From: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
The mutex 'spi_bus_mutex' should be used, instead of the spin-lock,
while changing the state of the kernel-thread. Also changing the
usb-gadget state need not be protected by a spin-lock.
This should fix the Smatch static checker warning
warn: sleeping in atomic context
Fixes: 48ba02b2e2b1 ("usb: gadget: add udc driver for max3420")
Signed-off-by: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
---
drivers/usb/gadget/udc/max3420_udc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/udc/max3420_udc.c b/drivers/usb/gadget/udc/max3420_udc.c
index ddf0ed3eb4f2..3666cc44f4e7 100644
--- a/drivers/usb/gadget/udc/max3420_udc.c
+++ b/drivers/usb/gadget/udc/max3420_udc.c
@@ -501,13 +501,16 @@ static irqreturn_t max3420_vbus_handler(int irq, void *dev_id)
unsigned long flags;
spin_lock_irqsave(&udc->lock, flags);
+
/* its a vbus change interrupt */
udc->vbus_active = !udc->vbus_active;
udc->todo |= UDC_START;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
usb_udc_vbus_handler(&udc->gadget, udc->vbus_active);
usb_gadget_set_state(&udc->gadget, udc->vbus_active
? USB_STATE_POWERED : USB_STATE_NOTATTACHED);
- spin_unlock_irqrestore(&udc->lock, flags);
if (udc->thread_task)
wake_up_process(udc->thread_task);
@@ -1298,15 +1301,14 @@ static int max3420_probe(struct spi_device *spi)
static void max3420_remove(struct spi_device *spi)
{
struct max3420_udc *udc = spi_get_drvdata(spi);
- unsigned long flags;
usb_del_gadget_udc(&udc->gadget);
- spin_lock_irqsave(&udc->lock, flags);
+ mutex_lock(&udc->spi_bus_mutex);
kthread_stop(udc->thread_task);
- spin_unlock_irqrestore(&udc->lock, flags);
+ mutex_unlock(&udc->spi_bus_mutex);
}
static const struct of_device_id max3420_udc_of_match[] = {
--
2.34.1
