diff options
| author |   Ahmed S. Darwish <ahmed.darwish@valeo.com> | 2015-01-26 07:24:06 +0200 |
|---|---|---|
| committer |   Marc Kleine-Budde <mkl@pengutronix.de> | 2015-01-27 08:55:09 +0100 |
| commit | 14c10c2a1dd8eb8e00b750b521753260befa2789 (patch) | |
| tree | 9519bad0fd1b08825e52bf264485296bd3913e3b /drivers/net/can/usb/kvaser_usb.c | |
| parent | can: kvaser_usb: Send correct context to URB completion (diff) | |
| download | linux-dev-14c10c2a1dd8eb8e00b750b521753260befa2789.tar.xz linux-dev-14c10c2a1dd8eb8e00b750b521753260befa2789.zip | |
can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT
On some x86 laptops, plugging a Kvaser device again after an
unplug makes the firmware always ignore the very first command.
For such a case, provide some room for retries instead of
completely exiting the driver init code.
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/can/usb/kvaser_usb.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c index f0c62075df0a..55407b9663a6 100644 --- a/drivers/net/can/usb/kvaser_usb.c +++ b/drivers/net/can/usb/kvaser_usb.c @@ -1585,7 +1585,7 @@ static int kvaser_usb_probe(struct usb_interface *intf, { struct kvaser_usb *dev; int err = -ENOMEM; - int i; + int i, retry = 3; dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL); if (!dev) @@ -1603,7 +1603,15 @@ static int kvaser_usb_probe(struct usb_interface *intf, usb_set_intfdata(intf, dev); - err = kvaser_usb_get_software_info(dev); + /* On some x86 laptops, plugging a Kvaser device again after + * an unplug makes the firmware always ignore the very first + * command. For such a case, provide some room for retries + * instead of completely exiting the driver. + */ + do { + err = kvaser_usb_get_software_info(dev); + } while (--retry && err == -ETIMEDOUT); + if (err) { dev_err(&intf->dev, "Cannot get software infos, error %d\n", err); |