[PATCH 0/4] xhci fixes for usb-linus

[PATCH 0/4] xhci fixes for usb-linus

[Mathias Nyman]

Hi Greg

Some xhci fixes for usb-linus, mostly tuning quirks, but also fixing
one linked list issue.

Thanks
Mathias

Jens Glathe (1):
  usb: xhci: add XHCI_SPURIOUS_SUCCESS to ASM1042 despite being a V0.96
    controller

Mario Limonciello (1):
  xhci-pci: Set runtime PM as default policy on all xHC 1.2 or later
    devices

Mathias Nyman (2):
  xhci: Add quirk to reset host back to default state at shutdown
  xhci: Remove device endpoints from bandwidth list when freeing the
    device

 drivers/usb/host/xhci-mem.c | 20 ++++++++++-------
 drivers/usb/host/xhci-pci.c | 44 +++++++++++++------------------------
 drivers/usb/host/xhci.c     | 10 +++++++--
 drivers/usb/host/xhci.h     |  1 +
 4 files changed, 36 insertions(+), 39 deletions(-)

-- 
2.25.1

[PATCH 1/4] usb: xhci: add XHCI_SPURIOUS_SUCCESS to ASM1042 despite being a V0.96 controller

[Mathias Nyman]

From: Jens Glathe <jens.glathe@oldschoolsolutions.biz>

This appears to fix the error:
"xhci_hcd <address>; ERROR Transfer event TRB DMA ptr not part of
current TD ep_index 2 comp_code 13" that appear spuriously (or pretty
often) when using a r8152 USB3 ethernet adapter with integrated hub.

ASM1042 reports as a 0.96 controller, but appears to behave more like 1.0

Inspired by this email thread: https://markmail.org/thread/7vzqbe7t6du6qsw3

Cc: stable@vger.kernel.org
Signed-off-by: Jens Glathe <jens.glathe@oldschoolsolutions.biz>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-pci.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 40228a3d77a0..6dd3102749b7 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -306,8 +306,14 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	}
 
 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
-		pdev->device == PCI_DEVICE_ID_ASMEDIA_1042_XHCI)
+		pdev->device == PCI_DEVICE_ID_ASMEDIA_1042_XHCI) {
+		/*
+		 * try to tame the ASMedia 1042 controller which reports 0.96
+		 * but appears to behave more like 1.0
+		 */
+		xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
 		xhci->quirks |= XHCI_BROKEN_STREAMS;
+	}
 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 		pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI) {
 		xhci->quirks |= XHCI_TRUST_TX_LENGTH;
-- 
2.25.1

[PATCH 2/4] xhci: Add quirk to reset host back to default state at shutdown

[Mathias Nyman]

From: Mathias Nyman <mathias.nyman@linux.intel.com>

Systems based on Alder Lake P see significant boot time delay if
boot firmware tries to control usb ports in unexpected link states.

This is seen with self-powered usb devices that survive in U3 link
suspended state over S5.

A more generic solution to power off ports at shutdown was attempted in
commit 83810f84ecf1 ("xhci: turn off port power in shutdown")
but it caused regression.

Add host specific XHCI_RESET_TO_DEFAULT quirk which will reset host and
ports back to default state in shutdown.

Cc: stable@vger.kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-pci.c |  4 ++++
 drivers/usb/host/xhci.c     | 10 ++++++++--
 drivers/usb/host/xhci.h     |  1 +
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 6dd3102749b7..fbbd547ba12a 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -257,6 +257,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
 		xhci->quirks |= XHCI_MISSING_CAS;
 
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+	    pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI)
+		xhci->quirks |= XHCI_RESET_TO_DEFAULT;
+
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 	    (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI ||
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 5176765c4013..79d7931c048a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -810,9 +810,15 @@ void xhci_shutdown(struct usb_hcd *hcd)
 
 	spin_lock_irq(&xhci->lock);
 	xhci_halt(xhci);
-	/* Workaround for spurious wakeups at shutdown with HSW */
-	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
+
+	/*
+	 * Workaround for spurious wakeps at shutdown with HSW, and for boot
+	 * firmware delay in ADL-P PCH if port are left in U3 at shutdown
+	 */
+	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP ||
+	    xhci->quirks & XHCI_RESET_TO_DEFAULT)
 		xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
+
 	spin_unlock_irq(&xhci->lock);
 
