From b77b2637b39ecc380bb08992380d7d48452b0872 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Fri, 1 Feb 2013 15:25:37 -0700 Subject: NTB: Link toggle memory leak Each link-up will allocate a new NTB receive buffer when the NTB properties are negotiated with the remote system. These allocations did not check for existing buffers and thus did not free them. Now, the driver will check for an existing buffer and free it if not of the correct size, before trying to alloc a new one. Signed-off-by: Jon Mason --- drivers/ntb/ntb_transport.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) (limited to 'drivers') diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 79a3203..be416d6 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, -- cgit v1.1