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Subject[PATCH 5.10 012/120] usb: xhci-mtk: skip dropping bandwidth of unchecked endpoints
Date
From: Chunfeng Yun <chunfeng.yun@mediatek.com>

commit 54f6a8af372213a254af6609758d99f7c0b6b5ad upstream.

For those unchecked endpoints, we don't allocate bandwidth for
them, so no need free the bandwidth, otherwise will decrease
the allocated bandwidth.
Meanwhile use xhci_dbg() instead of dev_dbg() to print logs and
rename bw_ep_list_new as bw_ep_chk_list.

Fixes: 1d69f9d901ef ("usb: xhci-mtk: fix unreleased bandwidth data")
Cc: stable <stable@vger.kernel.org>
Reviewed-and-tested-by: Ikjoon Jang <ikjn@chromium.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1612159064-28413-1-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/host/xhci-mtk-sch.c | 61 +++++++++++++++++++++-------------------
drivers/usb/host/xhci-mtk.h | 4 +-
2 files changed, 36 insertions(+), 29 deletions(-)

--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -200,6 +200,7 @@ static struct mu3h_sch_ep_info *create_s

sch_ep->sch_tt = tt;
sch_ep->ep = ep;
+ INIT_LIST_HEAD(&sch_ep->endpoint);
INIT_LIST_HEAD(&sch_ep->tt_endpoint);

return sch_ep;
@@ -374,6 +375,7 @@ static void update_bus_bw(struct mu3h_sc
sch_ep->bw_budget_table[j];
}
}
+ sch_ep->allocated = used;
}

static int check_sch_tt(struct usb_device *udev,
@@ -542,6 +544,22 @@ static int check_sch_bw(struct usb_devic
return 0;
}

+static void destroy_sch_ep(struct usb_device *udev,
+ struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
+{
+ /* only release ep bw check passed by check_sch_bw() */
+ if (sch_ep->allocated)
+ update_bus_bw(sch_bw, sch_ep, 0);
+
+ list_del(&sch_ep->endpoint);
+
+ if (sch_ep->sch_tt) {
+ list_del(&sch_ep->tt_endpoint);
+ drop_tt(udev);
+ }
+ kfree(sch_ep);
+}
+
static bool need_bw_sch(struct usb_host_endpoint *ep,
enum usb_device_speed speed, int has_tt)
{
@@ -584,7 +602,7 @@ int xhci_mtk_sch_init(struct xhci_hcd_mt

mtk->sch_array = sch_array;

- INIT_LIST_HEAD(&mtk->bw_ep_list_new);
+ INIT_LIST_HEAD(&mtk->bw_ep_chk_list);

return 0;
}
@@ -636,29 +654,12 @@ int xhci_mtk_add_ep_quirk(struct usb_hcd

setup_sch_info(udev, ep_ctx, sch_ep);

- list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_list_new);
+ list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_chk_list);

return 0;
}
EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);

-static void xhci_mtk_drop_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
- struct mu3h_sch_ep_info *sch_ep)
-{
- struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
- int bw_index = get_bw_index(xhci, udev, sch_ep->ep);
- struct mu3h_sch_bw_info *sch_bw = &mtk->sch_array[bw_index];
-
- update_bus_bw(sch_bw, sch_ep, 0);
- list_del(&sch_ep->endpoint);
-
- if (sch_ep->sch_tt) {
- list_del(&sch_ep->tt_endpoint);
- drop_tt(udev);
- }
- kfree(sch_ep);
-}
-
void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep)
{
@@ -688,9 +689,8 @@ void xhci_mtk_drop_ep_quirk(struct usb_h
sch_bw = &sch_array[bw_index];

list_for_each_entry_safe(sch_ep, tmp, &sch_bw->bw_ep_list, endpoint) {
- if (sch_ep->ep == ep) {
- xhci_mtk_drop_ep(mtk, udev, sch_ep);
- }
+ if (sch_ep->ep == ep)
+ destroy_sch_ep(udev, sch_bw, sch_ep);
}
}
EXPORT_SYMBOL_GPL(xhci_mtk_drop_ep_quirk);
@@ -704,9 +704,9 @@ int xhci_mtk_check_bandwidth(struct usb_
struct mu3h_sch_ep_info *sch_ep, *tmp;
int bw_index, ret;

- dev_dbg(&udev->dev, "%s\n", __func__);
+ xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));

- list_for_each_entry(sch_ep, &mtk->bw_ep_list_new, endpoint) {
+ list_for_each_entry(sch_ep, &mtk->bw_ep_chk_list, endpoint) {
bw_index = get_bw_index(xhci, udev, sch_ep->ep);
sch_bw = &mtk->sch_array[bw_index];

@@ -717,7 +717,7 @@ int xhci_mtk_check_bandwidth(struct usb_
}
}

- list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
+ list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint) {
struct xhci_ep_ctx *ep_ctx;
struct usb_host_endpoint *ep = sch_ep->ep;
unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);
@@ -746,12 +746,17 @@ EXPORT_SYMBOL_GPL(xhci_mtk_check_bandwid
void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
{
struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct mu3h_sch_bw_info *sch_bw;
struct mu3h_sch_ep_info *sch_ep, *tmp;
+ int bw_index;

- dev_dbg(&udev->dev, "%s\n", __func__);
+ xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));

- list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_list_new, endpoint) {
- xhci_mtk_drop_ep(mtk, udev, sch_ep);
+ list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint) {
+ bw_index = get_bw_index(xhci, udev, sch_ep->ep);
+ sch_bw = &mtk->sch_array[bw_index];
+ destroy_sch_ep(udev, sch_bw, sch_ep);
}

xhci_reset_bandwidth(hcd, udev);
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -59,6 +59,7 @@ struct mu3h_sch_bw_info {
* @ep_type: endpoint type
* @maxpkt: max packet size of endpoint
* @ep: address of usb_host_endpoint struct
+ * @allocated: the bandwidth is aready allocated from bus_bw
* @offset: which uframe of the interval that transfer should be
* scheduled first time within the interval
* @repeat: the time gap between two uframes that transfers are
@@ -86,6 +87,7 @@ struct mu3h_sch_ep_info {
u32 ep_type;
u32 maxpkt;
void *ep;
+ bool allocated;
/*
* mtk xHCI scheduling information put into reserved DWs
* in ep context
@@ -130,8 +132,8 @@ struct mu3c_ippc_regs {
struct xhci_hcd_mtk {
struct device *dev;
struct usb_hcd *hcd;
- struct list_head bw_ep_list_new;
struct mu3h_sch_bw_info *sch_array;
+ struct list_head bw_ep_chk_list;
struct mu3c_ippc_regs __iomem *ippc_regs;
bool has_ippc;
int num_u2_ports;

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