The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 9aaa81c3366e8393a62374e3a1c67c69edc07b8a Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Thu, 21 Oct 2021 10:34:47 +0200 Subject: [PATCH] USB: chipidea: fix interrupt deadlock
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
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index 2b18f5088ae4..a56f06368d14 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -514,7 +514,7 @@ 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; @@ -567,6 +567,15 @@ 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) { @@ -576,7 +585,7 @@ 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; }
@@ -617,7 +626,7 @@ static int ci_usb_role_switch_set(struct usb_role_switch *sw, if (cable) { cable->changed = true; cable->connected = false; - ci_irq(ci->irq, ci); + ci_irq(ci); spin_unlock_irqrestore(&ci->lock, flags); if (ci->wq && role != USB_ROLE_NONE) flush_workqueue(ci->wq); @@ -635,7 +644,7 @@ static int ci_usb_role_switch_set(struct usb_role_switch *sw, if (cable) { cable->changed = true; cable->connected = true; - ci_irq(ci->irq, ci); + ci_irq(ci); } spin_unlock_irqrestore(&ci->lock, flags); pm_runtime_put_sync(ci->dev); @@ -1174,7 +1183,7 @@ 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; @@ -1295,11 +1304,11 @@ 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)