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authorDavid S. Miller <davem@davemloft.net>2014-08-28 02:05:53 +0200
committerDavid S. Miller <davem@davemloft.net>2014-08-28 02:05:53 +0200
commitc2c0e8b2b88cac379b2a2167b448000dedd2596a (patch)
treede123ea72ffe5f4a6cdf160b8a2b7a135c0c516e /drivers/usb
parentethernet: arc: Add support for specific SoC layer device tree bindings (diff)
downloadlinux-c2c0e8b2b88cac379b2a2167b448000dedd2596a.tar.xz
linux-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')
-rw-r--r--drivers/usb/gadget/function/f_ncm.c10
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;
}
}