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Date: Wed, 16 Jul 2014 14:31:30 -0500 From: Preston Fick <pffick@...il.com> To: jhovold@...il.com, gregkh@...uxfoundation.org, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org Cc: preston.fick@...abs.com Subject: [PATCH 1/1] Removing unncessary `usb_reset_device` on startup From: Preston Fick <preston.fick@...abs.com> 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@...abs.com> --- drivers/usb/serial/cp210x.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 762e4a5..6891269 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -855,9 +855,6 @@ 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; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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