 	xhci_cleanup_msix(xhci);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index c0964fe8ac12..cc084d9505cd 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1897,6 +1897,7 @@ struct xhci_hcd {
 #define XHCI_BROKEN_D3COLD	BIT_ULL(41)
 #define XHCI_EP_CTX_BROKEN_DCS	BIT_ULL(42)
 #define XHCI_SUSPEND_RESUME_CLKS	BIT_ULL(43)
+#define XHCI_RESET_TO_DEFAULT	BIT_ULL(44)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;
-- 
2.25.1

Re: [PATCH 2/4] xhci: Add quirk to reset host back to default state at shutdown

[Reka Norman]

On Wed, Oct 26, 2022 at 5:01 PM Mathias Nyman <mathias.nyman@intel.com> wrote:
>
> From: Mathias Nyman <mathias.nyman@linux.intel.com>
>
> Systems based on Alder Lake P see significant boot time delay if
> boot firmware tries to control usb ports in unexpected link states.
>
> This is seen with self-powered usb devices that survive in U3 link
> suspended state over S5.
>
> A more generic solution to power off ports at shutdown was attempted in
> commit 83810f84ecf1 ("xhci: turn off port power in shutdown")
> but it caused regression.
>
> Add host specific XHCI_RESET_TO_DEFAULT quirk which will reset host and
> ports back to default state in shutdown.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> ---
>  drivers/usb/host/xhci-pci.c |  4 ++++
>  drivers/usb/host/xhci.c     | 10 ++++++++--
>  drivers/usb/host/xhci.h     |  1 +
>  3 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index 6dd3102749b7..fbbd547ba12a 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -257,6 +257,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
>              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
>                 xhci->quirks |= XHCI_MISSING_CAS;
>
> +       if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> +           pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI)

We need this quirk for ADL-N too (device ID 0x54ed). Would you mind
updating the patch? Or I can send a separate patch if you prefer.

> +               xhci->quirks |= XHCI_RESET_TO_DEFAULT;
> +
>         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
>             (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI ||
>              pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI ||
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 5176765c4013..79d7931c048a 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -810,9 +810,15 @@ void xhci_shutdown(struct usb_hcd *hcd)
>
>         spin_lock_irq(&xhci->lock);
>         xhci_halt(xhci);
> -       /* Workaround for spurious wakeups at shutdown with HSW */
> -       if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
> +
> +       /*
> +        * Workaround for spurious wakeps at shutdown with HSW, and for boot
> +        * firmware delay in ADL-P PCH if port are left in U3 at shutdown
> +        */
> +       if (xhci->quirks & XHCI_SPURIOUS_WAKEUP ||
> +           xhci->quirks & XHCI_RESET_TO_DEFAULT)
>                 xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
> +
>         spin_unlock_irq(&xhci->lock);
>
>         xhci_cleanup_msix(xhci);
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index c0964fe8ac12..cc084d9505cd 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1897,6 +1897,7 @@ struct xhci_hcd {
>  #define XHCI_BROKEN_D3COLD     BIT_ULL(41)
>  #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42)
>  #define XHCI_SUSPEND_RESUME_CLKS       BIT_ULL(43)
> +#define XHCI_RESET_TO_DEFAULT  BIT_ULL(44)
>
>         unsigned int            num_active_eps;
>         unsigned int            limit_active_eps;
> --
> 2.25.1
>

Re: [PATCH 2/4] xhci: Add quirk to reset host back to default state at shutdown

[Greg KH]

