On Wed, 28 Aug 2013 18:23:32 -0400 (EDT) David Miller <davem@xxxxxxxxxxxxx> wrote: > From: Rob Gardner <robmatic@xxxxxxxxx> > Date: Sun, 25 Aug 2013 18:29:13 -0600 > > > From 018343ce2e679d97283fb51da25c43aa876d087a Mon Sep 17 00:00:00 2001 > > From: Rob Gardner <robmatic@xxxxxxxxx> > > Date: Sun, 25 Aug 2013 16:02:23 -0600 > > Subject: [PATCH net,stable] net: usb: Add HP hs2434 device to ZLP exception table > > > > This patch adds another entry (HP hs2434 Mobile Broadband) to the list > > of exceptional devices that require a zero length packet in order to > > function properly. This list was added in commit 844e88f0. The hs2434 > > is manufactured by Sierra Wireless, who also produces the MC7710, > > which the ZLP exception list was created for in the first place. So > > hopefully it is just this one producer's devices that will need this > > workaround. > > > > Tested on a DM1-4310NR HP notebook, which does not function without this > > change. > > > > Signed-off-by: Rob Gardner <robmatic@xxxxxxxxx> > > Applied and queued up for -tablt, thanks. > > On the topic of dealing with detection of this issue, how harmful is the > workaround on chips that don't need it? Will the driver not work in that > case? Bjørn says it could have a minor performance impact, but should not cause any loss of functionality. I don't think there's any hard data on what the performance cost might be but I know he would eventually like to get rid of the exception list and live with the possible performance impact if it means functionality for more devices. -- Rob Gardner <robmatic@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
