Assign buffer ownership to SDMA after invoking descriptor callback to make sure that SDMA does not write to the buffer before it is read by the CPU. Signed-off-by: Tomasz Moń <tomasz.mon@xxxxxxxxxxxxxxx> --- drivers/dma/imx-sdma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 330ff41cd614..8cc5103193c3 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -847,7 +847,6 @@ static void sdma_update_channel_loop(struct sdma_channel *sdmac) */ desc->chn_real_count = bd->mode.count; - bd->mode.status |= BD_DONE; bd->mode.count = desc->period_len; desc->buf_ptail = desc->buf_tail; desc->buf_tail = (desc->buf_tail + 1) % desc->num_bd; @@ -862,6 +861,9 @@ static void sdma_update_channel_loop(struct sdma_channel *sdmac) dmaengine_desc_get_callback_invoke(&desc->vd.tx, NULL); spin_lock(&sdmac->vc.lock); + /* Assign buffer ownership to SDMA */ + bd->mode.status |= BD_DONE; + if (error) sdmac->status = old_status; } -- 2.25.1
