Messages in this thread Patch in this message | | | From | Jon Mason <> | Subject | [PATCH 5/9] NTB: correct dmaengine_get/put usage | Date | Wed, 20 Nov 2013 17:21:26 -0700 |
| |
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> --- drivers/ntb/ntb_transport.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 7010f23..172501d 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; -- 1.7.9.5
| |