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| author | Jon Hunter <jonathanh@nvidia.com> | 2016-06-29 17:08:39 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-06-30 08:53:15 +0530 |
| commit | d3183447ef561efe7e734cb4bc331519c276a786 (patch) | |
| tree | 564846266b386037e7cbf50f0ac3b16823cbb3fb /drivers/dma/tegra20-apb-dma.c | |
| parent | 004f614eded1b5746ef610bbe17eba11e4fb5733 (diff) | |
| download | linux-d3183447ef561efe7e734cb4bc331519c276a786.tar.bz2 | |
dmaengine: tegra-apb: Return the actual descriptor status
Commit 71f7e6cc5500 ('dmaengine: tegra20-apb-dma: Only calculate residue
if txstate exists') changed the tegra_dma_tx_status() function to only
calculate the residue if there is a valid 'txstate' pointer for storing
the residue. Although this makes sense, this changed the behaviour of
the function tegra_dma_tx_status() such that if the pointer 'txstate' is
not valid, then we will return whatever state is returned by
dma_cookie_status() and no longer return the state by looking up the DMA
descriptor and returning it's state.
Please note that dma_cookie_status() will either return DMA_COMPLETE or
DMA_IN_PROGRESS. However, if dma_cookie_status() returns DMA_IN_PROGRESS
the actual status could be DMA_ERROR which will only be seen from
checking the descriptor status. Therefore, even if 'txstate' is not
valid, still check to see if there is a valid descriptor for the cookie
in question and if so return the descriptor state. Finally, ensure the
residue is still not calculated if the 'txstate' is not valid.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index a8de08b8cbce..9d70b3aeb782 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -811,7 +811,7 @@ static enum dma_status tegra_dma_tx_status(struct dma_chan *dc, unsigned int residual; ret = dma_cookie_status(dc, cookie, txstate); - if (ret == DMA_COMPLETE || !txstate) + if (ret == DMA_COMPLETE) return ret; spin_lock_irqsave(&tdc->lock, flags); @@ -837,7 +837,7 @@ static enum dma_status tegra_dma_tx_status(struct dma_chan *dc, dma_desc = NULL; found: - if (dma_desc) { + if (dma_desc && txstate) { residual = dma_desc->bytes_requested - (dma_desc->bytes_transferred % dma_desc->bytes_requested); |