Re: [PATCH v2 10/14] dmaengine: ti: New driver for K3 UDMA - split#3: alloc/free chan_resources

[Grygorii Strashko <grygorii.strashko@ti.com>]

On 30/07/2019 12:34, Peter Ujfalusi wrote:
> Split patch for review containing: channel rsource allocation and free
> functions.
> 
> DMA driver for
> Texas Instruments K3 NAVSS Unified DMA – Peripheral Root Complex (UDMA-P)
> 
> The UDMA-P is intended to perform similar (but significantly upgraded) functions
> as the packet-oriented DMA used on previous SoC devices. The UDMA-P module
> supports the transmission and reception of various packet types. The UDMA-P is
> architected to facilitate the segmentation and reassembly of SoC DMA data
> structure compliant packets to/from smaller data blocks that are natively
> compatible with the specific requirements of each connected peripheral. Multiple
> Tx and Rx channels are provided within the DMA which allow multiple segmentation
> or reassembly operations to be ongoing. The DMA controller maintains state
> information for each of the channels which allows packet segmentation and
> reassembly operations to be time division multiplexed between channels in order
> to share the underlying DMA hardware. An external DMA scheduler is used to
> control the ordering and rate at which this multiplexing occurs for Transmit
> operations. The ordering and rate of Receive operations is indirectly controlled
> by the order in which blocks are pushed into the DMA on the Rx PSI-L interface.
> 
> The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
> channels. Channels in the UDMA-P can be configured to be either Packet-Based or
> Third-Party channels on a channel by channel basis.
> 
> The initial driver supports:
> - MEM_TO_MEM (TR mode)
> - DEV_TO_MEM (Packet / TR mode)
> - MEM_TO_DEV (Packet / TR mode)
> - Cyclic (Packet / TR mode)
> - Metadata for descriptors
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>   drivers/dma/ti/k3-udma.c | 780 +++++++++++++++++++++++++++++++++++++++
>   1 file changed, 780 insertions(+)
> 
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index 52ccc6d46de9..0de38db03b8d 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -1039,6 +1039,786 @@ static irqreturn_t udma_udma_irq_handler(int irq, void *data)
>   	return IRQ_HANDLED;
>   }
>   
> +static struct udma_rflow *__udma_reserve_rflow(struct udma_dev *ud,
> +					       enum udma_tp_level tpl, int id)
> +{
> +	DECLARE_BITMAP(tmp, K3_UDMA_MAX_RFLOWS);
> +
> +	if (id >= 0) {
> +		if (test_bit(id, ud->rflow_map)) {
> +			dev_err(ud->dev, "rflow%d is in use\n", id);
> +			return ERR_PTR(-ENOENT);
> +		}
> +	} else {
> +		bitmap_or(tmp, ud->rflow_map, ud->rflow_map_reserved,
> +			  ud->rflow_cnt);
> +
> +		id = find_next_zero_bit(tmp, ud->rflow_cnt, ud->rchan_cnt);
> +		if (id >= ud->rflow_cnt)
> +			return ERR_PTR(-ENOENT);
> +	}
> +
> +	set_bit(id, ud->rflow_map);
> +	return &ud->rflows[id];
> +}
> +
> +#define UDMA_RESERVE_RESOURCE(res)					\
> +static struct udma_##res *__udma_reserve_##res(struct udma_dev *ud,	\
> +					       enum udma_tp_level tpl,	\
> +					       int id)			\
> +{									\
> +	if (id >= 0) {							\
> +		if (test_bit(id, ud->res##_map)) {			\
> +			dev_err(ud->dev, "res##%d is in use\n", id);	\
> +			return ERR_PTR(-ENOENT);			\
> +		}							\
> +	} else {							\
> +		int start;						\
> +									\
> +		if (tpl >= ud->match_data->tpl_levels)			\
> +			tpl = ud->match_data->tpl_levels - 1;		\
> +									\
> +		start = ud->match_data->level_start_idx[tpl];		\
> +									\
> +		id = find_next_zero_bit(ud->res##_map, ud->res##_cnt,	\
> +					start);				\
> +		if (id == ud->res##_cnt) {				\
> +			return ERR_PTR(-ENOENT);			\
> +		}							\
> +	}								\
> +									\
> +	set_bit(id, ud->res##_map);					\
> +	return &ud->res##s[id];						\
> +}
> +
> +UDMA_RESERVE_RESOURCE(tchan);
> +UDMA_RESERVE_RESOURCE(rchan);

Personally I'm not a fan of such a big macro, wouldn't be static functions better.
  

