The remainder of the last bandwidth bugdget is wrong,
it's the value alloacted in last bugdget, not unused.
Reported-by: Yaqii Wu <Yaqii.Wu@xxxxxxxxxxxx>
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
---
drivers/usb/host/xhci-mtk-sch.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index a59d1f6d4744..7ac76ae28998 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -341,7 +341,6 @@ static void setup_sch_info(struct xhci_ep_ctx *ep_ctx,
}
if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
- u32 remainder;
if (sch_ep->esit == 1)
sch_ep->pkts = esit_pkts;
@@ -357,14 +356,12 @@ static void setup_sch_info(struct xhci_ep_ctx *ep_ctx,
sch_ep->repeat = !!(sch_ep->num_budget_microframes > 1);
sch_ep->bw_cost_per_microframe = maxpkt * sch_ep->pkts;
- remainder = sch_ep->bw_cost_per_microframe;
- remainder *= sch_ep->num_budget_microframes;
- remainder -= (maxpkt * esit_pkts);
for (i = 0; i < sch_ep->num_budget_microframes - 1; i++)
bwb_table[i] = sch_ep->bw_cost_per_microframe;
/* last one <= bw_cost_per_microframe */
- bwb_table[i] = remainder;
+ bwb_table[i] = maxpkt * esit_pkts
+ - i * sch_ep->bw_cost_per_microframe;
}
} else if (is_fs_or_ls(sch_ep->speed)) {
sch_ep->pkts = 1; /* at most one packet for each microframe */
--
2.18.0
