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authorWolfgang Grandegger <wg@grandegger.com>2017-09-14 18:37:14 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2017-10-19 13:05:54 +0200
commit97819f943063b622eca44d3644067c190dc75039 (patch)
treeb6da0141e32b12829a7c23601835853bd043fccf /net
parent72d92e865d1560723e1957ee3f393688c49ca5bf (diff)
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can: gs_usb: fix busy loop if no more TX context is available
If sending messages with no cable connected, it quickly happens that there is no more TX context available. Then "gs_can_start_xmit()" returns with "NETDEV_TX_BUSY" and the upper layer does retry immediately keeping the CPU busy. To fix that issue, I moved "atomic_dec(&dev->active_tx_urbs)" from "gs_usb_xmit_callback()" to the TX done handling in "gs_usb_receive_bulk_callback()". Renaming "active_tx_urbs" to "active_tx_contexts" and moving it into "gs_[alloc|free]_tx_context()" would also make sense. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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