[RFC PATCH 04/12] usb: xhci: move reserving command ring trb

[Niklas Neronin <niklas.neronin@linux.intel.com>]

Move the command ring TRB reservation from xhci_mem_init() to xhci_init().

Function xhci_mem_init() is intended for memory allocation,
while xhci_init() is for initialization.

This split allows xhci_init() to be reused when resuming from S4
suspend-to-disk.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
---
 drivers/usb/host/xhci-mem.c | 7 -------
 drivers/usb/host/xhci.c     | 6 ++++++
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c708bdd69f16..2e6c5fe11940 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2477,13 +2477,6 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "First segment DMA is 0x%pad",
 		       &xhci->cmd_ring->first_seg->dma);
 
-	/*
-	 * Reserve one command ring TRB for disabling LPM.
-	 * Since the USB core grabs the shared usb_bus bandwidth mutex before
-	 * disabling LPM, we only need to reserve one TRB for all devices.
-	 */
-	xhci->cmd_ring_reserved_trbs++;
-
 	/* Allocate and set up primary interrupter 0 with an event ring. */
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Allocating primary event ring");
 	xhci->interrupters = kcalloc_node(xhci->max_interrupters, sizeof(*xhci->interrupters),
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index ad095768ed48..e8366aa479ab 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -564,6 +564,12 @@ static int xhci_init(struct usb_hcd *hcd)
 	/* Set the Number of Device Slots Enabled to the maximum supported value */
 	xhci_enable_max_dev_slots(xhci);
 
+	/*
+	 * Reserve one command ring TRB for disabling LPM.
+	 * Since the USB core grabs the shared usb_bus bandwidth mutex before
+	 * disabling LPM, we only need to reserve one TRB for all devices.
+	 */
+	xhci->cmd_ring_reserved_trbs = 1;
 	/* Set the address in the Command Ring Control register */
 	xhci_set_cmd_ring_deq(xhci);
 
-- 
2.50.1