diff options
| author |   Preston Fick <preston.fick@silabs.com> | 2014-07-16 14:31:30 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-17 17:12:13 -0700 |
| commit | 934ef5aca9daea10507eebcbd0fb8f6d57d55359 (patch) | |
| tree | f19645db897fb4ecf8614d867fd840cc090ac392 /drivers/usb | |
| parent | USB: Add LVS Test device driver (diff) | |
| download | linux-dev-934ef5aca9daea10507eebcbd0fb8f6d57d55359.tar.xz linux-dev-934ef5aca9daea10507eebcbd0fb8f6d57d55359.zip | |
USB: serial: cp210x: Removing unncessary `usb_reset_device` on startup
This `usb_reset_device` command has been around since the driver was
originally reverse engineered. It doesn't cause much issue on single
interface CP210x devices, but on the CP2105 and CP2108 with 2 and 4
interfaces respectively it will cause instability on enumeration and
delays enumeration noticably. There should be no reason to reset a device
at startup, per the CP210x AN571 spec.
Signed-off-by: Preston Fick <preston.fick@silabs.com>
Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/cp210x.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 330df5ce435b..e4bb62225cb9 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -856,9 +856,6 @@ static int cp210x_startup(struct usb_serial *serial) struct usb_host_interface *cur_altsetting; struct cp210x_serial_private *spriv; - /* cp210x buffers behave strangely unless device is reset */ - usb_reset_device(serial->dev); - spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); if (!spriv) return -ENOMEM; |