usb: gadget: at91_udc: move prepare clk into process context

Commit 7628083227b6bc4a7e33d7c381d7a4e558424b6b (usb: gadget: at91_udc:
prepare clk before calling enable) added clock preparation in interrupt
context. This is not allowed as it might sleep. Also setting the clock
rate is unsafe to call from there for the same reason. Move clock
preparation and setting clock rate into process context (at91udc_probe).

Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: <stable@vger.kernel.org> # v3.17+
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c
index fe0534c0e3d4cf4f1854e212dbb4f0ac9a335938..eb2999c5d03c1eb661b40ad52e8d0ae259b9c44a 100644 (file)
--- a/drivers/usb/gadget/udc/at91_udc.c
+++ b/drivers/usb/gadget/udc/at91_udc.c
@@ -895,12 +895,10 @@ static void clk_on(struct at91_udc *udc)
                return;
        udc->clocked = 1;
 
-       if (IS_ENABLED(CONFIG_COMMON_CLK)) {
-               clk_set_rate(udc->uclk, 48000000);
-               clk_prepare_enable(udc->uclk);
-       }
-       clk_prepare_enable(udc->iclk);
-       clk_prepare_enable(udc->fclk);
+       if (IS_ENABLED(CONFIG_COMMON_CLK))
+               clk_enable(udc->uclk);
+       clk_enable(udc->iclk);
+       clk_enable(udc->fclk);
 }
 
 static void clk_off(struct at91_udc *udc)
@@ -909,10 +907,10 @@ static void clk_off(struct at91_udc *udc)
                return;
        udc->clocked = 0;
        udc->gadget.speed = USB_SPEED_UNKNOWN;
-       clk_disable_unprepare(udc->fclk);
-       clk_disable_unprepare(udc->iclk);
+       clk_disable(udc->fclk);
+       clk_disable(udc->iclk);
        if (IS_ENABLED(CONFIG_COMMON_CLK))
-               clk_disable_unprepare(udc->uclk);
+               clk_disable(udc->uclk);
 }
 
 /*
@@ -1793,14 +1791,24 @@ static int at91udc_probe(struct platform_device *pdev)
        }
 
        /* don't do anything until we have both gadget driver and VBUS */
+       if (IS_ENABLED(CONFIG_COMMON_CLK)) {
+               clk_set_rate(udc->uclk, 48000000);
+               retval = clk_prepare(udc->uclk);
+               if (retval)
+                       goto fail1;
+       }
+       retval = clk_prepare(udc->fclk);
+       if (retval)
+               goto fail1a;
+
        retval = clk_prepare_enable(udc->iclk);
        if (retval)
-               goto fail1;
+               goto fail1b;
        at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
        at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
        /* Clear all pending interrupts - UDP may be used by bootloader. */
        at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
-       clk_disable_unprepare(udc->iclk);
+       clk_disable(udc->iclk);
 
        /* request UDC and maybe VBUS irqs */
        udc->udp_irq = platform_get_irq(pdev, 0);
@@ -1808,7 +1816,7 @@ static int at91udc_probe(struct platform_device *pdev)
                        0, driver_name, udc);
        if (retval < 0) {
                DBG("request irq %d failed\n", udc->udp_irq);
-               goto fail1;
+               goto fail1c;
        }
        if (gpio_is_valid(udc->board.vbus_pin)) {
                retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
@@ -1861,6 +1869,13 @@ fail3:
                gpio_free(udc->board.vbus_pin);
 fail2:
        free_irq(udc->udp_irq, udc);
+fail1c:
+       clk_unprepare(udc->iclk);
+fail1b:
+       clk_unprepare(udc->fclk);
+fail1a:
+       if (IS_ENABLED(CONFIG_COMMON_CLK))
+               clk_unprepare(udc->uclk);
 fail1:
        if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk))
                clk_put(udc->uclk);
@@ -1909,6 +1924,11 @@ static int __exit at91udc_remove(struct platform_device *pdev)
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        release_mem_region(res->start, resource_size(res));
 
+       if (IS_ENABLED(CONFIG_COMMON_CLK))
+               clk_unprepare(udc->uclk);
+       clk_unprepare(udc->fclk);
+       clk_unprepare(udc->iclk);
+
        clk_put(udc->iclk);
        clk_put(udc->fclk);
        if (IS_ENABLED(CONFIG_COMMON_CLK))