diff options
| author | Ahmed S. Darwish <ahmed.darwish@valeo.com> | 2015-01-26 07:24:06 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-05 22:35:49 -0800 |
| commit | 163113183b105d61446bb6395e14ae156db3ecd5 (patch) | |
| tree | 3620bbe0e620dc27ccf59ec907cecea183a17c53 /drivers | |
| parent | 4a2c136417e2e16fedc8e426cc0a739396bad132 (diff) | |
| download | lwn-163113183b105d61446bb6395e14ae156db3ecd5.tar.gz lwn-163113183b105d61446bb6395e14ae156db3ecd5.zip | |
can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT
commit 14c10c2a1dd8eb8e00b750b521753260befa2789 upstream.
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>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -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 1a20892f155a..f3b8e4742d8b 100644 --- a/drivers/net/can/usb/kvaser_usb.c +++ b/drivers/net/can/usb/kvaser_usb.c @@ -1577,7 +1577,7 @@ 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) @@ -1595,7 +1595,15 @@ 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); |