> +
> +static int udma_get_tchan(struct udma_chan *uc)
> +{
> +	struct udma_dev *ud = uc->ud;
> +
> +	if (uc->tchan) {
> +		dev_dbg(ud->dev, "chan%d: already have tchan%d allocated\n",
> +			uc->id, uc->tchan->id);
> +		return 0;
> +	}
> +
> +	uc->tchan = __udma_reserve_tchan(ud, uc->channel_tpl, -1);
> +	if (IS_ERR(uc->tchan))
> +		return PTR_ERR(uc->tchan);
> +
> +	return 0;
> +}
> +

[...]

> +
> +static int udma_tisci_channel_config(struct udma_chan *uc)
> +{
> +	struct udma_dev *ud = uc->ud;
> +	struct udma_tisci_rm *tisci_rm = &ud->tisci_rm;
> +	const struct ti_sci_rm_udmap_ops *tisci_ops = tisci_rm->tisci_udmap_ops;
> +	struct udma_tchan *tchan = uc->tchan;
> +	struct udma_rchan *rchan = uc->rchan;
> +	int ret = 0;
> +
> +	if (uc->dir == DMA_MEM_TO_MEM) {
> +		/* Non synchronized - mem to mem type of transfer */
> +		int tc_ring = k3_ringacc_get_ring_id(tchan->tc_ring);
> +		struct ti_sci_msg_rm_udmap_tx_ch_cfg req_tx = { 0 };
> +		struct ti_sci_msg_rm_udmap_rx_ch_cfg req_rx = { 0 };
> +
> +		req_tx.valid_params =
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_PAUSE_ON_ERR_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_FILT_EINFO_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_FILT_PSWORDS_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CHAN_TYPE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_SUPR_TDPKT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_FETCH_SIZE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CQ_QNUM_VALID;
> +
> +		req_tx.nav_id = tisci_rm->tisci_dev_id;
> +		req_tx.index = tchan->id;
> +		req_tx.tx_pause_on_err = 0;
> +		req_tx.tx_filt_einfo = 0;
> +		req_tx.tx_filt_pswords = 0;
> +		req_tx.tx_chan_type = TI_SCI_RM_UDMAP_CHAN_TYPE_3RDP_BCOPY_PBRR;
> +		req_tx.tx_supr_tdpkt = 0;
> +		req_tx.tx_fetch_size = sizeof(struct cppi5_desc_hdr_t) >> 2;
> +		req_tx.txcq_qnum = tc_ring;
> +
> +		ret = tisci_ops->tx_ch_cfg(tisci_rm->tisci, &req_tx);
> +		if (ret) {
> +			dev_err(ud->dev, "tchan%d cfg failed %d\n",
> +				tchan->id, ret);
> +			return ret;
> +		}
> +
> +		req_rx.valid_params =
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_PAUSE_ON_ERR_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_FETCH_SIZE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CQ_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CHAN_TYPE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_RX_IGNORE_SHORT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_RX_IGNORE_LONG_VALID;
> +
> +		req_rx.nav_id = tisci_rm->tisci_dev_id;
> +		req_rx.index = rchan->id;
> +		req_rx.rx_fetch_size = sizeof(struct cppi5_desc_hdr_t) >> 2;
> +		req_rx.rxcq_qnum = tc_ring;
> +		req_rx.rx_pause_on_err = 0;
> +		req_rx.rx_chan_type = TI_SCI_RM_UDMAP_CHAN_TYPE_3RDP_BCOPY_PBRR;
> +		req_rx.rx_ignore_short = 0;
> +		req_rx.rx_ignore_long = 0;Personally I'm not a fan of such a big macro.
> +
> +		ret = tisci_ops->rx_ch_cfg(tisci_rm->tisci, &req_rx);
> +		if (ret) {
> +			dev_err(ud->dev, "rchan%d alloc failed %d\n",
> +				rchan->id, ret);
> +			return ret;
> +		}
> +	} else {
> +		/* Slave transfer */
> +		u32 mode, fetch_size;
> +
> +		if (uc->pkt_mode) {
> +			mode = TI_SCI_RM_UDMAP_CHAN_TYPE_PKT_PBRR;
> +			fetch_size = cppi5_hdesc_calc_size(uc->needs_epib,
> +							   uc->psd_size, 0);
> +		} else {
> +			mode = TI_SCI_RM_UDMAP_CHAN_TYPE_3RDP_PBRR;
> +			fetch_size = sizeof(struct cppi5_desc_hdr_t);
> +		}
> +
> +		if (uc->dir == DMA_MEM_TO_DEV) {
> +			/* TX */
> +			int tc_ring = k3_ringacc_get_ring_id(tchan->tc_ring);
> +			struct ti_sci_msg_rm_udmap_tx_ch_cfg req_tx = { 0 };
> +
> +			req_tx.valid_params =
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_PAUSE_ON_ERR_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_FILT_EINFO_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_FILT_PSWORDS_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CHAN_TYPE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_TX_SUPR_TDPKT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_FETCH_SIZE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CQ_QNUM_VALID;
