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

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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 =