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authorJon Mason <jon.mason@intel.com>2013-11-19 09:34:47 -0700
committerJon Mason <jon.mason@intel.com>2013-11-20 09:57:32 -0700
commit94681194e667c33ba303f1225814197594cbfc34 (patch)
tree2f25a1cd655eef1e64b151e56537e4085d101f77 /drivers/ntb/ntb_transport.c
parentfca4d5188c1123ff63205e35e2c5f551a21d30c4 (diff)
downloadlinux-94681194e667c33ba303f1225814197594cbfc34.tar.bz2
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/ntb/ntb_transport.c')
-rw-r--r--drivers/ntb/ntb_transport.c9
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;