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crypto: ccp - ccp_dmaengine_unregister release dma channels 

[ Upstream commit 54cce8ecb9 ]

ccp_dmaengine_register adds dma_chan->device_node to dma_dev->channels list
but ccp_dmaengine_unregister didn't remove them.
That can cause crashes in various dmaengine methods that tries to use dma_dev->channels

Fixes: 58ea8abf49 ("crypto: ccp - Register the CCP as a DMA...")
Signed-off-by: Dāvis Mosāns <davispuh@gmail.com>
Acked-by: John Allen <john.allen@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dāvis Mosāns 2022-02-28 05:15:45 +02:00 committed by Greg Kroah-Hartman
parent 12fdc58db4
commit 6233be14d4
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/crypto/ccp/ccp-dmaengine.c
View File

@ -632,6 +632,20 @@ static int ccp_terminate_all(struct dma_chan *dma_chan)
return 0;
}
static void ccp_dma_release(struct ccp_device *ccp)
{
struct ccp_dma_chan *chan;
struct dma_chan *dma_chan;
unsigned int i;
for (i = 0; i < ccp->cmd_q_count; i++) {
chan = ccp->ccp_dma_chan + i;
dma_chan = &chan->dma_chan;
tasklet_kill(&chan->cleanup_tasklet);
list_del_rcu(&dma_chan->device_node);
}
}
int ccp_dmaengine_register(struct ccp_device *ccp)
{
struct ccp_dma_chan *chan;
@ -733,6 +747,7 @@ int ccp_dmaengine_register(struct ccp_device *ccp)
return 0;
err_reg:
ccp_dma_release(ccp);
kmem_cache_destroy(ccp->dma_desc_cache);
err_cache:
@ -746,6 +761,7 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp)
struct dma_device *dma_dev = &ccp->dma_dev;
dma_async_device_unregister(dma_dev);
ccp_dma_release(ccp);
kmem_cache_destroy(ccp->dma_desc_cache);
kmem_cache_destroy(ccp->dma_cmd_cache);