USB: omap_udc: fix crashes on probe error and module removal

We currently crash if usb_add_gadget_udc_release() fails, since the
udc->done is not initialized until in the remove function.
Furthermore, on module removal the udc data is accessed although
the release function is already triggered by usb_del_gadget_udc()
early in the function.

Fix by rewriting the release and remove functions, basically moving
all the cleanup into the release function, and doing the completion
only in the module removal case.

The patch fixes omap_udc module probe with a failing gadged, and also
allows the removal of omap_udc. Tested by running "modprobe omap_udc;
modprobe -r omap_udc" in a loop.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/omap_udc.c b/drivers/usb/gadget/udc/omap_udc.c
index 1c77218c82af857ad509617b8eaf4ed628c5981e..240ccba44592223f6663a9450d67b7b84af6cf69 100644 (file)
--- a/drivers/usb/gadget/udc/omap_udc.c
+++ b/drivers/usb/gadget/udc/omap_udc.c
@@ -2593,9 +2593,22 @@ omap_ep_setup(char *name, u8 addr, u8 type,
 
 static void omap_udc_release(struct device *dev)
 {
-       complete(udc->done);
+       pullup_disable(udc);
+       if (!IS_ERR_OR_NULL(udc->transceiver)) {
+               usb_put_phy(udc->transceiver);
+               udc->transceiver = NULL;
+       }
+       omap_writew(0, UDC_SYSCON1);
+       remove_proc_file();
+       if (udc->dc_clk) {
+               if (udc->clk_requested)
+                       omap_udc_enable_clock(0);
+               clk_put(udc->hhc_clk);
+               clk_put(udc->dc_clk);
+       }
+       if (udc->done)
+               complete(udc->done);
        kfree(udc);
-       udc = NULL;
 }
 
 static int
@@ -2900,12 +2913,8 @@ bad_on_1710:
        }
 
        create_proc_file();
-       status = usb_add_gadget_udc_release(&pdev->dev, &udc->gadget,
-                       omap_udc_release);
-       if (!status)
-               return 0;
-
-       remove_proc_file();
+       return usb_add_gadget_udc_release(&pdev->dev, &udc->gadget,
+                                         omap_udc_release);
 
 cleanup1:
        kfree(udc);
@@ -2932,36 +2941,15 @@ static int omap_udc_remove(struct platform_device *pdev)
 {
        DECLARE_COMPLETION_ONSTACK(done);
 
-       if (!udc)
-               return -ENODEV;
-
-       usb_del_gadget_udc(&udc->gadget);
-       if (udc->driver)
-               return -EBUSY;
-
        udc->done = &done;
 
-       pullup_disable(udc);
-       if (!IS_ERR_OR_NULL(udc->transceiver)) {
-               usb_put_phy(udc->transceiver);
-               udc->transceiver = NULL;
-       }
-       omap_writew(0, UDC_SYSCON1);
-
-       remove_proc_file();
+       usb_del_gadget_udc(&udc->gadget);
 
-       if (udc->dc_clk) {
-               if (udc->clk_requested)
-                       omap_udc_enable_clock(0);
-               clk_put(udc->hhc_clk);
-               clk_put(udc->dc_clk);
-       }
+       wait_for_completion(&done);
 
        release_mem_region(pdev->resource[0].start,
                        pdev->resource[0].end - pdev->resource[0].start + 1);
 
-       wait_for_completion(&done);
-
        return 0;
 }