usb: gadget: mv_u3d: fix error handling in mv_u3d_probe()

There are several inconsistencies in the error handling code.
1. If clk_get() fails, it goes to clk_put().
2. If pdata->phy_init() fails, it does not disable u3d->clk.
3. In case of failure after stopping u3d, it does pdata->phy_deinit()
   and clk_disable(u3d->clk) twice.
4. It ignores failures in clk_enable().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c
index d365449a295a8ab823f9358146a0a910bcabba2d..772049afe1666404dcdf0ee1310feb344d574f33 100644 (file)
--- a/drivers/usb/gadget/udc/mv_u3d_core.c
+++ b/drivers/usb/gadget/udc/mv_u3d_core.c
@@ -1835,13 +1835,18 @@ static int mv_u3d_probe(struct platform_device *dev)
        }
 
        /* we will access controller register, so enable the u3d controller */
-       clk_enable(u3d->clk);
+       retval = clk_enable(u3d->clk);
+       if (retval) {
+               dev_err(&dev->dev, "clk_enable error %d\n", retval);
+               goto err_u3d_enable;
+       }
 
        if (pdata->phy_init) {
                retval = pdata->phy_init(u3d->phy_regs);
                if (retval) {
                        dev_err(&dev->dev, "init phy error %d\n", retval);
-                       goto err_u3d_enable;
+                       clk_disable(u3d->clk);
+                       goto err_phy_init;
                }
        }
 
@@ -1974,15 +1979,13 @@ err_alloc_trb_pool:
        dma_free_coherent(&dev->dev, u3d->ep_context_size,
                u3d->ep_context, u3d->ep_context_dma);
 err_alloc_ep_context:
-       if (pdata->phy_deinit)
-               pdata->phy_deinit(u3d->phy_regs);
-       clk_disable(u3d->clk);
+err_phy_init:
 err_u3d_enable:
        iounmap(u3d->cap_regs);
 err_map_cap_regs:
 err_get_cap_regs:
-err_get_clk:
        clk_put(u3d->clk);
+err_get_clk:
        kfree(u3d);
 err_alloc_private:
 err_pdata: