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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.4
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211021083447.20078-1-johan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[ johan: backport to 4.9; adjust context ]
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
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)
--
2.32.0
