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dmaengine: ioatdma: adding shutdown support

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The ioatdma needs to be queisced and block all additional op submission
during reboots. When NET_DMA was used, this caused issue as ops were still
being sent to ioatdma during reboots even though PCI BME has been turned
off. Even though NET_DMA has been deprecated, we need to prevent similar
situations. The shutdown handler should address that.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Dave Jiang
2015-08-26 13:17:24 -07:00
committed by Vinod Koul
parent 6ff33f3902
commit ad4a7b5065
4 changed files with 66 additions and 3 deletions
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3
drivers/dma/ioat/dma.c
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@@ -197,7 +197,8 @@ static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
{
spin_lock_bh(&ioat_chan->prep_lock);
__ioat_start_null_desc(ioat_chan);
if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
__ioat_start_null_desc(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}