[PATCH 2/3 V1] block: Fix not tracing all device plug-operation.

If process handled two or more devices,there will not be trace some devices plug-operation. V0-->V1 Fix a bug when insert a req to plug-list which already had the same request-queue, it should used list_add not list_add_tail. Signed-off-by: Jianpeng Ma Signed-off-by: Jens Axboe ---

[PATCH 2/3 V1] block: Fix not tracing all device plug-operation.

If process handled two or more devices,there will not be trace some devices plug-operation. V0--V1 Fix a bug when insert a req to plug-list which already had the same request-queue, it should used list_add not list_add_tail. Signed-off-by: Jianpeng Ma majianp...@gmail.com Signed-off-by: Jens