On 01/11/2015 09:45 PM, Ahmed S. Darwish wrote: > From: Ahmed S. Darwish <ahmed.darwish@xxxxxxxxx> > > (This is a draft patch, I'm not sure if this fixes the USB > bug or only its psymptom. Feedback from the linux-usb folks > is really appreciated.) > > When plugging the Kvaser USB/CAN dongle the first time, everything > works as expected and all of the transfers from and to the USB > device succeeds. > > Meanwhile, after unplugging the device and plugging it again, the > first bulk transfer _always_ returns an -ETIMEDOUT. The following > behaviour was observied: > > - Setting higher timeout values for the first bulk transfer never > solved the issue. > > - Unloading, then loading, our kvaser_usb module in question > __always__ solved the issue. > > - Checking first bulk transfer status, and retry the transfer > again in case of an -ETIMEDOUT also __always__ solved the issue. > This is what the patch below does. > > - In the testing done so far, this issue appears only on laptops > but never on PCs (possibly power related?) > > Signed-off-by: Ahmed S. Darwish <ahmed.darwish@xxxxxxxxx> Does this patch apply apply between 3 and 4? If not, please re-arrange the series. As this is a bug fix, patches 1, 2 and 4 will go via net/master, 3 will go via net-next/master. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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