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authorPreston Fick <preston.fick@silabs.com>2014-07-16 14:31:30 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-17 17:12:13 -0700
commit934ef5aca9daea10507eebcbd0fb8f6d57d55359 (patch)
treef19645db897fb4ecf8614d867fd840cc090ac392 /drivers/usb/serial/cp210x.c
parentce21bfe603b3401c258c415456c915634998e133 (diff)
downloadlinux-stericsson-934ef5aca9daea10507eebcbd0fb8f6d57d55359.tar.gz
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/serial/cp210x.c')
-rw-r--r--drivers/usb/serial/cp210x.c3
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;