[PATCH v3 0/9] dmaengine: virt-dma related fixes

[Sascha Hauer <s.hauer@pengutronix.de>]

Several drivers call vchan_dma_desc_free_list() or vchan_vdesc_fini() under
&vc->lock. This is not allowed and the first two patches fix this up. If you
are a DMA driver maintainer, the first two patches are the reason you are on
Cc.

The remaining patches are the original purpose of this series:
The i.MX SDMA driver leaks memory when a currently running descriptor is
aborted. Calling vchan_terminate_vdesc() on it to fix this revealed that
the virt-dma support calls the desc_free with the spin_lock held. This
doesn't work for the SDMA driver because it calls dma_free_coherent in
its desc_free hook. This series aims to fix that up.

Changes since v2:
- change drivers to not call vchan_dma_desc_free_list() under spin_lock
- remove debug message from vchan_dma_desc_free_list()

Changes since v1:
- rebase on v5.5-rc1
- Swap patches 1 and 2 for bisectablity
- Rename desc_aborted to desc_terminated
- Free up terminated descriptors immediately instead of letting them accumulate

Sascha Hauer (9):
  dmaengine: bcm2835: do not call vchan_vdesc_fini() with lock held
  dmaengine: virt-dma: Add missing locking
  dmaengine: virt-dma: remove debug message
  dmaengine: virt-dma: Do not call desc_free() under a spin_lock
  dmaengine: virt-dma: Add missing locking around list operations
  dmaengine: virt-dma: use vchan_vdesc_fini() to free descriptors
  dmaengine: imx-sdma: rename function
  dmaengine: imx-sdma: find desc first in sdma_tx_status
  dmaengine: imx-sdma: Fix memory leak

 drivers/dma/bcm2835-dma.c                     |  5 +--
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    |  8 +---
 drivers/dma/imx-sdma.c                        | 37 +++++++++++--------
 drivers/dma/mediatek/mtk-uart-apdma.c         |  3 +-
 drivers/dma/owl-dma.c                         |  3 +-
 drivers/dma/s3c24xx-dma.c                     | 22 +++++------
 drivers/dma/sf-pdma/sf-pdma.c                 |  4 +-
 drivers/dma/sun4i-dma.c                       |  3 +-
 drivers/dma/virt-dma.c                        | 10 ++---
 drivers/dma/virt-dma.h                        | 27 ++++++++------
 10 files changed, 63 insertions(+), 59 deletions(-)

-- 
2.24.0