> +
> +			req_tx.nav_id = tisci_rm->tisci_dev_id;
> +			req_tx.index = tchan->id;
> +			req_tx.tx_pause_on_err = 0;
> +			req_tx.tx_filt_einfo = 0;
> +			req_tx.tx_filt_pswords = 0;
> +			req_tx.tx_chan_type = mode;
> +			req_tx.tx_supr_tdpkt = 0;
> +			req_tx.tx_fetch_size = fetch_size >> 2;
> +			req_tx.txcq_qnum = tc_ring;
> +
> +			ret = tisci_ops->tx_ch_cfg(tisci_rm->tisci, &req_tx);
> +			if (ret) {
> +				dev_err(ud->dev, "tchan%d cfg failed %d\n",
> +					tchan->id, ret);
> +				return ret;
> +			}
> +		} else {
> +			/* RX */
> +			int fd_ring = k3_ringacc_get_ring_id(rchan->fd_ring);
> +			int rx_ring = k3_ringacc_get_ring_id(rchan->r_ring);
> +			struct ti_sci_msg_rm_udmap_rx_ch_cfg req_rx = { 0 };
> +			struct ti_sci_msg_rm_udmap_flow_cfg flow_req = { 0 };
> +
> +			req_rx.valid_params =
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_PAUSE_ON_ERR_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_FETCH_SIZE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CQ_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_CHAN_TYPE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_RX_IGNORE_SHORT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_CH_RX_IGNORE_LONG_VALID;
> +
> +			req_rx.nav_id = tisci_rm->tisci_dev_id;
> +			req_rx.index = rchan->id;
> +			req_rx.rx_fetch_size =  fetch_size >> 2;
> +			req_rx.rxcq_qnum = rx_ring;
> +			req_rx.rx_pause_on_err = 0;
> +			req_rx.rx_chan_type = mode;
> +			req_rx.rx_ignore_short = 0;
> +			req_rx.rx_ignore_long = 0;
> +
> +			ret = tisci_ops->rx_ch_cfg(tisci_rm->tisci, &req_rx);
> +			if (ret) {
> +				dev_err(ud->dev, "rchan%d cfg failed %d\n",
> +					rchan->id, ret);
> +				return ret;
> +			}
> +
> +			flow_req.valid_params =
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_EINFO_PRESENT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_PSINFO_PRESENT_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_ERROR_HANDLING_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_DESC_TYPE_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_DEST_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_SRC_TAG_HI_SEL_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_SRC_TAG_LO_SEL_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_DEST_TAG_HI_SEL_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_DEST_TAG_LO_SEL_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_FDQ0_SZ0_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_FDQ1_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_FDQ2_QNUM_VALID |
> +			TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_FDQ3_QNUM_VALID;
> +
> +			flow_req.nav_id = tisci_rm->tisci_dev_id;
> +			flow_req.flow_index = rchan->id;
> +
> +			if (uc->needs_epib)
> +				flow_req.rx_einfo_present = 1;
> +			else
> +				flow_req.rx_einfo_present = 0;
> +			if (uc->psd_size)
> +				flow_req.rx_psinfo_present = 1;
> +			else
> +				flow_req.rx_psinfo_present = 0;
> +			flow_req.rx_error_handling = 1;
> +			flow_req.rx_desc_type = 0;
> +			flow_req.rx_dest_qnum = rx_ring;
> +			flow_req.rx_src_tag_hi_sel = 2;
> +			flow_req.rx_src_tag_lo_sel = 4;
> +			flow_req.rx_dest_tag_hi_sel = 5;
> +			flow_req.rx_dest_tag_lo_sel = 4;
> +			flow_req.rx_fdq0_sz0_qnum = fd_ring;
> +			flow_req.rx_fdq1_qnum = fd_ring;
> +			flow_req.rx_fdq2_qnum = fd_ring;
> +			flow_req.rx_fdq3_qnum = fd_ring;
> +
> +			ret = tisci_ops->rx_flow_cfg(tisci_rm->tisci,
> +						     &flow_req);
> +
> +			if (ret) {
> +				dev_err(ud->dev, "flow%d config failed: %d\n",
> +					rchan->id, ret);
> +				return ret;
> +			}
> +		}
> +	}
> +
> +	return 0;
> +}

Could you split above big function pls?

