usb: musb: ux500_dma: add missing MEM resource check

Fix dma_controller_create() fail path in case memory resource is
missing.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index c3a584c..2df9b7d 100644 (file)
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -374,12 +374,17 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *ba
 
        controller = kzalloc(sizeof(*controller), GFP_KERNEL);
        if (!controller)
-               return NULL;
+               goto kzalloc_fail;
 
        controller->private_data = musb;
 
        /* Save physical address for DMA controller. */
        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!iomem) {
+               dev_err(musb->controller, "no memory resource defined\n");
+               goto plat_get_fail;
+       }
+
        controller->phy_base = (dma_addr_t) iomem->start;
 
        controller->controller.start = ux500_dma_controller_start;
@@ -391,4 +396,9 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *ba
        controller->controller.is_compatible = ux500_dma_is_compatible;
 
        return &controller->controller;
+
+plat_get_fail:
+       kfree(controller);
+kzalloc_fail:
+       return NULL;
 }