Merge tag 'dmaengine-fix-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine

Pull dmaengine fixes from Vinod Koul:

 - email address Update for Jie Hai

 - fix double increment of client_count in dma_chan_get()

 - idxd driver fixes: use after free, probe error handling and callback
   on wq disable

 - fix for qcom gpi driver GO tre

 - ptdma locking fix

 - tegra & imx-sdma mem leak fix

* tag 'dmaengine-fix-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  ptdma: pt_core_execute_cmd() should use spinlock
  dmaengine: tegra: Fix memory leak in terminate_all()
  dmaengine: xilinx_dma: call of_node_put() when breaking out of for_each_child_of_node()
  dmaengine: imx-sdma: Fix a possible memory leak in sdma_transfer_init
  dmaengine: Fix double increment of client_count in dma_chan_get()
  dmaengine: tegra210-adma: fix global intr clear
  Add exception protection processing for vd in axi_chan_handle_err function
  dmaengine: lgm: Move DT parsing after initialization
  MAINTAINERS: update Jie Hai's email address
  dmaengine: ti: k3-udma: Do conditional decrement of UDMA_CHAN_RT_PEER_BCNT_REG
  dmaengine: idxd: Do not call DMX TX callbacks during workqueue disable
  dmaengine: idxd: Prevent use after free on completion memory
  dmaengine: idxd: Let probe fail when workqueue cannot be enabled
  dmaengine: qcom: gpi: Set link_rx bit on GO TRE for rx operation

Author: torvalds

MAINTAINERS

@@ -9298,7 +9298,7 @@ F:	net/dsa/tag_hellcreek.c
 
 HISILICON DMA DRIVER
 M:	Zhou Wang <[email protected]>
-M:	Jie Hai <haijie1@hisilicon.com>
+M:	Jie Hai <haijie1@huawei.com>
 L:	[email protected]
 S:	Maintained
 F:	drivers/dma/hisi_dma.c

drivers/dma/dmaengine.c

@@ -451,7 +451,8 @@ static int dma_chan_get(struct dma_chan *chan)
 	/* The channel is already in use, update client count */
 	if (chan->client_count) {
 		__module_get(owner);
-		goto out;
+		chan->client_count++;
+		return 0;
 	}
 
 	if (!try_module_get(owner))
@@ -470,11 +471,11 @@ static int dma_chan_get(struct dma_chan *chan)
 			goto err_out;
 	}
 
+	chan->client_count++;
+
 	if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask))
 		balance_ref_count(chan);
 
-out:
-	chan->client_count++;
 	return 0;
 
 err_out:

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -1018,6 +1018,11 @@ static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
 
 	/* The bad descriptor currently is in the head of vc list */
 	vd = vchan_next_desc(&chan->vc);
+	if (!vd) {
+		dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
+			axi_chan_name(chan));
+		goto out;
+	}
 	/* Remove the completed descriptor from issued list */
 	list_del(&vd->node);
 
@@ -1032,6 +1037,7 @@ static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
 	/* Try to restart the controller */
 	axi_chan_start_first_queued(chan);
 
+out:
 	spin_unlock_irqrestore(&chan->vc.lock, flags);
 }
 

drivers/dma/idxd/device.c

@@ -1172,8 +1172,19 @@ static void idxd_flush_pending_descs(struct idxd_irq_entry *ie)
 	spin_unlock(&ie->list_lock);
 
 	list_for_each_entry_safe(desc, itr, &flist, list) {
+		struct dma_async_tx_descriptor *tx;
+
 		list_del(&desc->list);
 		ctype = desc->completion->status ? IDXD_COMPLETE_NORMAL : IDXD_COMPLETE_ABORT;
+		/*
+		 * wq is being disabled. Any remaining descriptors are
+		 * likely to be stuck and can be dropped. callback could
+		 * point to code that is no longer accessible, for example
+		 * if dmatest module has been unloaded.
+		 */
+		tx = &desc->txd;
+		tx->callback = NULL;
+		tx->callback_result = NULL;
 		idxd_dma_complete_txd(desc, ctype, true);
 	}
 }
@@ -1390,8 +1401,7 @@ int drv_enable_wq(struct idxd_wq *wq)
 err_irq:
 	idxd_wq_unmap_portal(wq);
 err_map_portal:
-	rc = idxd_wq_disable(wq, false);
-	if (rc < 0)
+	if (idxd_wq_disable(wq, false))
 		dev_dbg(dev, "wq %s disable failed\n", dev_name(wq_confdev(wq)));
 err:
 	return rc;
@@ -1408,11 +1418,11 @@ void drv_disable_wq(struct idxd_wq *wq)
 		dev_warn(dev, "Clients has claim on wq %d: %d\n",
 			 wq->id, idxd_wq_refcount(wq));
 