> +
> +static int udma_alloc_chan_resources(struct dma_chan *chan)
> +{
> +	struct udma_chan *uc = to_udma_chan(chan);
> +	struct udma_dev *ud = to_udma_dev(chan->device);
> +	const struct udma_match_data *match_data = ud->match_data;
> +	struct k3_ring *irq_ring;
> +	u32 irq_udma_idx;
> +	int ret;
> +
> +	if (uc->pkt_mode || uc->dir == DMA_MEM_TO_MEM) {
> +		uc->use_dma_pool = true;
> +		/* in case of MEM_TO_MEM we have maximum of two TRs */
> +		if (uc->dir == DMA_MEM_TO_MEM) {
> +			uc->hdesc_size = cppi5_trdesc_calc_size(
> +					sizeof(struct cppi5_tr_type15_t), 2);
> +			uc->pkt_mode = false;
> +		}
> +	}
> +
> +	if (uc->use_dma_pool) {
> +		uc->hdesc_pool = dma_pool_create(uc->name, ud->ddev.dev,
> +						 uc->hdesc_size, ud->desc_align,
> +						 0);
> +		if (!uc->hdesc_pool) {
> +			dev_err(ud->ddev.dev,
> +				"Descriptor pool allocation failed\n");
> +			uc->use_dma_pool = false;
> +			return -ENOMEM;
> +		}
> +	}
> +
> +	pm_runtime_get_sync(ud->ddev.dev);
> +
> +	/*
> +	 * Make sure that the completion is in a known state:
> +	 * No teardown, the channel is idle
> +	 */
> +	reinit_completion(&uc->teardown_completed);
> +	complete_all(&uc->teardown_completed);
> +	uc->state = UDMA_CHAN_IS_IDLE;
> +
> +	switch (uc->dir) {
> +	case DMA_MEM_TO_MEM:
> +		/* Non synchronized - mem to mem type of transfer */
> +		dev_dbg(uc->ud->dev, "%s: chan%d as MEM-to-MEM\n", __func__,
> +			uc->id);
> +
> +		ret = udma_get_chan_pair(uc);
> +		if (ret)
> +			return ret;
> +
> +		ret = udma_alloc_tx_resources(uc);
> +		if (ret)
> +			return ret;
> +
> +		ret = udma_alloc_rx_resources(uc);
> +		if (ret) {
> +			udma_free_tx_resources(uc);
> +			return ret;
> +		}
> +
> +		uc->src_thread = ud->psil_base + uc->tchan->id;
> +		uc->dst_thread = (ud->psil_base + uc->rchan->id) |
> +				 UDMA_PSIL_DST_THREAD_ID_OFFSET;
> +
> +		irq_ring = uc->tchan->tc_ring;
> +		irq_udma_idx = uc->tchan->id;
> +		break;
> +	case DMA_MEM_TO_DEV:
> +		/* Slave transfer synchronized - mem to dev (TX) trasnfer */
> +		dev_dbg(uc->ud->dev, "%s: chan%d as MEM-to-DEV\n", __func__,
> +			uc->id);
> +
> +		ret = udma_alloc_tx_resources(uc);
> +		if (ret) {
> +			uc->remote_thread_id = -1;
> +			return ret;
> +		}
> +
> +		uc->src_thread = ud->psil_base + uc->tchan->id;
> +		uc->dst_thread = uc->remote_thread_id;
> +		uc->dst_thread |= UDMA_PSIL_DST_THREAD_ID_OFFSET;
> +
> +		irq_ring = uc->tchan->tc_ring;
> +		irq_udma_idx = uc->tchan->id;
> +		break;
> +	case DMA_DEV_TO_MEM:
> +		/* Slave transfer synchronized - dev to mem (RX) trasnfer */
> +		dev_dbg(uc->ud->dev, "%s: chan%d as DEV-to-MEM\n", __func__,
> +			uc->id);
> +
> +		ret = udma_alloc_rx_resources(uc);
> +		if (ret) {
> +			uc->remote_thread_id = -1;
> +			return ret;
> +		}
> +
> +		uc->src_thread = uc->remote_thread_id;
> +		uc->dst_thread = (ud->psil_base + uc->rchan->id) |
> +				 UDMA_PSIL_DST_THREAD_ID_OFFSET;
> +
