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Date:   Fri, 14 Feb 2020 10:57:54 -0500
From:   Sasha Levin <>
Cc:     Logan Gunthorpe <>,
        Vinod Koul <>, Sasha Levin <>,
Subject: [PATCH AUTOSEL 5.4 224/459] dmaengine: Store module owner in dma_device struct

From: Logan Gunthorpe <>

[ Upstream commit dae7a589c18a4d979d5f14b09374e871b995ceb1 ]

dma_chan_to_owner() dereferences the driver from the struct device to
obtain the owner and call module_[get|put](). However, if the backing
device is unbound before the dma_device is unregistered, the driver
will be cleared and this will cause a NULL pointer dereference.

Instead, store a pointer to the owner module in the dma_device struct
so the module reference can be properly put when the channel is put, even
if the backing device was destroyed first.

This change helps to support a safer unbind of DMA engines.
If the dma_device is unregistered in the driver's remove function,
there's no guarantee that there are no existing clients and a users
action may trigger the WARN_ONCE in dma_async_device_unregister()
which is unlikely to leave the system in a consistent state.
Instead, a better approach is to allow the backing driver to go away
and fail any subsequent requests to it.

Signed-off-by: Logan Gunthorpe <>
Signed-off-by: Vinod Koul <>
Signed-off-by: Sasha Levin <>
 drivers/dma/dmaengine.c   | 4 +++-
 include/linux/dmaengine.h | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 03ac4b96117cd..4b604086b1b3a 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -179,7 +179,7 @@ __dma_device_satisfies_mask(struct dma_device *device,
 static struct module *dma_chan_to_owner(struct dma_chan *chan)
-	return chan->device->dev->driver->owner;
+	return chan->device->owner;
@@ -919,6 +919,8 @@ int dma_async_device_register(struct dma_device *device)
 		return -EIO;
+	device->owner = device->dev->driver->owner;
 	if (dma_has_cap(DMA_MEMCPY, device->cap_mask) && !device->device_prep_dma_memcpy) {
 			"Device claims capability %s, but op is not defined\n",
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index dad4a68fa0094..8013562751a50 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -674,6 +674,7 @@ struct dma_filter {
  * @fill_align: alignment shift for memset operations
  * @dev_id: unique device ID
  * @dev: struct device reference for dma mapping api
+ * @owner: owner module (automatically set based on the provided dev)
  * @src_addr_widths: bit mask of src addr widths the device supports
  *	Width is specified in bytes, e.g. for a device supporting
  *	a width of 4 the mask should have BIT(4) set.
@@ -737,6 +738,7 @@ struct dma_device {
 	int dev_id;
 	struct device *dev;
+	struct module *owner;
 	u32 src_addr_widths;
 	u32 dst_addr_widths;

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