From patchwork Wed Jun 20 11:01:01 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: 10476979 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 0964F60383 for ; Wed, 20 Jun 2018 11:02:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EE63D28AD7 for ; Wed, 20 Jun 2018 11:02:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E2FD628B99; Wed, 20 Jun 2018 11:02:05 +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 9300728AD7 for ; Wed, 20 Jun 2018 11:02:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754190AbeFTLBp (ORCPT ); Wed, 20 Jun 2018 07:01:45 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:59939 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752787AbeFTLBn (ORCPT ); Wed, 20 Jun 2018 07:01:43 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1fVarr-0003m6-NY; Wed, 20 Jun 2018 13:01:39 +0200 From: Sebastian Andrzej Siewior To: linux-media@vger.kernel.org Cc: Mauro Carvalho Chehab , linux-usb@vger.kernel.org, tglx@linutronix.de, Sebastian Andrzej Siewior , Hans Verkuil Subject: [PATCH 23/27] media: usbtv: use irqsave() in USB's complete callback Date: Wed, 20 Jun 2018 13:01:01 +0200 Message-Id: <20180620110105.19955-24-bigeasy@linutronix.de> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180620110105.19955-1-bigeasy@linutronix.de> References: <20180620110105.19955-1-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: Mauro Carvalho Chehab Cc: Hans Verkuil Signed-off-by: Sebastian Andrzej Siewior --- drivers/media/usb/usbtv/usbtv-audio.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/usbtv/usbtv-audio.c b/drivers/media/usb/usbtv/usbtv-audio.c index 2c2ca77fa01f..4ce38246ed64 100644 --- a/drivers/media/usb/usbtv/usbtv-audio.c +++ b/drivers/media/usb/usbtv/usbtv-audio.c @@ -126,6 +126,7 @@ static void usbtv_audio_urb_received(struct urb *urb) struct snd_pcm_runtime *runtime = substream->runtime; size_t i, frame_bytes, chunk_length, buffer_pos, period_pos; int period_elapsed; + unsigned long flags; void *urb_current; switch (urb->status) { @@ -179,12 +180,12 @@ static void usbtv_audio_urb_received(struct urb *urb) } } - snd_pcm_stream_lock(substream); + snd_pcm_stream_lock_irqsave(substream, flags); chip->snd_buffer_pos = buffer_pos; chip->snd_period_pos = period_pos; - snd_pcm_stream_unlock(substream); + snd_pcm_stream_unlock_irqrestore(substream, flags); if (period_elapsed) snd_pcm_period_elapsed(substream);