> +		irq_ring = uc->rchan->r_ring;
> +		irq_udma_idx = match_data->rchan_oes_offset + uc->rchan->id;
> +		break;
> +	default:
> +		/* Can not happen */
> +		dev_err(uc->ud->dev, "%s: chan%d invalid direction (%u)\n",
> +			__func__, uc->id, uc->dir);
> +		return -EINVAL;
> +	}
> +
> +	/* Configure channel(s), rflow via tisci */
> +	ret = udma_tisci_channel_config(uc);
> +	if (ret)
> +		goto err_res_free;
> +
> +	if (udma_is_chan_running(uc)) {
> +		dev_warn(ud->dev, "chan%d: is running!\n", uc->id);
> +		udma_stop(uc);
> +		if (udma_is_chan_running(uc)) {
> +			dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
> +			goto err_res_free;
> +		}
> +	}
> +
> +	/* PSI-L pairing */
> +	ret = navss_psil_pair(ud, uc->src_thread, uc->dst_thread);
> +	if (ret) {
> +		dev_err(ud->dev, "PSI-L pairing failed: 0x%04x -> 0x%04x\n",
> +			uc->src_thread, uc->dst_thread);
> +		goto err_res_free;
> +	}
> +
> +	uc->psil_paired = true;
> +
> +	uc->irq_num_ring = k3_ringacc_get_ring_irq_num(irq_ring);
> +	if (uc->irq_num_ring <= 0) {
> +		dev_err(ud->dev, "Failed to get ring irq (index: %u)\n",
> +			k3_ringacc_get_ring_id(irq_ring));
> +		ret = -EINVAL;
> +		goto err_psi_free;
> +	}
> +
> +	ret = request_irq(uc->irq_num_ring, udma_ring_irq_handler,
> +			  IRQF_TRIGGER_HIGH, uc->name, uc);
> +	if (ret) {
> +		dev_err(ud->dev, "chan%d: ring irq request failed\n", uc->id);
> +		goto err_irq_free;
> +	}
> +
> +	/* Event from UDMA (TR events) only needed for slave TR mode channels */
> +	if (is_slave_direction(uc->dir) && !uc->pkt_mode) {
> +		uc->irq_num_udma = ti_sci_inta_msi_get_virq(ud->dev,
> +							    irq_udma_idx);
> +		if (uc->irq_num_udma <= 0) {
> +			dev_err(ud->dev, "Failed to get udma irq (index: %u)\n",
> +				irq_udma_idx);
> +			free_irq(uc->irq_num_ring, uc);
> +			ret = -EINVAL;
> +			goto err_irq_free;
> +		}
> +
> +		ret = request_irq(uc->irq_num_udma, udma_udma_irq_handler, 0,
> +				  uc->name, uc);
> +		if (ret) {
> +			dev_err(ud->dev, "chan%d: UDMA irq request failed\n",
> +				uc->id);
> +			free_irq(uc->irq_num_ring, uc);
> +			goto err_irq_free;
> +		}
> +	} else {
> +		uc->irq_num_udma = 0;
> +	}
> +
> +	udma_reset_rings(uc);
> +
> +	return 0;
> +
> +err_irq_free:
> +	uc->irq_num_ring = 0;
> +	uc->irq_num_udma = 0;
> +err_psi_free:
> +	navss_psil_unpair(ud, uc->src_thread, uc->dst_thread);
> +	uc->psil_paired = false;
> +err_res_free:
> +	udma_free_tx_resources(uc);
> +	udma_free_rx_resources(uc);
> +
> +	uc->remote_thread_id = -1;
> +	uc->dir = DMA_MEM_TO_MEM;
> +	uc->pkt_mode = false;
> +	uc->static_tr_type = 0;
> +	uc->enable_acc32 = 0;
> +	uc->enable_burst = 0;
> +	uc->channel_tpl = 0;
> +	uc->psd_size = 0;
> +	uc->metadata_size = 0;
> +	uc->hdesc_size = 0;
> +
> +	if (uc->use_dma_pool) {
> +		dma_pool_destroy(uc->hdesc_pool);
> +		uc->use_dma_pool = false;
> +	}
> +
> +	return ret;
> +}
> +

[...]

-- 
Best regards,
grygorii