gianfar: fix potential sk_wmem_alloc imbalance
gianfar: fix potential sk_wmem_alloc imbalance

commit db83d136d7f753 (gianfar: Fix missing sock reference when
processing TX time stamps) added a potential sk_wmem_alloc imbalance

If the new skb has a different truesize than old one, we can get a
negative sk_wmem_alloc once new skb is orphaned at TX completion.

Now we no longer early orphan skbs in dev_hard_start_xmit(), this
probably can lead to fatal bugs.

Signed-off-by: Eric Dumazet <312c7d941f03386814be517ffdb3e0eb6624e275@google.com>
Tested-by: Paul Gortmaker <ae947f3c8df96e1dc851c5e3e5a930ce6d3f1f74@windriver.com>
Cc: Manfred Rudigier <347c4fef16e0936f1a66cd364dba04ad72459d96@omicron.at>
Cc: Claudiu Manoil <93199f51fb74af07aaea9f00c34bceab8fd209ab@freescale.com>
Cc: Jiajun Wu <effa0bba7e1a9b9e0a115436e538c7c794c29af4@freescale.com>
Cc: Andy Fleming <761b620017597639866580fd234cedf470f42bc1@freescale.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs