[PATCH 3.18 086/150] usb: gadget: at91_udc: move prepare clk into process context

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ronald Wahl <ronald.wahl@xxxxxxxxxxx>

commit b2ba27a5c56ff7204d8a8684893d64d4afe2cee5 upstream.

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@xxxxxxxxxxx>
Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Cc: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/gadget/udc/at91_udc.c |   44 +++++++++++++++++++++++++++-----------
 1 file changed, 32 insertions(+), 12 deletions(-)

--- a/drivers/usb/gadget/udc/at91_udc.c
+++ b/drivers/usb/gadget/udc/at91_udc.c
@@ -870,12 +870,10 @@ 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)
@@ -884,10 +882,10 @@ 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);
 }
 
 /*
@@ -1780,14 +1778,24 @@ static int at91udc_probe(struct platform
 	}
 
 	/* 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);
@@ -1795,7 +1803,7 @@ static int at91udc_probe(struct platform
 			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");
@@ -1848,6 +1856,13 @@ 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);
@@ -1896,6 +1911,11 @@ static int __exit at91udc_remove(struct
 	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))


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/