[PATCH v4 2/5] PCI: dwc: Free the page for MSI IRQ in dw_pcie_free_msi()

[Jisheng Zhang]

To avoid memory leak, we need to free the page for MSI in
dw_pcie_free_msi().

Signed-off-by: Jisheng Zhang <jisheng.zh...@synaptics.com>
Acked-by: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 12 ++++++++----
 drivers/pci/controller/dwc/pcie-designware.h      |  1 +
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c 
b/drivers/pci/controller/dwc/pcie-designware-host.c
index 1040939f45b4..a71b874ae3c0 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -305,20 +305,24 @@ void dw_pcie_free_msi(struct pcie_port *pp)
 
        irq_domain_remove(pp->msi_domain);
        irq_domain_remove(pp->irq_domain);
+
+       if (pp->msi_page)
+               __free_page(pp->msi_page);
 }
 
 void dw_pcie_msi_init(struct pcie_port *pp)
 {
        struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
        struct device *dev = pci->dev;
-       struct page *page;
        u64 msi_target;
 
-       page = alloc_page(GFP_KERNEL);
-       pp->msi_data = dma_map_page(dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+       pp->msi_page = alloc_page(GFP_KERNEL);
+       pp->msi_data = dma_map_page(dev, pp->msi_page, 0, PAGE_SIZE,
+                                   DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, pp->msi_data)) {
                dev_err(dev, "Failed to map MSI data\n");
-               __free_page(page);
+               __free_page(pp->msi_page);
+               pp->msi_page = NULL;
                return;
        }
        msi_target = (u64)pp->msi_data;
diff --git a/drivers/pci/controller/dwc/pcie-designware.h 
b/drivers/pci/controller/dwc/pcie-designware.h
index 377f4c0b52da..6fb0a1879932 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -179,6 +179,7 @@ struct pcie_port {
        struct irq_domain       *irq_domain;
        struct irq_domain       *msi_domain;
        dma_addr_t              msi_data;
+       struct page             *msi_page;
        u32                     num_vectors;
        u32                     irq_mask[MAX_MSI_CTRLS];
        raw_spinlock_t          lock;
-- 
2.20.1