From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: linux-media@vger.kernel.org Cc: tglx@linutronix.de, Mauro Carvalho Chehab <mchehab@kernel.org>, linux-usb@vger.kernel.org, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Hans Verkuil <hans.verkuil@cisco.com> Subject: [PATCH REPOST 3/5] media: go7007: use irqsave() in USB's complete callback Date: Sun, 1 Jul 2018 17:39:19 +0200 [thread overview] Message-ID: <20180701153921.13129-4-bigeasy@linutronix.de> (raw) In-Reply-To: <20180701153921.13129-1-bigeasy@linutronix.de> 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 <hans.verkuil@cisco.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- 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); } -- 2.18.0
WARNING: multiple messages have this Message-ID (diff)
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: linux-media@vger.kernel.org Cc: tglx@linutronix.de, Mauro Carvalho Chehab <mchehab@kernel.org>, linux-usb@vger.kernel.org, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Hans Verkuil <hans.verkuil@cisco.com> Subject: [REPOST,3/5] media: go7007: use irqsave() in USB's complete callback Date: Sun, 1 Jul 2018 17:39:19 +0200 [thread overview] Message-ID: <20180701153921.13129-4-bigeasy@linutronix.de> (raw) 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 <hans.verkuil@cisco.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- 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); }
next prev parent reply other threads:[~2018-07-01 15:39 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-01 15:39 [PATCH REPOST 0/5] media: use irqsave() in USB's complete callback Sebastian Andrzej Siewior 2018-07-01 15:39 ` [PATCH REPOST 1/5] media: cx231xx: " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [REPOST,1/5] " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [PATCH REPOST 2/5] media: em28xx-audio: " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [REPOST,2/5] " Sebastian Andrzej Siewior 2018-07-01 15:39 ` Sebastian Andrzej Siewior [this message] 2018-07-01 15:39 ` [REPOST,3/5] media: go7007: " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [PATCH REPOST 4/5] media: tm6000: " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [REPOST,4/5] " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [PATCH REPOST 5/5] media: usbtv: " Sebastian Andrzej Siewior 2018-07-01 15:39 ` [REPOST,5/5] " Sebastian Andrzej Siewior
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