2018 16:19:09 +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 77CC829120 for ; Tue, 10 Jul 2018 16:19:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934407AbeGJQS7 (ORCPT ); Tue, 10 Jul 2018 12:18:59 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:36992 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934415AbeGJQS5 (ORCPT ); Tue, 10 Jul 2018 12:18:57 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1fcvLp-0000lx-70; Tue, 10 Jul 2018 18:18:53 +0200 From: Sebastian Andrzej Siewior To: linux-media@vger.kernel.org Cc: tglx@linutronix.de, Mauro Carvalho Chehab , linux-usb@vger.kernel.org, Greg Kroah-Hartman , Sebastian Andrzej Siewior , Hans Verkuil Subject: [PATCH 2nd REPOST 3/5] media: go7007: use irqsave() in USB's complete callback Date: Tue, 10 Jul 2018 18:18:31 +0200 Message-Id: <20180710161833.2435-4-bigeasy@linutronix.de> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180710161833.2435-1-bigeasy@linutronix.de> References: <20180710161833.2435-1-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); }