diff options
| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2022-06-09 15:42:32 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-10 11:52:52 +0200 |
| commit | 54c4862f29725a0a20b09a10f2fa788a973713ee (patch) | |
| tree | 846524fcdc024ca9ae2e37eb9a1a6cfbbbb1b948 /drivers/usb/mtu3 | |
| parent | 5e1fa6dd4caa7ce26029427647bc2f424784a559 (diff) | |
| download | linux-54c4862f29725a0a20b09a10f2fa788a973713ee.tar.bz2 | |
usb: mtu3: implement udc_async_callbacks of gadget operation
Implement udc_async_callbacks hook function to avoid a race when unnbinding
gadget drivers, refer to:
7dc0c55e9f30 ('USB: UDC core: Add udc_async_callbacks gadget op')
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220609074233.15532-2-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/mtu3')
| -rw-r--r-- | drivers/usb/mtu3/mtu3.h | 1 | ||||
| -rw-r--r-- | drivers/usb/mtu3/mtu3_gadget.c | 19 | ||||
| -rw-r--r-- | drivers/usb/mtu3/mtu3_gadget_ep0.c | 2 |
3 files changed, 18 insertions, 4 deletions
diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h index 022bbdc54e68..8408e1b1a24a 100644 --- a/drivers/usb/mtu3/mtu3.h +++ b/drivers/usb/mtu3/mtu3.h @@ -357,6 +357,7 @@ struct mtu3 { unsigned delayed_status:1; unsigned gen2cp:1; unsigned connected:1; + unsigned async_callbacks:1; u8 address; u8 test_mode_nr; diff --git a/drivers/usb/mtu3/mtu3_gadget.c b/drivers/usb/mtu3/mtu3_gadget.c index d57cea62fe6b..30999b4debb8 100644 --- a/drivers/usb/mtu3/mtu3_gadget.c +++ b/drivers/usb/mtu3/mtu3_gadget.c @@ -592,6 +592,18 @@ mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed) spin_unlock_irqrestore(&mtu->lock, flags); } +static void mtu3_gadget_async_callbacks(struct usb_gadget *g, bool enable) +{ + struct mtu3 *mtu = gadget_to_mtu3(g); + unsigned long flags; + + dev_dbg(mtu->dev, "%s %s\n", __func__, enable ? "en" : "dis"); + + spin_lock_irqsave(&mtu->lock, flags); + mtu->async_callbacks = enable; + spin_unlock_irqrestore(&mtu->lock, flags); +} + static const struct usb_gadget_ops mtu3_gadget_ops = { .get_frame = mtu3_gadget_get_frame, .wakeup = mtu3_gadget_wakeup, @@ -600,6 +612,7 @@ static const struct usb_gadget_ops mtu3_gadget_ops = { .udc_start = mtu3_gadget_start, .udc_stop = mtu3_gadget_stop, .udc_set_speed = mtu3_gadget_set_speed, + .udc_async_callbacks = mtu3_gadget_async_callbacks, }; static void mtu3_state_reset(struct mtu3 *mtu) @@ -697,7 +710,7 @@ void mtu3_gadget_cleanup(struct mtu3 *mtu) void mtu3_gadget_resume(struct mtu3 *mtu) { dev_dbg(mtu->dev, "gadget RESUME\n"); - if (mtu->gadget_driver && mtu->gadget_driver->resume) { + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->resume) { spin_unlock(&mtu->lock); mtu->gadget_driver->resume(&mtu->g); spin_lock(&mtu->lock); @@ -708,7 +721,7 @@ void mtu3_gadget_resume(struct mtu3 *mtu) void mtu3_gadget_suspend(struct mtu3 *mtu) { dev_dbg(mtu->dev, "gadget SUSPEND\n"); - if (mtu->gadget_driver && mtu->gadget_driver->suspend) { + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->suspend) { spin_unlock(&mtu->lock); mtu->gadget_driver->suspend(&mtu->g); spin_lock(&mtu->lock); @@ -719,7 +732,7 @@ void mtu3_gadget_suspend(struct mtu3 *mtu) void mtu3_gadget_disconnect(struct mtu3 *mtu) { dev_dbg(mtu->dev, "gadget DISCONNECT\n"); - if (mtu->gadget_driver && mtu->gadget_driver->disconnect) { + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->disconnect) { spin_unlock(&mtu->lock); mtu->gadget_driver->disconnect(&mtu->g); spin_lock(&mtu->lock); diff --git a/drivers/usb/mtu3/mtu3_gadget_ep0.c b/drivers/usb/mtu3/mtu3_gadget_ep0.c index 0ca47212f1ec..7e7013508af6 100644 --- a/drivers/usb/mtu3/mtu3_gadget_ep0.c +++ b/drivers/usb/mtu3/mtu3_gadget_ep0.c @@ -66,7 +66,7 @@ __acquires(mtu->lock) { int ret; - if (!mtu->gadget_driver) + if (!mtu->gadget_driver || !mtu->async_callbacks) return -EOPNOTSUPP; spin_unlock(&mtu->lock); |