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[PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

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  [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path Rameshwar Prasad Sahu <rsahu@apm.com> - 2015-08-20 12:40 +0200
    Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx  callback in cleanup path Vinod Koul <vinod.koul@intel.com> - 2015-08-21 10:40 +0200
      Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx  callback in cleanup path Vinod Koul <vinod.koul@intel.com> - 2015-08-21 10:50 +0200
        Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx  callback in cleanup path Rameshwar Sahu <rsahu@apm.com> - 2015-08-21 11:00 +0200
      Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx  callback in cleanup path Rameshwar Sahu <rsahu@apm.com> - 2015-08-21 10:50 +0200

#1210404 — [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

This patch fixes the an locking issue where client callback performs
further submission.

Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
---
 drivers/dma/xgene-dma.c | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index d1c8809..0b82bc0 100644
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -763,12 +763,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
 	struct xgene_dma_ring *ring = &chan->rx_ring;
 	struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
 	struct xgene_dma_desc_hw *desc_hw;
+	struct list_head ld_completed;
 	u8 status;

+	INIT_LIST_HEAD(&ld_completed);
+
+	spin_lock_bh(&chan->lock);
+
 	/* Clean already completed and acked descriptors */
 	xgene_dma_clean_completed_descriptor(chan);

-	/* Run the callback for each descriptor, in order */
+	/* Move all completed descriptors to ld completed queue, in order */
 	list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
 		/* Get subsequent hw descriptor from DMA rx ring */
 		desc_hw = &ring->desc_hw[ring->head];
@@ -811,15 +816,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
 		/* Mark this hw descriptor as processed */
 		desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);

-		xgene_dma_run_tx_complete_actions(chan, desc_sw);
-
-		xgene_dma_clean_running_descriptor(chan, desc_sw);
-
 		/*
 		 * Decrement the pending transaction count
 		 * as we have processed one
 		 */
 		chan->pending--;
+
+		/*
+		 * Delete this node from ld running queue and append it to
+		 * ld completed queue for further processing
+		 */
+		list_move_tail(&desc_sw->node, &ld_completed);
 	}

 	/*
@@ -828,6 +835,14 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
 	 * ahead and free the descriptors below.
 	 */
 	xgene_chan_xfer_ld_pending(chan);
+
+	spin_unlock_bh(&chan->lock);
+
+	/* Run the callback for each descriptor, in order */
+	list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
+		xgene_dma_run_tx_complete_actions(chan, desc_sw);
+		xgene_dma_clean_running_descriptor(chan, desc_sw);
+	}
 }

 static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
@@ -876,11 +891,11 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
 	if (!chan->desc_pool)
 		return;

-	spin_lock_bh(&chan->lock);
-
 	/* Process all running descriptor */
 	xgene_dma_cleanup_descriptors(chan);

+	spin_lock_bh(&chan->lock);
+
 	/* Clean all link descriptor queues */
 	xgene_dma_free_desc_list(chan, &chan->ld_pending);
 	xgene_dma_free_desc_list(chan, &chan->ld_running);
@@ -1200,15 +1215,11 @@ static void xgene_dma_tasklet_cb(unsigned long data)
 {
 	struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;

-	spin_lock_bh(&chan->lock);
-
 	/* Run all cleanup for descriptors which have been completed */
 	xgene_dma_cleanup_descriptors(chan);

 	/* Re-enable DMA channel IRQ */
 	enable_irq(chan->rx_irq);
-
-	spin_unlock_bh(&chan->lock);
 }

 static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
--
1.8.2.1

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#1211014 — Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

On Thu, Aug 20, 2015 at 04:00:56PM +0530, Rameshwar Prasad Sahu wrote:
> This patch fixes the an locking issue where client callback performs
		^^^^^^^^^^^^
??

> further submission.
Do you men you are preventing that or fixing for this to be allowed?

