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path: root/drivers/ntb/ntb_transport.c
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Diffstat (limited to 'drivers/ntb/ntb_transport.c')
-rw-r--r--drivers/ntb/ntb_transport.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 79a3203eccd..be416d6850f 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -507,17 +507,37 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
qp->tx_pkts = 0;
}
+static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
+{
+ struct ntb_transport_mw *mw = &nt->mw[num_mw];
+ struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
+
+ if (!mw->virt_addr)
+ return;
+
+ dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr);
+ mw->virt_addr = NULL;
+}
+
static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
{
struct ntb_transport_mw *mw = &nt->mw[num_mw];
struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
+ /* No need to re-setup */
+ if (mw->size == ALIGN(size, 4096))
+ return 0;
+
+ if (mw->size != 0)
+ ntb_free_mw(nt, num_mw);
+
/* Alloc memory for receiving data. Must be 4k aligned */
mw->size = ALIGN(size, 4096);
mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr,
GFP_KERNEL);
if (!mw->virt_addr) {
+ mw->size = 0;
dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n",
(int) mw->size);
return -ENOMEM;
@@ -529,18 +549,6 @@ static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
return 0;
}
-static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
-{
- struct ntb_transport_mw *mw = &nt->mw[num_mw];
- struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
-
- if (!mw->virt_addr)
- return;
-
- dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr);
- mw->virt_addr = NULL;
-}
-
static void ntb_qp_link_cleanup(struct work_struct *work)
{
struct ntb_transport_qp *qp = container_of(work,