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Code Issues Releases Wiki Activity

crypto: ccp - Release dma channels before dmaengine unrgister 

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: 54cce8ecb9 ("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>
This commit is contained in:
Koba Ko 2022-09-01 22:47:12 +08:00 committed by Herbert Xu
parent 24ddd4e1db
commit 68dbe80f5b
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/crypto/ccp/ccp-dmaengine.c
View File

@ -641,6 +641,10 @@ 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);
}
@ -766,8 +770,8 @@ 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);