[PATCH v5 15/15] dmaengine: dw-edma: Add pcim_iomap_table return check

[Gustavo Pimentel]

Detected by CoverityScan CID 16555 ("Dereference null return")

Signed-off-by: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
---
 drivers/dma/dw-edma/dw-edma-pcie.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c 
b/drivers/dma/dw-edma/dw-edma-pcie.c
index 686b4ff..7445033 100644
--- a/drivers/dma/dw-edma/dw-edma-pcie.c
+++ b/drivers/dma/dw-edma/dw-edma-pcie.c
@@ -238,6 +238,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
        dw->rd_ch_cnt = vsec_data.rd_ch_cnt;
 
        dw->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg.bar];
+       if (!dw->rg_region.vaddr)
+               return -ENOMEM;
+
        dw->rg_region.vaddr += vsec_data.rg.off;
        dw->rg_region.paddr = pdev->resource[vsec_data.rg.bar].start;
        dw->rg_region.paddr += vsec_data.rg.off;
@@ -250,12 +253,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
                struct dw_edma_block *dt_block = &vsec_data.dt_wr[i];
 
                ll_region->vaddr = pcim_iomap_table(pdev)[ll_block->bar];
+               if (!ll_region->vaddr)
+                       return -ENOMEM;
+
                ll_region->vaddr += ll_block->off;
                ll_region->paddr = pdev->resource[ll_block->bar].start;
                ll_region->paddr += ll_block->off;
                ll_region->sz = ll_block->sz;
 
                dt_region->vaddr = pcim_iomap_table(pdev)[dt_block->bar];
+               if (!dt_region->vaddr)
+                       return -ENOMEM;
+
                dt_region->vaddr += dt_block->off;
                dt_region->paddr = pdev->resource[dt_block->bar].start;
                dt_region->paddr += dt_block->off;
@@ -269,12 +278,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
                struct dw_edma_block *dt_block = &vsec_data.dt_rd[i];
 
                ll_region->vaddr = pcim_iomap_table(pdev)[ll_block->bar];
+               if (!ll_region->vaddr)
+                       return -ENOMEM;
+
                ll_region->vaddr += ll_block->off;
                ll_region->paddr = pdev->resource[ll_block->bar].start;
                ll_region->paddr += ll_block->off;
                ll_region->sz = ll_block->sz;
 
                dt_region->vaddr = pcim_iomap_table(pdev)[dt_block->bar];
+               if (!dt_region->vaddr)
+                       return -ENOMEM;
+
                dt_region->vaddr += dt_block->off;
                dt_region->paddr = pdev->resource[dt_block->bar].start;
                dt_region->paddr += dt_block->off;
-- 
2.7.4