From: Olivier Sobrie <olivier@sobrie.be>
Date: Thu, 10 Apr 2014 19:44:21 +0000 (+0200)
Subject: can: kvaser_usb: add retries/timeout to kvaser_usb_wait_msg()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~320^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e59e36e7333702d1d835113ced85243bb7f30f99;p=pandora-kernel.git

can: kvaser_usb: add retries/timeout to kvaser_usb_wait_msg()

On some Kvaser hardware, the firmware returns extra messages after the
request for card info. For instance on a Leaf Light v2:
  --> CMD_GET_CARD_INFO
  <-- CMD_USB_THROTTLE
  <-- CMD_GET_CARD_INFO2
  <-- CMD_GET_CARD_INFO_REQ
When it happens, the probing function fails because we only read
the first usb message.

To overcome this issue, we add a mechanism of retries to the
kvaser_usb_wait_msg() function.

I tested this patch with the following hardware:
 - Kvaser Leaf Light
 - Kvaser Leaf Light v2
 - Kvaser USBCan R

This patch is necessary for the Leaf Light v2 hardware.

Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---

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