[PATCH 02/10] dmaengine: ae4dma: Unregister DMA engine in ae4_pci_remove()

[Lee Jones <lee@kernel.org>]

ae4_core_init() registers the DMA device and creates the descriptor slab
cache via pt_dmaengine_register(), but ae4_pci_remove() never calls
pt_dmaengine_unregister(), leaking the descriptor cache and leaving a
dangling DMA device registered after device removal.

Export pt_dmaengine_unregister() and call it from ae4_pci_remove().

Fixes: 98f5a4432622 ("dmaengine: ae4dma: Register AE4DMA using pt_dmaengine_register")
Closes: https://sashiko.dev/#/bug/linux-10d41112-e133-4bc5-8e53-b3e96592c70d
Cc: stable@vger.kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
---
 drivers/dma/amd/ae4dma/ae4dma-pci.c     | 1 +
 drivers/dma/amd/ptdma/ptdma-dmaengine.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/dma/amd/ae4dma/ae4dma-pci.c b/drivers/dma/amd/ae4dma/ae4dma-pci.c
index 2c63907db228..8712f4f65e28 100644
--- a/drivers/dma/amd/ae4dma/ae4dma-pci.c
+++ b/drivers/dma/amd/ae4dma/ae4dma-pci.c
@@ -132,6 +132,7 @@ static void ae4_pci_remove(struct pci_dev *pdev)
 {
 	struct ae4_device *ae4 = dev_get_drvdata(&pdev->dev);
 
+	pt_dmaengine_unregister(&ae4->pt);
 	ae4_destroy_work(ae4);
 	ae4_deinit(ae4);
 }
diff --git a/drivers/dma/amd/ptdma/ptdma-dmaengine.c b/drivers/dma/amd/ptdma/ptdma-dmaengine.c
index 628c49ce5de9..22e7b3ae26a1 100644
--- a/drivers/dma/amd/ptdma/ptdma-dmaengine.c
+++ b/drivers/dma/amd/ptdma/ptdma-dmaengine.c
@@ -657,3 +657,4 @@ void pt_dmaengine_unregister(struct pt_device *pt)
 
 	kmem_cache_destroy(pt->dma_desc_cache);
 }
+EXPORT_SYMBOL_GPL(pt_dmaengine_unregister);
-- 
2.56.0.567.gdb80ae8cd5-goog