diff options
| author | Jon Mason <jon.mason@intel.com> | 2013-11-19 17:34:47 +0100 |
|---|---|---|
| committer | Jon Mason <jon.mason@intel.com> | 2013-11-20 17:57:32 +0100 |
| commit | 94681194e667c33ba303f1225814197594cbfc34 (patch) | |
| tree | 2f25a1cd655eef1e64b151e56537e4085d101f77 /drivers | |
| parent | NTB: Fix ntb_transport link down race (diff) | |
| download | linux-94681194e667c33ba303f1225814197594cbfc34.tar.xz linux-94681194e667c33ba303f1225814197594cbfc34.zip | |
NTB: correct dmaengine_get/put usage
dmaengine_get() causes the initialization of the per-cpu channel tables.
It needs to be called prior to dma_find_channel().
Initial version by Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jon Mason <jon.mason@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ntb/ntb_transport.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 7010f23dab18..172501d47600 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -1419,11 +1419,12 @@ ntb_transport_create_queue(void *data, struct pci_dev *pdev, qp->tx_handler = handlers->tx_handler; qp->event_handler = handlers->event_handler; + dmaengine_get(); qp->dma_chan = dma_find_channel(DMA_MEMCPY); - if (!qp->dma_chan) + if (!qp->dma_chan) { + dmaengine_put(); dev_info(&pdev->dev, "Unable to allocate DMA channel, using CPU instead\n"); - else - dmaengine_get(); + } for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC); @@ -1464,6 +1465,8 @@ err2: err1: while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) kfree(entry); + if (qp->dma_chan) + dmaengine_put(); set_bit(free_queue, &nt->qp_bitmap); err: return NULL; |