@@ -532,7 +532,7 @@ 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;
@@ -585,6 +585,15 @@ 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_cable_notifier(struct notifier_block *nb, unsigned long event,
void *ptr)
{
@@ -594,7 +603,7 @@ static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
cbl->connected = event;
cbl->changed = true;
- ci_irq(ci->irq, ci);
+ ci_irq(ci);
return NOTIFY_DONE;
}
@@ -1048,7 +1057,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
}
}
- 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;
@@ -1170,11 +1179,11 @@ 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)
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 4.19; adjust context ] Signed-off-by: Johan Hovold <johan@kernel.org> --- This one should apply 4.14 as well. Johan drivers/usb/chipidea/core.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)