usb: dwc2: call dwc2_is_controller_alive() under spinlock

This patch fixes the following problem: data transmission in direction
IN break unless the GSNPSID register access is done with spinlock held.
This issue occurs at least in Exynos4412 SoC, probably in many SoC's
from Exynos familly.

The problem is described here:
https://lkml.org/lkml/2014/12/22/185
And there is linux mailing list discussion:
https://lkml.org/lkml/2015/1/14/17

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
index ad43c5bc1ef19eadfc074f42690183fcbcf37cef..02e3e2d4ea5658c0ddd6de8b1cb1729425a3c0ab 100644 (file)
--- a/drivers/usb/dwc2/core_intr.c
+++ b/drivers/usb/dwc2/core_intr.c
@@ -476,13 +476,13 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
        u32 gintsts;
        irqreturn_t retval = IRQ_NONE;
 
+       spin_lock(&hsotg->lock);
+
        if (!dwc2_is_controller_alive(hsotg)) {
                dev_warn(hsotg->dev, "Controller is dead\n");
                goto out;
        }
 
-       spin_lock(&hsotg->lock);
-
        gintsts = dwc2_read_common_intr(hsotg);
        if (gintsts & ~GINTSTS_PRTINT)
                retval = IRQ_HANDLED;
@@ -515,8 +515,8 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
                }
        }
 
-       spin_unlock(&hsotg->lock);
 out:
+       spin_unlock(&hsotg->lock);
        return retval;
 }
 EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);