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| author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2024-03-26 12:08:35 +0000 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2024-03-26 12:08:35 +0000 |
| commit | f843bc9bc952bdeb21586ee921d29f5c2ae5a863 (patch) | |
| tree | 05daf639c7add0e0fcb94f65143f10d7d87bd0b5 /include/linux/usb/gadget.h | |
| parent | 3c688a55831db128cc709396992886396d4f1654 (diff) | |
| parent | 3d5a640ecf92e4c8d6e157849217b68984a819bc (diff) | |
Merge branches 'sa1100-for-next' and 'unstable/sa11x0-asoc' into sa1100
Diffstat (limited to 'include/linux/usb/gadget.h')
| -rw-r--r-- | include/linux/usb/gadget.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 75bda0783395..6532beb587b1 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -711,6 +711,15 @@ static inline int usb_gadget_check_config(struct usb_gadget *gadget) * get_interface. Setting a configuration (or interface) is where * endpoints should be activated or (config 0) shut down. * + * The gadget driver's setup() callback does not have to queue a response to + * ep0 within the setup() call, the driver can do it after setup() returns. + * The UDC driver must wait until such a response is queued before proceeding + * with the data/status stages of the control transfer. + * + * NOTE: Currently, a number of UDC drivers rely on USB_GADGET_DELAYED_STATUS + * being returned from the setup() callback, which is a bug. See the comment + * next to USB_GADGET_DELAYED_STATUS for details. + * * (Note that only the default control endpoint is supported. Neither * hosts nor devices generally support control traffic except to ep0.) * |