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| author |   David S. Miller <davem@davemloft.net> | 2014-08-27 17:05:53 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-08-27 17:05:53 -0700 |
| commit | c2c0e8b2b88cac379b2a2167b448000dedd2596a (patch) | |
| tree | de123ea72ffe5f4a6cdf160b8a2b7a135c0c516e /drivers/usb/gadget/function/f_ncm.c | |
| parent | ethernet: arc: Add support for specific SoC layer device tree bindings (diff) | |
| download | linux-dev-c2c0e8b2b88cac379b2a2167b448000dedd2596a.tar.xz linux-dev-c2c0e8b2b88cac379b2a2167b448000dedd2596a.zip | |
f_ncm: Don't use netdev_start_xmit().
Unfortunately, the USB gadget layer has this weird things where NULL
skbs are passed into ops->ndo_start_xmit() in order to trigger the
dev->wrap() calls to build packets.
This is completely outside of the allowable range of sane arguments
for the ndo_start_xmit method. All invocations of ndo_start_xmit()
should be with non-NULL SKB arguments.
Put back the direct call, but with a comment explaining how this
is not acceptable in the long term.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/usb/gadget/function/f_ncm.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_ncm.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c index cb5d646db6a7..146f48cc65d7 100644 --- a/drivers/usb/gadget/function/f_ncm.c +++ b/drivers/usb/gadget/function/f_ncm.c @@ -1101,7 +1101,15 @@ static void ncm_tx_tasklet(unsigned long data) /* Only send if data is available. */ if (ncm->skb_tx_data) { ncm->timer_force_tx = true; - netdev_start_xmit(NULL, ncm->netdev); + + /* XXX This allowance of a NULL skb argument to ndo_start_xmit + * XXX is not sane. The gadget layer should be redesigned so + * XXX that the dev->wrap() invocations to build SKBs is transparent + * XXX and performed in some way outside of the ndo_start_xmit + * XXX interface. + */ + ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev); + ncm->timer_force_tx = false; } } |