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dma: mv_xor: Add a device_control function

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The dmatest module for DMA engines calls

device_control(dtc->chan, DMA_TERMINATE_ALL, 0);

after completing the tests. The documentation in
include/linux/dmaengine.h suggests this function is optional and
dma_async_device_register() also does not BUG_ON() when not passed a
function. However, dmatest is not the only code in the kernel
unconditionally calling device_control. So add an implementation
indicating all operations are not implemented.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Andrew Lunn 2012-11-18 11:44:56 +01:00 committed by Thomas Petazzoni
parent cd09fea446
commit 34c93c8657
1 changed files with 9 additions and 0 deletions
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9
drivers/dma/mv_xor.c
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@ -1070,6 +1070,14 @@ out:
return err;
}
/* This driver does not implement any of the optional DMA operations. */
static int
mv_xor_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
return -ENOSYS;
}
static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
{
struct dma_chan *chan, *_chan;
@ -1130,6 +1138,7 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
dma_dev->device_tx_status = mv_xor_status;
dma_dev->device_issue_pending = mv_xor_issue_pending;
dma_dev->device_control = mv_xor_control;
dma_dev->dev = &pdev->dev;
/* set prep routines based on capability */