On Wed, Oct 26, 2022 at 05:40:10PM +1100, Reka Norman wrote:
> On Wed, Oct 26, 2022 at 5:01 PM Mathias Nyman <mathias.nyman@intel.com> wrote:
> >
> > From: Mathias Nyman <mathias.nyman@linux.intel.com>
> >
> > Systems based on Alder Lake P see significant boot time delay if
> > boot firmware tries to control usb ports in unexpected link states.
> >
> > This is seen with self-powered usb devices that survive in U3 link
> > suspended state over S5.
> >
> > A more generic solution to power off ports at shutdown was attempted in
> > commit 83810f84ecf1 ("xhci: turn off port power in shutdown")
> > but it caused regression.
> >
> > Add host specific XHCI_RESET_TO_DEFAULT quirk which will reset host and
> > ports back to default state in shutdown.
> >
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> > ---
> >  drivers/usb/host/xhci-pci.c |  4 ++++
> >  drivers/usb/host/xhci.c     | 10 ++++++++--
> >  drivers/usb/host/xhci.h     |  1 +
> >  3 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > index 6dd3102749b7..fbbd547ba12a 100644
> > --- a/drivers/usb/host/xhci-pci.c
> > +++ b/drivers/usb/host/xhci-pci.c
> > @@ -257,6 +257,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> >              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
> >                 xhci->quirks |= XHCI_MISSING_CAS;
> >
> > +       if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> > +           pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI)
> 
> We need this quirk for ADL-N too (device ID 0x54ed). Would you mind
> updating the patch? Or I can send a separate patch if you prefer.

A separate patch is required, please submit it.

thanks,

greg k-h

Re: [PATCH 2/4] xhci: Add quirk to reset host back to default state at shutdown

[Reka Norman]

On Wed, Oct 26, 2022 at 5:59 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Wed, Oct 26, 2022 at 05:40:10PM +1100, Reka Norman wrote:
> > On Wed, Oct 26, 2022 at 5:01 PM Mathias Nyman <mathias.nyman@intel.com> wrote:
> > >
> > > From: Mathias Nyman <mathias.nyman@linux.intel.com>
> > >
> > > Systems based on Alder Lake P see significant boot time delay if
> > > boot firmware tries to control usb ports in unexpected link states.
> > >
> > > This is seen with self-powered usb devices that survive in U3 link
> > > suspended state over S5.
> > >
> > > A more generic solution to power off ports at shutdown was attempted in
> > > commit 83810f84ecf1 ("xhci: turn off port power in shutdown")
> > > but it caused regression.
> > >
> > > Add host specific XHCI_RESET_TO_DEFAULT quirk which will reset host and
> > > ports back to default state in shutdown.
> > >
> > > Cc: stable@vger.kernel.org
> > > Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> > > ---
> > >  drivers/usb/host/xhci-pci.c |  4 ++++
> > >  drivers/usb/host/xhci.c     | 10 ++++++++--
> > >  drivers/usb/host/xhci.h     |  1 +
> > >  3 files changed, 13 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > > index 6dd3102749b7..fbbd547ba12a 100644
> > > --- a/drivers/usb/host/xhci-pci.c
> > > +++ b/drivers/usb/host/xhci-pci.c
> > > @@ -257,6 +257,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> > >              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
> > >                 xhci->quirks |= XHCI_MISSING_CAS;
> > >
> > > +       if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> > > +           pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI)
> >
> > We need this quirk for ADL-N too (device ID 0x54ed). Would you mind
> > updating the patch? Or I can send a separate patch if you prefer.
>
> A separate patch is required, please submit it.

Done, thanks.
https://lore.kernel.org/linux-usb/20221027053407.421783-1-rekanorman@chromium.org

>
> thanks,
>
> greg k-h

[PATCH 3/4] xhci-pci: Set runtime PM as default policy on all xHC 1.2 or later devices

[Mathias Nyman]

From: Mario Limonciello <mario.limonciello@amd.com>

For optimal power consumption of USB4 routers the XHCI PCIe endpoint
used for tunneling must be in D3.  Historically this is accomplished
by a long list of PCIe IDs that correspond to these endpoints because
the xhci_hcd driver will not default to allowing runtime PM for all
devices.

As both AMD and Intel have released new products with new XHCI controllers
this list continues to grow. In reviewing the XHCI specification v1.2 on
page 607 there is already a requirement that the PCI power management
states D3hot and D3cold must be supported.

