[PATCH v3 00/12] dmaengine: at_xdmac: Various fixes

Tudor Ambarus
2021-12-15T11:01:23Z

Bugs identified when debugging a hang encountered when operating
an octal DTR SPI NOR memory. The culprit was the flash, not the
DMA driver, so all these bugs are not experienced in real life,
they are all theoretical fixes. Nevertheless the bugs are there
and I think they should be squashed.

Tested the serial with DMA on sama5d2_xplained. Tested QSPI with DMA on
sama7g5ek. All went well.

v3:
- drop tty patches, they were applied by Greg.
- improve all commit descriptions
- split v2's patch 13/13 in two: one removing a level of indentation
and one fixing the race.

v2:
- drop local chan_rx local variable in patch 3/13, focus just on fixes
for now.
- collect Richard's Acked-by tag.
- add details in the cover letter about what tests were performed.

Tudor Ambarus (12):
dmaengine: at_xdmac: Don't start transactions at tx_submit level
dmaengine: at_xdmac: Start transfer for cyclic channels in
issue_pending
dmaengine: at_xdmac: Print debug message after realeasing the lock
dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie
dmaengine: at_xdmac: Fix race for the tx desc callback
dmaengine: at_xdmac: Move the free desc to the tail of the desc list
dmaengine: at_xdmac: Fix concurrency over xfers_list
dmaengine: at_xdmac: Remove a level of indentation in
at_xdmac_advance_work()
dmaengine: at_xdmac: Fix lld view setting
dmaengine: at_xdmac: Fix at_xdmac_lld struct definition
dmaengine: at_xdmac: Remove a level of indentation in
at_xdmac_tasklet()
dmaengine: at_xdmac: Fix race over irq_status

drivers/dma/at_xdmac.c | 186 ++++++++++++++++++++---------------------
1 file changed, 89 insertions(+), 97 deletions(-)

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2.25.1