Commit Message
Greg KH
Oct. 24, 2022, 11:31 a.m. UTC
From: Koba Ko <koba.ko@canonical.com> [ Upstream commit 68dbe80f5b510c66c800b9e8055235c5b07e37d1 ] A warning is shown during shutdown, __dma_async_device_channel_unregister called while 2 clients hold a reference WARNING: CPU: 15 PID: 1 at drivers/dma/dmaengine.c:1110 __dma_async_device_channel_unregister+0xb7/0xc0 Call dma_release_channel for occupied channles before dma_async_device_unregister. Fixes: 54cce8ecb925 ("crypto: ccp - ccp_dmaengine_unregister release dma channels") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Koba Ko <koba.ko@canonical.com> Acked-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/crypto/ccp/ccp-dmaengine.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/ccp-dmaengine.c b/drivers/crypto/ccp/ccp-dmaengine.c index b3eea329f840..b9299defb431 100644 --- a/drivers/crypto/ccp/ccp-dmaengine.c +++ b/drivers/crypto/ccp/ccp-dmaengine.c @@ -642,6 +642,10 @@ static void ccp_dma_release(struct ccp_device *ccp) for (i = 0; i < ccp->cmd_q_count; i++) { chan = ccp->ccp_dma_chan + i; dma_chan = &chan->dma_chan; + + if (dma_chan->client_count) + dma_release_channel(dma_chan); + tasklet_kill(&chan->cleanup_tasklet); list_del_rcu(&dma_chan->device_node); } @@ -767,8 +771,8 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp) if (!dmaengine) return; - dma_async_device_unregister(dma_dev); ccp_dma_release(ccp); + dma_async_device_unregister(dma_dev); kmem_cache_destroy(ccp->dma_desc_cache); kmem_cache_destroy(ccp->dma_cmd_cache);