In the quirk list, use this to indicate that runtime PM should be allowed
on XHCI controllers. The following controllers are known to be xHC 1.2 and
dropped explicitly:
* AMD Yellow Carp
* Intel Alder Lake
* Intel Meteor Lake
* Intel Raptor Lake

[keep PCI ID for Alder Lake PCH for recently added quirk -Mathias]
Cc: stable@vger.kernel.org
Suggested-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/extensible-host-controler-interface-usb-xhci.pdf
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-pci.c | 32 ++++----------------------------
 1 file changed, 4 insertions(+), 28 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index fbbd547ba12a..7bccbe50bab1 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -58,25 +58,13 @@
 #define PCI_DEVICE_ID_INTEL_CML_XHCI			0xa3af
 #define PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI		0x9a13
 #define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI		0x1138
-#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_XHCI		0x461e
-#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_XHCI		0x464e
-#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI	0x51ed
-#define PCI_DEVICE_ID_INTEL_RAPTOR_LAKE_XHCI		0xa71e
-#define PCI_DEVICE_ID_INTEL_METEOR_LAKE_XHCI		0x7ec0
+#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI		0x51ed
 
 #define PCI_DEVICE_ID_AMD_RENOIR_XHCI			0x1639
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_4			0x43b9
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_3			0x43ba
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_2			0x43bb
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_1			0x43bc
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_1		0x161a
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_2		0x161b
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_3		0x161d
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_4		0x161e
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_5		0x15d6
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_6		0x15d7
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_7		0x161c
-#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_8		0x161f
 
 #define PCI_DEVICE_ID_ASMEDIA_1042_XHCI			0x1042
 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI		0x1142
@@ -272,12 +260,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_N_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_RAPTOR_LAKE_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_METEOR_LAKE_XHCI))
+	     pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI))
 		xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
@@ -346,15 +329,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4))
 		xhci->quirks |= XHCI_NO_SOFT_RETRY;
 
-	if (pdev->vendor == PCI_VENDOR_ID_AMD &&
-	    (pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_1 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_2 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_3 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_4 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_5 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_6 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_7 ||
-	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_8))
+	/* xHC spec requires PCI devices to support D3hot and D3cold */
+	if (xhci->hci_version >= 0x120)
 		xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 
 	if (xhci->quirks & XHCI_RESET_ON_RESUME)
-- 
2.25.1

[PATCH 4/4] xhci: Remove device endpoints from bandwidth list when freeing the device

[Mathias Nyman]

From: Mathias Nyman <mathias.nyman@linux.intel.com>

Endpoints are normally deleted from the bandwidth list when they are
dropped, before the virt device is freed.

If xHC host is dying or being removed then the endpoints aren't dropped
cleanly due to functions returning early to avoid interacting with a
non-accessible host controller.

So check and delete endpoints that are still on the bandwidth list when
freeing the virt device.

Solves a list_del corruption kernel crash when unbinding xhci-pci,
caused by xhci_mem_cleanup() when it later tried to delete already freed
endpoints from the bandwidth list.

This only affects hosts that use software bandwidth checking, which
currenty is only the xHC in intel Panther Point PCH (Ivy Bridge)

Cc: stable@vger.kernel.org
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-mem.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 9e56aa28efcd..81ca2bc1f0be 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -889,15 +889,19 @@ void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
 		if (dev->eps[i].stream_info)
 			xhci_free_stream_info(xhci,
 					dev->eps[i].stream_info);
-		/* Endpoints on the TT/root port lists should have been removed
-		 * when usb_disable_device() was called for the device.
-		 * We can't drop them anyway, because the udev might have gone
-		 * away by this point, and we can't tell what speed it was.
+		/*
+		 * Endpoints are normally deleted from the bandwidth list when
+		 * endpoints are dropped, before device is freed.
+		 * If host is dying or being removed then endpoints aren't
+		 * dropped cleanly, so delete the endpoint from list here.
+		 * Only applicable for hosts with software bandwidth checking.
 		 */
-		if (!list_empty(&dev->eps[i].bw_endpoint_list))
-			xhci_warn(xhci, "Slot %u endpoint %u "
-					"not removed from BW list!\n",
-					slot_id, i);
+
+		if (!list_empty(&dev->eps[i].bw_endpoint_list)) {
+			list_del_init(&dev->eps[i].bw_endpoint_list);
+			xhci_dbg(xhci, "Slot %u endpoint %u not removed from BW list!\n",
+				 slot_id, i);
+		}
 	}
 	/* If this is a hub, free the TT(s) from the TT list */
 	xhci_free_tt_info(xhci, dev, slot_id);
-- 
2.25.1