[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Adam Wallis]

Currently, xhci_plat is not set up properly when the parent device is an
ACPI node. The conditions that xhci_plat_probe should satisfy are

1. xhci_plat comes from firmware
2. xhci_plat is child of a device from firmware (dwc3-plat)
3. xhci_plat is grandchild of a pci device (dwc3-pci)

Case 2 is covered when the child is an OF node (by checking
sysdev->parent->of_node), however, an ACPI parent will return NULL in
the of_node check and will thus not result in sysdev being set to
sysdev->parent

[   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5

This change adds a check for ACPI to completely allow for condition 2.
This is done by first checking if the parent node is of type ACPI (e.g.,
dwc3-plat) and set sysdev to sysdev->parent if either of the two
following conditions are met:

1: If fwnode is empty (in the case that platform_device_add_properties
was not called on the allocated platform device)
2: fwnode exists but is not of type ACPI (this would happen if
platform_device_add_properties was called on the allocated device.
Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)

Cc: stable at vger.kernel.org #4.12.x
Cc: stable at vger.kernel.org #4.13.x

Signed-off-by: Adam Wallis <awallis@codeaurora.org>
---
Changes in v2: Incorporate the simplified fwnode check as suggested
by Mathias

 drivers/usb/host/xhci-plat.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index c04144b..2087407 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -186,14 +186,18 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	 * 2. xhci_plat is child of a device from firmware (dwc3-plat)
 	 * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
 	 */
-	sysdev = &pdev->dev;
-	if (sysdev->parent && !sysdev->of_node && sysdev->parent->of_node)
-		sysdev = sysdev->parent;
+	for (sysdev = &pdev->dev; sysdev; sysdev = sysdev->parent) {
+		if (is_of_node(sysdev->fwnode) ||
+			is_acpi_device_node(sysdev->fwnode))
+			break;
 #ifdef CONFIG_PCI
-	else if (sysdev->parent && sysdev->parent->parent &&
-		 sysdev->parent->parent->bus == &pci_bus_type)
-		sysdev = sysdev->parent->parent;
+		else if (sysdev->bus == &pci_bus_type)
+			break;
 #endif
+	}
+
+	if (!sysdev)
+		sysdev = &pdev->dev;
 
 	/* Try to set 64-bit DMA first */
 	if (WARN_ON(!sysdev->dma_mask))
-- 
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Greg Kroah-Hartman]

On Tue, Sep 05, 2017 at 09:57:29AM -0400, Adam Wallis wrote:
> Currently, xhci_plat is not set up properly when the parent device is an
> ACPI node. The conditions that xhci_plat_probe should satisfy are
> 
> 1. xhci_plat comes from firmware
> 2. xhci_plat is child of a device from firmware (dwc3-plat)
> 3. xhci_plat is grandchild of a pci device (dwc3-pci)
> 
> Case 2 is covered when the child is an OF node (by checking
> sysdev->parent->of_node), however, an ACPI parent will return NULL in
> the of_node check and will thus not result in sysdev being set to
> sysdev->parent
> 
> [   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5
> 
> This change adds a check for ACPI to completely allow for condition 2.
> This is done by first checking if the parent node is of type ACPI (e.g.,
> dwc3-plat) and set sysdev to sysdev->parent if either of the two
> following conditions are met:
> 
> 1: If fwnode is empty (in the case that platform_device_add_properties
> was not called on the allocated platform device)
> 2: fwnode exists but is not of type ACPI (this would happen if
> platform_device_add_properties was called on the allocated device.
> Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)
> 
> Cc: stable at vger.kernel.org #4.12.x
> Cc: stable at vger.kernel.org #4.13.x

What bug is this fixing that needs to go into the stable kernel trees?
Is this a regression, or a new feature for those versions?

thanks,

greg k-h

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Adam Wallis]

On 9/5/2017 10:16 AM, Greg Kroah-Hartman wrote:
> On Tue, Sep 05, 2017 at 09:57:29AM -0400, Adam Wallis wrote:
>> Currently, xhci_plat is not set up properly when the parent device is an
>> ACPI node. The conditions that xhci_plat_probe should satisfy are
>>
>> 1. xhci_plat comes from firmware
>> 2. xhci_plat is child of a device from firmware (dwc3-plat)
>> 3. xhci_plat is grandchild of a pci device (dwc3-pci)
>>
>> Case 2 is covered when the child is an OF node (by checking
>> sysdev->parent->of_node), however, an ACPI parent will return NULL in
>> the of_node check and will thus not result in sysdev being set to
>> sysdev->parent
>>
>> [   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5
>>
>> This change adds a check for ACPI to completely allow for condition 2.
>> This is done by first checking if the parent node is of type ACPI (e.g.,
>> dwc3-plat) and set sysdev to sysdev->parent if either of the two
>> following conditions are met:
>>
>> 1: If fwnode is empty (in the case that platform_device_add_properties
>> was not called on the allocated platform device)
>> 2: fwnode exists but is not of type ACPI (this would happen if
>> platform_device_add_properties was called on the allocated device.
>> Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)
>>
>> Cc: stable at vger.kernel.org #4.12.x
>> Cc: stable at vger.kernel.org #4.13.x
> 
> What bug is this fixing that needs to go into the stable kernel trees?
> Is this a regression, or a new feature for those versions?
> 
Greg

