crypto: ccp - ccp_dmaengine_unregister release dma channels

[ Upstream commit 54cce8ecb9254f971b40a72911c6da403720a2d2 ]

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: 58ea8abf4904 ("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>

diff --git a/drivers/crypto/ccp/ccp-dmaengine.c b/drivers/crypto/ccp/ccp-dmaengine.c
index d718db2..7d4b4ad 100644 (file)
--- a/drivers/crypto/ccp/ccp-dmaengine.c
+++ b/drivers/crypto/ccp/ccp-dmaengine.c
@@ -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;
@@ -736,6 +750,7 @@ 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:
@@ -752,6 +767,7 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp)
                return;
 
        dma_async_device_unregister(dma_dev);
+       ccp_dma_release(ccp);
 
        kmem_cache_destroy(ccp->dma_desc_cache);
        kmem_cache_destroy(ccp->dma_cmd_cache);