[PATCH 4.9 02/69] tcmu: Fix possible overwrite of t_data_sgs last iov[]

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Xiubo Li commit ab22d2604c86ceb01bb2725c9860b88a7dd383bb upstream. If there has BIDI data, its first iov[] will overwrite the last iov[] for se_cmd->t_data_sg.

[PATCH 4.9 02/69] tcmu: Fix possible overwrite of t_data_sgs last iov[]

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Xiubo Li commit ab22d2604c86ceb01bb2725c9860b88a7dd383bb upstream. If there has BIDI data, its first iov[] will overwrite the last iov[] for se_cmd->t_data_sg. To fix this, we can just