On 09/06/2012 02:46 PM, Alexander Shishkin wrote: > Marc Kleine-Budde <m...@pengutronix.de> writes: > >> From: Michael Grzeschik <m.grzesc...@pengutronix.de> >> >> When attaching an imx28 or imx53 in USB gadget mode to a Windows host and >> starting a rndis connection we see this message every 4-10 seconds: >> >> g_ether gadget: high speed config #2: RNDIS >> >> Analysis shows that each time this message is printed, the rndis connection >> is >> re-establish due to a reset because of a stalled endpoint (ep 0, dir 1). The >> endpoint is stalled because the reqeust complete bit on that endpoint is set, >> but in isr_tr_complete_low() the endpoint request list (mEp->qh.queue) is >> empty. >> >> This patch removed this check, because the code doesn't take the following >> situation into account: >> >> The loop over all endpoints in isr_tr_complete_handler() will call ep_nuke() >> on >> both ep0/dir0 and ep/dir1 in the first loop. Pending reqeusts will be flushed >> and completed here. There seems to be a race condition, the request is nuked, >> but the request complete bit will be set, too. The subsequent check (in >> ep0/dir1's loop cycle) for endpoint request list (mEp->qh.queue) empty will >> fail. >> >> Both other mainline chipidea drivers (mv_udc_core.c and fsl_udc_core.c) don't >> have this check. >> >> Signed-off-by: Michael Grzeschik <m.grzesc...@pengutronix.de> >> Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de> > > Makes sense to me, > > Acked-by: Alexander Shishkin <alexander.shish...@linux.intel.com>
Thanks a lot. IMHO this is a candidate for stable. 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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