> 
> Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
> ---
>  drivers/dma/xgene-dma.c | 33 ++++++++++++++++++++++-----------
>  1 file changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
> index d1c8809..0b82bc0 100644
> --- a/drivers/dma/xgene-dma.c
> +++ b/drivers/dma/xgene-dma.c
> @@ -763,12 +763,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>  	struct xgene_dma_ring *ring = &chan->rx_ring;
>  	struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
>  	struct xgene_dma_desc_hw *desc_hw;
> +	struct list_head ld_completed;
>  	u8 status;
> 
> +	INIT_LIST_HEAD(&ld_completed);
> +
> +	spin_lock_bh(&chan->lock);
> +
>  	/* Clean already completed and acked descriptors */
>  	xgene_dma_clean_completed_descriptor(chan);
> 
> -	/* Run the callback for each descriptor, in order */
> +	/* Move all completed descriptors to ld completed queue, in order */
>  	list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
>  		/* Get subsequent hw descriptor from DMA rx ring */
>  		desc_hw = &ring->desc_hw[ring->head];
> @@ -811,15 +816,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>  		/* Mark this hw descriptor as processed */
>  		desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
> 
> -		xgene_dma_run_tx_complete_actions(chan, desc_sw);
> -
> -		xgene_dma_clean_running_descriptor(chan, desc_sw);
> -
>  		/*
>  		 * Decrement the pending transaction count
>  		 * as we have processed one
>  		 */
>  		chan->pending--;
> +
> +		/*
> +		 * Delete this node from ld running queue and append it to
> +		 * ld completed queue for further processing
> +		 */
> +		list_move_tail(&desc_sw->node, &ld_completed);
>  	}
> 
>  	/*
> @@ -828,6 +835,14 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>  	 * ahead and free the descriptors below.
>  	 */
>  	xgene_chan_xfer_ld_pending(chan);
> +
> +	spin_unlock_bh(&chan->lock);
> +
> +	/* Run the callback for each descriptor, in order */
> +	list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
> +		xgene_dma_run_tx_complete_actions(chan, desc_sw);
> +		xgene_dma_clean_running_descriptor(chan, desc_sw);
> +	}
>  }
> 
>  static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
> @@ -876,11 +891,11 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
>  	if (!chan->desc_pool)
>  		return;
> 
> -	spin_lock_bh(&chan->lock);
> -
>  	/* Process all running descriptor */
>  	xgene_dma_cleanup_descriptors(chan);
> 
> +	spin_lock_bh(&chan->lock);
> +
>  	/* Clean all link descriptor queues */
>  	xgene_dma_free_desc_list(chan, &chan->ld_pending);
>  	xgene_dma_free_desc_list(chan, &chan->ld_running);
> @@ -1200,15 +1215,11 @@ static void xgene_dma_tasklet_cb(unsigned long data)
>  {
>  	struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
> 
> -	spin_lock_bh(&chan->lock);
> -
>  	/* Run all cleanup for descriptors which have been completed */
>  	xgene_dma_cleanup_descriptors(chan);
> 
>  	/* Re-enable DMA channel IRQ */
>  	enable_irq(chan->rx_irq);
> -
> -	spin_unlock_bh(&chan->lock);
>  }
> 
>  static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
> --
> 1.8.2.1
> 

-- 
~Vinod
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#1211017 — Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

On Fri, Aug 21, 2015 at 02:15:08PM +0530, Rameshwar Sahu wrote:
> Hi Vinod,
> 
> On Fri, Aug 21, 2015 at 2:09 PM, Vinod Koul <vinod.koul@intel.com> wrote:
> > On Thu, Aug 20, 2015 at 04:00:56PM +0530, Rameshwar Prasad Sahu wrote:
> >> This patch fixes the an locking issue where client callback performs
> >                 ^^^^^^^^^^^^
> > ??
> >
> >> further submission.
> > Do you men you are preventing that or fixing for this to be allowed?
> 
> Fixing lock to allow client to submit further request in there
> callback routine if they would like.

Okay please fix the changelog to make it clear :)

-- 
~Vinod

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#1211024 — Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

On Fri, Aug 21, 2015 at 2:21 PM, Vinod Koul <vinod.koul@intel.com> wrote:
> On Fri, Aug 21, 2015 at 02:15:08PM +0530, Rameshwar Sahu wrote:
>> Hi Vinod,
>>
>> On Fri, Aug 21, 2015 at 2:09 PM, Vinod Koul <vinod.koul@intel.com> wrote:
>> > On Thu, Aug 20, 2015 at 04:00:56PM +0530, Rameshwar Prasad Sahu wrote:
>> >> This patch fixes the an locking issue where client callback performs
>> >                 ^^^^^^^^^^^^
>> > ??
>> >
>> >> further submission.
>> > Do you men you are preventing that or fixing for this to be allowed?
>>
>> Fixing lock to allow client to submit further request in there
>> callback routine if they would like.
>
> Okay please fix the changelog to make it clear :)

