tree 0af448ed77cda24d7c3dbbe80e4c4b2d4d7e0831
parent c760b3725e52403dc1b28644fb09c47a83cacea6
author Fedor Pchelkin <pchelkin@ispras.ru> 1714823221 +0300
committer Christoph Hellwig <hch@lst.de> 1716469607 +0200

dma-mapping: benchmark: fix up kthread-related error handling

kthread creation failure is invalidly handled inside do_map_benchmark().
The put_task_struct() calls on the error path are supposed to balance the
get_task_struct() calls which only happen after all the kthreads are
successfully created. Rollback using kthread_stop() for already created
kthreads in case of such failure.

In normal situation call kthread_stop_put() to gracefully stop kthreads
and put their task refcounts. This should be done for all started
kthreads.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 65789daa8087 ("dma-mapping: add benchmark support for streaming DMA APIs")
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>