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usb: fix usb data race

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Clock ISR would callback into the USB driver before it was initialized
and ready to deal with events. This caused a fault.

Statically initialize the fifo to queue events and process them when the
USB device is initialized to avoid the problem.

Signed-off-by: Tom Burdick <thomas.burdick@gmail.com>
This commit is contained in:
Tom Burdick 2019-01-28 16:22:05 -06:00 • committed by Anas Nashif
commit 08d900df4b
1 changed files with 18 additions and 6 deletions
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24
drivers/usb/device/usb_dc_nrfx.c
View file

@ -266,7 +266,6 @@ struct nrf_usbd_ctx {
bool ready;
struct k_work usb_work;
struct k_fifo work_queue;
struct k_mutex drv_lock;
struct nrf_usbd_ep_ctx ep_ctx[CFG_EP_CNT];
@ -275,7 +274,13 @@ struct nrf_usbd_ctx {
};
static struct nrf_usbd_ctx usbd_ctx;
K_FIFO_DEFINE(work_queue);
static struct nrf_usbd_ctx usbd_ctx = {
.attached = false,
.ready = false,
};
static inline struct nrf_usbd_ctx *get_usbd_ctx(void)
@ -392,7 +397,7 @@ static inline void usbd_evt_free(struct usbd_event *ev)
*/
static inline void usbd_evt_put(struct usbd_event *ev)
{
k_fifo_put(&get_usbd_ctx()->work_queue, ev);
k_fifo_put(&work_queue, ev);
}
/**
@ -400,7 +405,7 @@ static inline void usbd_evt_put(struct usbd_event *ev)
*/
static inline struct usbd_event *usbd_evt_get(void)
{
return k_fifo_get(&get_usbd_ctx()->work_queue, K_NO_WAIT);
return k_fifo_get(&work_queue, K_NO_WAIT);
}
/**
@ -498,8 +503,12 @@ void usb_dc_nrfx_power_event_callback(nrf_power_event_t event)
ev->evt_type = USBD_EVT_POWER;
ev->evt.pwr_evt.state = new_state;
usbd_evt_put(ev);
usbd_work_schedule();
if (usbd_ctx.attached) {
usbd_work_schedule();
}
}
/**
@ -1233,7 +1242,6 @@ int usb_dc_attach(void)
}
k_work_init(&ctx->usb_work, usbd_work_handler);
k_fifo_init(&ctx->work_queue);
k_mutex_init(&ctx->drv_lock);
IRQ_CONNECT(DT_NORDIC_NRF_USBD_USBD_0_IRQ,
@ -1262,6 +1270,10 @@ int usb_dc_attach(void)
ctx->attached = true;
}
if (!k_fifo_is_empty(&work_queue)) {
usbd_work_schedule();
}
return ret;
}