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.bald...@samsung.com> --- Changelog: v3: - updated the commit message v2: https://lkml.org/lkml/2015/1/14/17 - fixed comment from Paul Zimmerman v1: https://lkml.org/lkml/2015/1/13/186 drivers/usb/dwc2/core_intr.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c index ad43c5b..02e3e2d 100644 --- 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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