The following patch

4c39d4b949d36f usb: xhci: use bus->sysdev for DMA configuration

provided an incomplete check for all firmware nodes (only checked for PCI and OF
case, but not the ACPI case). This bug affects the 4.12 and 4.13 kernels.

Adam

> thanks,
> 
> greg k-h
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 


-- 
Adam Wallis
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Greg Kroah-Hartman]

On Tue, Sep 05, 2017 at 10:25:19AM -0400, Adam Wallis wrote:
> On 9/5/2017 10:16 AM, Greg Kroah-Hartman wrote:
> > On Tue, Sep 05, 2017 at 09:57:29AM -0400, Adam Wallis wrote:
> >> Currently, xhci_plat is not set up properly when the parent device is an
> >> ACPI node. The conditions that xhci_plat_probe should satisfy are
> >>
> >> 1. xhci_plat comes from firmware
> >> 2. xhci_plat is child of a device from firmware (dwc3-plat)
> >> 3. xhci_plat is grandchild of a pci device (dwc3-pci)
> >>
> >> Case 2 is covered when the child is an OF node (by checking
> >> sysdev->parent->of_node), however, an ACPI parent will return NULL in
> >> the of_node check and will thus not result in sysdev being set to
> >> sysdev->parent
> >>
> >> [   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5
> >>
> >> This change adds a check for ACPI to completely allow for condition 2.
> >> This is done by first checking if the parent node is of type ACPI (e.g.,
> >> dwc3-plat) and set sysdev to sysdev->parent if either of the two
> >> following conditions are met:
> >>
> >> 1: If fwnode is empty (in the case that platform_device_add_properties
> >> was not called on the allocated platform device)
> >> 2: fwnode exists but is not of type ACPI (this would happen if
> >> platform_device_add_properties was called on the allocated device.
> >> Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)
> >>
> >> Cc: stable at vger.kernel.org #4.12.x
> >> Cc: stable at vger.kernel.org #4.13.x
> > 
> > What bug is this fixing that needs to go into the stable kernel trees?
> > Is this a regression, or a new feature for those versions?
> > 
> Greg
> 
> The following patch
> 
> 4c39d4b949d36f usb: xhci: use bus->sysdev for DMA configuration
> 
> provided an incomplete check for all firmware nodes (only checked for PCI and OF
> case, but not the ACPI case). This bug affects the 4.12 and 4.13 kernels.

What is the symptom of "incomplete check"?  Something that used to work
now does not?  Or just that it doesn't work "correctly" and this patch
resolves that issue so that new hardware can now work properly?  I ask
as you have read the stable kernel rules, right?

thanks,

greg k-h

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Adam Wallis]

On 9/5/2017 10:31 AM, Greg Kroah-Hartman wrote:
> On Tue, Sep 05, 2017 at 10:25:19AM -0400, Adam Wallis wrote:
>> On 9/5/2017 10:16 AM, Greg Kroah-Hartman wrote:
>>> On Tue, Sep 05, 2017 at 09:57:29AM -0400, Adam Wallis wrote:
>>>> Currently, xhci_plat is not set up properly when the parent device is an
>>>> ACPI node. The conditions that xhci_plat_probe should satisfy are
>>>>
>>>> 1. xhci_plat comes from firmware
>>>> 2. xhci_plat is child of a device from firmware (dwc3-plat)
>>>> 3. xhci_plat is grandchild of a pci device (dwc3-pci)
>>>>
>>>> Case 2 is covered when the child is an OF node (by checking
>>>> sysdev->parent->of_node), however, an ACPI parent will return NULL in
>>>> the of_node check and will thus not result in sysdev being set to
>>>> sysdev->parent
>>>>
>>>> [   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5
>>>>
>>>> This change adds a check for ACPI to completely allow for condition 2.
>>>> This is done by first checking if the parent node is of type ACPI (e.g.,
>>>> dwc3-plat) and set sysdev to sysdev->parent if either of the two
>>>> following conditions are met:
>>>>
>>>> 1: If fwnode is empty (in the case that platform_device_add_properties
>>>> was not called on the allocated platform device)
>>>> 2: fwnode exists but is not of type ACPI (this would happen if
>>>> platform_device_add_properties was called on the allocated device.
>>>> Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)
>>>>
>>>> Cc: stable at vger.kernel.org #4.12.x
>>>> Cc: stable at vger.kernel.org #4.13.x
>>>
>>> What bug is this fixing that needs to go into the stable kernel trees?
>>> Is this a regression, or a new feature for those versions?
>>>
>> Greg
>>
>> The following patch
>>
>> 4c39d4b949d36f usb: xhci: use bus->sysdev for DMA configuration
>>
>> provided an incomplete check for all firmware nodes (only checked for PCI and OF
>> case, but not the ACPI case). This bug affects the 4.12 and 4.13 kernels.
> 
> What is the symptom of "incomplete check"?  Something that used to work
> now does not?  Or just that it doesn't work "correctly" and this patch
> resolves that issue so that new hardware can now work properly?  
Greg, the change I reference above broke behavior that previously worked.
Previously, it was possible to have a an ACPI host driver (e.g., dwc3) that
created a platform xhci device as a child. The above change removed the ability
to have a parent ACPI device to the platform xhci platform device (so drivers
like dwc3 host do not work with ACPI now in 4.12/4.13)

