commit 9aaa81c3366e8393a62374e3a1c67c69edc07b8a upstream.

Chipidea core was calling the interrupt handler from non-IRQ context with interrupts enabled, something which can lead to a deadlock if there's an actual interrupt trying to take a lock that's already held (e.g. the controller lock in udc_irq()).

Add a wrapper that can be used to fake interrupts instead of calling the handler directly.

Fixes: 3ecb3e09b042 ("usb: chipidea: Use extcon framework for VBUS and ID detect") Fixes: 876d4e1e8298 ("usb: chipidea: core: add wakeup support for extcon") Cc: Peter Chen peter.chen@kernel.org Cc: stable@vger.kernel.org # 4.4 Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20211021083447.20078-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [ johan: backport to 4.9; adjust context ] Signed-off-by: Johan Hovold johan@kernel.org ---

This one should apply to 4.4 as well.

Johan

drivers/usb/chipidea/core.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index 6062a5d816a6..f4b13f0637ea 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -516,7 +516,7 @@ int hw_device_reset(struct ci_hdrc *ci) return 0; }

-static irqreturn_t ci_irq(int irq, void *data) +static irqreturn_t ci_irq_handler(int irq, void *data) { struct ci_hdrc *ci = data; irqreturn_t ret = IRQ_NONE; @@ -569,6 +569,15 @@ static irqreturn_t ci_irq(int irq, void *data) return ret; }

+static void ci_irq(struct ci_hdrc *ci) +{ + unsigned long flags; + + local_irq_save(flags); + ci_irq_handler(ci->irq, ci); + local_irq_restore(flags); +} + static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event, void *ptr) { @@ -582,7 +591,7 @@ static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event,

vbus->changed = true;

- ci_irq(ci->irq, ci); + ci_irq(ci); return NOTIFY_DONE; }

@@ -599,7 +608,7 @@ static int ci_id_notifier(struct notifier_block *nb, unsigned long event,

id->changed = true;

- ci_irq(ci->irq, ci); + ci_irq(ci); return NOTIFY_DONE; }

@@ -1011,7 +1020,7 @@ static int ci_hdrc_probe(struct platform_device *pdev) }

platform_set_drvdata(pdev, ci); - ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED, + ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED, ci->platdata->name, ci); if (ret) goto stop; @@ -1126,11 +1135,11 @@ static void ci_extcon_wakeup_int(struct ci_hdrc *ci)

if (!IS_ERR(cable_id->edev) && ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) - ci_irq(ci->irq, ci); + ci_irq(ci);

if (!IS_ERR(cable_vbus->edev) && ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) - ci_irq(ci->irq, ci); + ci_irq(ci); }

static int ci_controller_resume(struct device *dev)