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[1/4] I/OAT: fix channel resources free for not allocated channels 

If the ioatdma driver is loaded but not used it does not allocate descriptors.
Before it frees channel resources it should first be sure
that they have been previously allocated.

Cc: <stable@kernel.org>
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Tested-by: Tom Picard <tom.s.picard@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maciej Sosnowski 2008-11-07 01:45:52 +00:00 committed by David S. Miller
parent fd0fcf5c29
commit c3d4f44f50
1 changed files with 7 additions and 0 deletions
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7
drivers/dma/ioat_dma.c
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@ -807,6 +807,12 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
struct ioat_desc_sw *desc, *_desc;
int in_use_descs = 0;
/* Before freeing channel resources first check
* if they have been previously allocated for this channel.
*/
if (ioat_chan->desccount == 0)
return;
tasklet_disable(&ioat_chan->cleanup_task);
ioat_dma_memcpy_cleanup(ioat_chan);
@ -869,6 +875,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
ioat_chan->last_completion = ioat_chan->completion_addr = 0;
ioat_chan->pending = 0;
ioat_chan->dmacount = 0;
ioat_chan->desccount = 0;
ioat_chan->watchdog_completion = 0;
ioat_chan->last_compl_desc_addr_hw = 0;
ioat_chan->watchdog_tcp_cookie =