-	idxd_wq_free_resources(wq);
 	idxd_wq_unmap_portal(wq);
 	idxd_wq_drain(wq);
 	idxd_wq_free_irq(wq);
 	idxd_wq_reset(wq);
+	idxd_wq_free_resources(wq);
 	percpu_ref_exit(&wq->wq_active);
 	wq->type = IDXD_WQT_NONE;
 	wq->client_count = 0;

drivers/dma/imx-sdma.c

@@ -1521,10 +1521,12 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
 		sdma_config_ownership(sdmac, false, true, false);
 
 	if (sdma_load_context(sdmac))
-		goto err_desc_out;
+		goto err_bd_out;
 
 	return desc;
 
+err_bd_out:
+	sdma_free_bd(desc);
 err_desc_out:
 	kfree(desc);
 err_out:

drivers/dma/lgm/lgm-dma.c

@@ -914,7 +914,7 @@ static void ldma_dev_init(struct ldma_dev *d)
 	}
 }
 
-static int ldma_cfg_init(struct ldma_dev *d)
+static int ldma_parse_dt(struct ldma_dev *d)
 {
 	struct fwnode_handle *fwnode = dev_fwnode(d->dev);
 	struct ldma_port *p;
@@ -1661,10 +1661,6 @@ static int intel_ldma_probe(struct platform_device *pdev)
 		p->ldev = d;
 	}
 
-	ret = ldma_cfg_init(d);
-	if (ret)
-		return ret;
-
 	dma_dev->dev = &pdev->dev;
 
 	ch_mask = (unsigned long)d->channels_mask;
@@ -1675,6 +1671,10 @@ static int intel_ldma_probe(struct platform_device *pdev)
 			ldma_dma_init_v3X(j, d);
 	}
 
+	ret = ldma_parse_dt(d);
+	if (ret)
+		return ret;
+
 	dma_dev->device_alloc_chan_resources = ldma_alloc_chan_resources;
 	dma_dev->device_free_chan_resources = ldma_free_chan_resources;
 	dma_dev->device_terminate_all = ldma_terminate_all;

drivers/dma/ptdma/ptdma-dev.c

@@ -71,12 +71,13 @@ static int pt_core_execute_cmd(struct ptdma_desc *desc, struct pt_cmd_queue *cmd
 	bool soc = FIELD_GET(DWORD0_SOC, desc->dw0);
 	u8 *q_desc = (u8 *)&cmd_q->qbase[cmd_q->qidx];
 	u32 tail;
+	unsigned long flags;
 
 	if (soc) {
 		desc->dw0 |= FIELD_PREP(DWORD0_IOC, desc->dw0);
 		desc->dw0 &= ~DWORD0_SOC;
 	}
-	mutex_lock(&cmd_q->q_mutex);
+	spin_lock_irqsave(&cmd_q->q_lock, flags);
 
 	/* Copy 32-byte command descriptor to hw queue. */
 	memcpy(q_desc, desc, 32);
@@ -91,7 +92,7 @@ static int pt_core_execute_cmd(struct ptdma_desc *desc, struct pt_cmd_queue *cmd
 
 	/* Turn the queue back on using our cached control register */
 	pt_start_queue(cmd_q);
-	mutex_unlock(&cmd_q->q_mutex);
+	spin_unlock_irqrestore(&cmd_q->q_lock, flags);
 
 	return 0;
 }
@@ -199,7 +200,7 @@ int pt_core_init(struct pt_device *pt)
 
 	cmd_q->pt = pt;
 	cmd_q->dma_pool = dma_pool;
-	mutex_init(&cmd_q->q_mutex);
+	spin_lock_init(&cmd_q->q_lock);
 
 	/* Page alignment satisfies our needs for N <= 128 */
 	cmd_q->qsize = Q_SIZE(Q_DESC_SIZE);

drivers/dma/ptdma/ptdma.h

@@ -196,7 +196,7 @@ struct pt_cmd_queue {
 	struct ptdma_desc *qbase;
 
 	/* Aligned queue start address (per requirement) */
-	struct mutex q_mutex ____cacheline_aligned;
+	spinlock_t q_lock ____cacheline_aligned;
 	unsigned int qidx;
 
 	unsigned int qsize;

drivers/dma/qcom/gpi.c

@@ -1756,6 +1756,7 @@ static int gpi_create_spi_tre(struct gchan *chan, struct gpi_desc *desc,
 		tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
 		if (spi->cmd == SPI_RX) {
 			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOB);
+			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
 		} else if (spi->cmd == SPI_TX) {
 			tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
 		} else { /* SPI_DUPLEX */

drivers/dma/tegra186-gpc-dma.c

@@ -711,6 +711,7 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
 			return err;
 		}
 
+		vchan_terminate_vdesc(&tdc->dma_desc->vd);
 		tegra_dma_disable(tdc);
 		tdc->dma_desc = NULL;
 	}