I ask
> as you have read the stable kernel rules, right?

I have read the rules. Are you asking for me to update my sign-off area with the
fix commit information?

> 
> thanks,
> 
> greg k-h
> 

Thank you for your help

Adam

-- 
Adam Wallis
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

[PATCH V2] usb: host: xhci-plat: allow sysdev to inherit from ACPI

[Greg Kroah-Hartman]

On Tue, Sep 05, 2017 at 10:38:03AM -0400, Adam Wallis wrote:
> On 9/5/2017 10:31 AM, Greg Kroah-Hartman wrote:
> > On Tue, Sep 05, 2017 at 10:25:19AM -0400, Adam Wallis wrote:
> >> On 9/5/2017 10:16 AM, Greg Kroah-Hartman wrote:
> >>> On Tue, Sep 05, 2017 at 09:57:29AM -0400, Adam Wallis wrote:
> >>>> Currently, xhci_plat is not set up properly when the parent device is an
> >>>> ACPI node. The conditions that xhci_plat_probe should satisfy are
> >>>>
> >>>> 1. xhci_plat comes from firmware
> >>>> 2. xhci_plat is child of a device from firmware (dwc3-plat)
> >>>> 3. xhci_plat is grandchild of a pci device (dwc3-pci)
> >>>>
> >>>> Case 2 is covered when the child is an OF node (by checking
> >>>> sysdev->parent->of_node), however, an ACPI parent will return NULL in
> >>>> the of_node check and will thus not result in sysdev being set to
> >>>> sysdev->parent
> >>>>
> >>>> [   17.591549] xhci-hcd: probe of xhci-hcd.6.auto failed with error -5
> >>>>
> >>>> This change adds a check for ACPI to completely allow for condition 2.
> >>>> This is done by first checking if the parent node is of type ACPI (e.g.,
> >>>> dwc3-plat) and set sysdev to sysdev->parent if either of the two
> >>>> following conditions are met:
> >>>>
> >>>> 1: If fwnode is empty (in the case that platform_device_add_properties
> >>>> was not called on the allocated platform device)
> >>>> 2: fwnode exists but is not of type ACPI (this would happen if
> >>>> platform_device_add_properties was called on the allocated device.
> >>>> Instead of type FWNODE_ACPI, you would end up with FWNODE_PDATA)
> >>>>
> >>>> Cc: stable at vger.kernel.org #4.12.x
> >>>> Cc: stable at vger.kernel.org #4.13.x
> >>>
> >>> What bug is this fixing that needs to go into the stable kernel trees?
> >>> Is this a regression, or a new feature for those versions?
> >>>
> >> Greg
> >>
> >> The following patch
> >>
> >> 4c39d4b949d36f usb: xhci: use bus->sysdev for DMA configuration
> >>
> >> provided an incomplete check for all firmware nodes (only checked for PCI and OF
> >> case, but not the ACPI case). This bug affects the 4.12 and 4.13 kernels.
> > 
> > What is the symptom of "incomplete check"?  Something that used to work
> > now does not?  Or just that it doesn't work "correctly" and this patch
> > resolves that issue so that new hardware can now work properly?  
> Greg, the change I reference above broke behavior that previously worked.
> Previously, it was possible to have a an ACPI host driver (e.g., dwc3) that
> created a platform xhci device as a child. The above change removed the ability
> to have a parent ACPI device to the platform xhci platform device (so drivers
> like dwc3 host do not work with ACPI now in 4.12/4.13)

Ok, then provide this information with a "Fixes:" tag please.

thanks,

greg k-h