spi: bcm2835: Fix race on DMA termination

If a DMA transfer finishes orderly right when spi_transfer_one_message()
determines that it has timed out, the callbacks bcm2835_spi_dma_done()
and bcm2835_spi_handle_err() race to call dmaengine_terminate_all(),
potentially leading to double termination.

Prevent by atomically changing the dma_pending flag before calling
dmaengine_terminate_all().

Signed-off-by: Lukas Wunner <[email protected]>
Fixes: 3ecd37edaa2a ("spi: bcm2835: enable dma modes for transfers meeting certain conditions")
Cc: [email protected] # v4.2+
Cc: Mathias Duckeck <[email protected]>
Cc: Frank Pavlic <[email protected]>
Cc: Martin Sperl <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

0 files changed, 0 insertions, 0 deletions