Okay Vinod

>
> --
> ~Vinod
>
> --
> To unsubscribe from this list: send the line "unsubscribe dmaengine" in
> the body of a message to majordomo@vger.kernel.org
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#1211021 — Re: [PATCH] dmaengine: xgene-dma: Fix holding lock while calling tx callback in cleanup path

Hi Vinod,

On Fri, Aug 21, 2015 at 2:09 PM, Vinod Koul <vinod.koul@intel.com> wrote:
> On Thu, Aug 20, 2015 at 04:00:56PM +0530, Rameshwar Prasad Sahu wrote:
>> This patch fixes the an locking issue where client callback performs
>                 ^^^^^^^^^^^^
> ??
>
>> further submission.
> Do you men you are preventing that or fixing for this to be allowed?

Fixing lock to allow client to submit further request in there
callback routine if they would like.
>
>>
>> Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
>> ---
>>  drivers/dma/xgene-dma.c | 33 ++++++++++++++++++++++-----------
>>  1 file changed, 22 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
>> index d1c8809..0b82bc0 100644
>> --- a/drivers/dma/xgene-dma.c
>> +++ b/drivers/dma/xgene-dma.c
>> @@ -763,12 +763,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>>       struct xgene_dma_ring *ring = &chan->rx_ring;
>>       struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
>>       struct xgene_dma_desc_hw *desc_hw;
>> +     struct list_head ld_completed;
>>       u8 status;
>>
>> +     INIT_LIST_HEAD(&ld_completed);
>> +
>> +     spin_lock_bh(&chan->lock);
>> +
>>       /* Clean already completed and acked descriptors */
>>       xgene_dma_clean_completed_descriptor(chan);
>>
>> -     /* Run the callback for each descriptor, in order */
>> +     /* Move all completed descriptors to ld completed queue, in order */
>>       list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
>>               /* Get subsequent hw descriptor from DMA rx ring */
>>               desc_hw = &ring->desc_hw[ring->head];
>> @@ -811,15 +816,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>>               /* Mark this hw descriptor as processed */
>>               desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
>>
>> -             xgene_dma_run_tx_complete_actions(chan, desc_sw);
>> -
>> -             xgene_dma_clean_running_descriptor(chan, desc_sw);
>> -
>>               /*
>>                * Decrement the pending transaction count
>>                * as we have processed one
>>                */
>>               chan->pending--;
>> +
>> +             /*
>> +              * Delete this node from ld running queue and append it to
>> +              * ld completed queue for further processing
>> +              */
>> +             list_move_tail(&desc_sw->node, &ld_completed);
>>       }
>>
>>       /*
>> @@ -828,6 +835,14 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>>        * ahead and free the descriptors below.
>>        */
>>       xgene_chan_xfer_ld_pending(chan);
>> +
>> +     spin_unlock_bh(&chan->lock);
>> +
>> +     /* Run the callback for each descriptor, in order */
>> +     list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
>> +             xgene_dma_run_tx_complete_actions(chan, desc_sw);
>> +             xgene_dma_clean_running_descriptor(chan, desc_sw);
>> +     }
>>  }
>>
>>  static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
>> @@ -876,11 +891,11 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
>>       if (!chan->desc_pool)
>>               return;
>>
>> -     spin_lock_bh(&chan->lock);
>> -
>>       /* Process all running descriptor */
>>       xgene_dma_cleanup_descriptors(chan);
>>
>> +     spin_lock_bh(&chan->lock);
>> +
>>       /* Clean all link descriptor queues */
>>       xgene_dma_free_desc_list(chan, &chan->ld_pending);
>>       xgene_dma_free_desc_list(chan, &chan->ld_running);
>> @@ -1200,15 +1215,11 @@ static void xgene_dma_tasklet_cb(unsigned long data)
>>  {
>>       struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
>>
>> -     spin_lock_bh(&chan->lock);
>> -
>>       /* Run all cleanup for descriptors which have been completed */
>>       xgene_dma_cleanup_descriptors(chan);
>>
>>       /* Re-enable DMA channel IRQ */
>>       enable_irq(chan->rx_irq);
>> -
>> -     spin_unlock_bh(&chan->lock);
>>  }
>>
>>  static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
>> --
>> 1.8.2.1
>>
>
> --
> ~Vinod
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