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xHCI: factor out segments allocation and free function

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Factor out the segments allocation and free part from ring allocation
and free routines since driver may call them directly when try to expand
a ring.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Paul Zimmerman <Paul.Zimmerman@synopsys.com>
This commit is contained in:
Andiry Xu 2012-03-05 17:49:35 +08:00 committed by Sarah Sharp
parent b008df60c6
commit 70d4360177
1 changed files with 55 additions and 34 deletions
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89
drivers/usb/host/xhci-mem.c
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@ -65,6 +65,20 @@ static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
kfree(seg);
}
static void xhci_free_segments_for_ring(struct xhci_hcd *xhci,
struct xhci_segment *first)
{
struct xhci_segment *seg;
seg = first->next;
while (seg != first) {
struct xhci_segment *next = seg->next;
xhci_segment_free(xhci, seg);
seg = next;
}
xhci_segment_free(xhci, first);
}
/*
* Make the prev segment point to the next segment.
*
@ -101,22 +115,12 @@ static void xhci_link_segments(struct xhci_hcd *xhci, struct xhci_segment *prev,
/* XXX: Do we need the hcd structure in all these functions? */
void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
{
struct xhci_segment *seg;
struct xhci_segment *first_seg;
if (!ring)
return;
if (ring->first_seg) {
first_seg = ring->first_seg;
seg = first_seg->next;
while (seg != first_seg) {
struct xhci_segment *next = seg->next;
xhci_segment_free(xhci, seg);
seg = next;
}
xhci_segment_free(xhci, first_seg);
ring->first_seg = NULL;
}
if (ring->first_seg)
xhci_free_segments_for_ring(xhci, ring->first_seg);
kfree(ring);
}
@ -143,6 +147,38 @@ static void xhci_initialize_ring_info(struct xhci_ring *ring)
ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1;
}
/* Allocate segments and link them for a ring */
static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,
struct xhci_segment **first, struct xhci_segment **last,
unsigned int num_segs, enum xhci_ring_type type, gfp_t flags)
{
struct xhci_segment *prev;
prev = xhci_segment_alloc(xhci, flags);
if (!prev)
return -ENOMEM;
num_segs--;
*first = prev;
while (num_segs > 0) {
struct xhci_segment *next;
next = xhci_segment_alloc(xhci, flags);
if (!next) {
xhci_free_segments_for_ring(xhci, *first);
return -ENOMEM;
}
xhci_link_segments(xhci, prev, next, type);
prev = next;
num_segs--;
}
xhci_link_segments(xhci, prev, *first, type);
*last = prev;
return 0;
}
/**
* Create a new ring with zero or more segments.
*
@ -154,7 +190,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
unsigned int num_segs, enum xhci_ring_type type, gfp_t flags)
{
struct xhci_ring *ring;
struct xhci_segment *prev;
int ret;
ring = kzalloc(sizeof *(ring), flags);
if (!ring)
@ -166,30 +202,15 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
if (num_segs == 0)
return ring;
ring->first_seg = xhci_segment_alloc(xhci, flags);
if (!ring->first_seg)
ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg,
&ring->last_seg, num_segs, type, flags);
if (ret)
goto fail;
num_segs--;
prev = ring->first_seg;
while (num_segs > 0) {
struct xhci_segment *next;
next = xhci_segment_alloc(xhci, flags);
if (!next)
goto fail;
xhci_link_segments(xhci, prev, next, type);
prev = next;
num_segs--;
}
xhci_link_segments(xhci, prev, ring->first_seg, type);
ring->last_seg = prev;
/* Only event ring does not use link TRB */
if (type != TYPE_EVENT) {
/* See section 4.9.2.1 and 6.4.4.1 */
prev->trbs[TRBS_PER_SEGMENT-1].link.control |=
ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
cpu_to_le32(LINK_TOGGLE);
}
xhci_initialize_ring_info(ring);