[stable,5/6] usb: dwc2/gadget: delay enabling irq once hardware is configured properly

Message ID 1410169532-16212-6-git-send-email-r.baldyga@samsung.com
State Superseded
Headers show

Commit Message

Robert Baldyga Sept. 8, 2014, 9:45 a.m.
From: Marek Szyprowski <m.szyprowski@samsung.com>

This patch fixes kernel panic/interrupt storm/etc issues if bootloader
left s3c-hsotg module in enabled state. Now interrupt handler is enabled
only after proper configuration of hardware registers.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---
 drivers/usb/dwc2/gadget.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

Patch

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 1c2b8dd..2d48ffb 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3444,13 +3444,6 @@  static int s3c_hsotg_probe(struct platform_device *pdev)
 
 	hsotg->irq = ret;
 
-	ret = devm_request_irq(&pdev->dev, hsotg->irq, s3c_hsotg_irq, 0,
-				dev_name(dev), hsotg);
-	if (ret < 0) {
-		dev_err(dev, "cannot claim IRQ\n");
-		goto err_clk;
-	}
-
 	dev_info(dev, "regs %p, irq %d\n", hsotg->regs, hsotg->irq);
 
 	hsotg->gadget.max_speed = USB_SPEED_HIGH;
@@ -3498,6 +3491,17 @@  static int s3c_hsotg_probe(struct platform_device *pdev)
 	s3c_hsotg_init(hsotg);
 	s3c_hsotg_hw_cfg(hsotg);
 
+	ret = devm_request_irq(&pdev->dev, hsotg->irq, s3c_hsotg_irq, 0,
+				dev_name(dev), hsotg);
+	if (ret < 0) {
+		s3c_hsotg_phy_disable(hsotg);
+		clk_disable_unprepare(hsotg->clk);
+		regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
+				       hsotg->supplies);
+		dev_err(dev, "cannot claim IRQ\n");
+		goto err_clk;
+	}
+
 	/* hsotg->num_of_eps holds number of EPs other than ep0 */
 
 	if (hsotg->num_of_eps == 0) {