[PATCH 4.4 55/66] PCI: shpchp: Enable bridge bus mastering if MSI is enabled

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Aleksandr Bezzubikov commit 48b79a14505349a29b3e20f03619ada9b33c4b17 upstream. An SHPC may generate MSIs to notify software about slot or controller events (SHPC spec r1.0,

[PATCH 4.4 55/66] PCI: shpchp: Enable bridge bus mastering if MSI is enabled

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Aleksandr Bezzubikov commit 48b79a14505349a29b3e20f03619ada9b33c4b17 upstream. An SHPC may generate MSIs to notify software about slot or controller events (SHPC spec r1.0, sec 4.7). A PCI