diff options
| author | Jerry Zhang <zhangjerry@google.com> | 2017-04-19 18:23:38 -0700 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-06-02 11:22:31 +0300 |
| commit | 222155de45573e978cda988b7efc7d4e7b9a8ff9 (patch) | |
| tree | adcb3c45cb941485794fa7be6a40155a3b7e7d7f /include/uapi/linux | |
| parent | 8a8b161df5ce06ef5a315899f83978e765be09e8 (diff) | |
usb: gadget: function: f_fs: Let ffs_epfile_ioctl wait for enable.
This allows users to make an ioctl call as the first action on a
connection. Ex, some functions might want to get endpoint size
before making any i/os.
Previously, calling ioctls before read/write would depending on the
timing of endpoints being enabled.
ESHUTDOWN is now a possible return value and ENODEV is not, so change
docs accordingly.
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Jerry Zhang <zhangjerry@google.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/usb/functionfs.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h index 062606f02309..f913d08ab7bb 100644 --- a/include/uapi/linux/usb/functionfs.h +++ b/include/uapi/linux/usb/functionfs.h @@ -275,13 +275,14 @@ struct usb_functionfs_event { #define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128) /* - * Returns real bEndpointAddress of an endpoint. If function is not - * active returns -ENODEV. + * Returns real bEndpointAddress of an endpoint. If endpoint shuts down + * during the call, returns -ESHUTDOWN. */ #define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129) /* - * Returns endpoint descriptor. If function is not active returns -ENODEV. + * Returns endpoint descriptor. If endpoint shuts down during the call, + * returns -ESHUTDOWN. */ #define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \ struct usb_endpoint_descriptor) |