usb: gadget: function: u_ether: don't starve tx request queue
authorFelipe Balbi <felipe.balbi@linux.intel.com>
Tue, 4 Oct 2016 12:14:43 +0000 (15:14 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 10 Nov 2016 15:36:33 +0000 (16:36 +0100)
commit660c04e8f1742e50237c1f12dab6b66212fa168a
tree5525679860ef579afdd51c64d3523da9e5500614
parentc0510383011fdc471c9fe501bb2462913e5c9308
usb: gadget: function: u_ether: don't starve tx request queue

commit 6c83f77278f17a7679001027e9231291c20f0d8a upstream.

If we don't guarantee that we will always get an
interrupt at least when we're queueing our very last
request, we could fall into situation where we queue
every request with 'no_interrupt' set. This will
cause the link to get stuck.

The behavior above has been triggered with g_ether
and dwc3.

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/gadget/function/u_ether.c