Re: [PATCH] USB: EHCI: fix for leaking isochronous data

From: Soeren Moch
Date: Thu Mar 14 2013 - 20:00:26 EST

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In reply to: Alan Stern: "Re: [PATCH] USB: EHCI: fix for leaking isochronous data"
Next in thread: Alan Stern: "Re: [PATCH] USB: EHCI: fix for leaking isochronous data"
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On 14.03.2013 22:33, Alan Stern wrote:

On Thu, 14 Mar 2013, Soeren Moch wrote:

If the memory really is being leaked here in some sort of systematic
way, we may be able to see it in your debugging output after a few
seconds.

OK, here are the first seconds of the log. But the buffer exhaustion
usually occurs after several hours of runtime...

The log shows a 1-1 match between allocations and deallocations, except
for three excess allocations about 45 lines before the end. I have no
idea what's up with those. They may be an artifact arising from where
you stopped copying the log data.

There are as many as 400 iTDs being allocated before any are freed.
That seems like a lot. Are they all for the same isochronous endpoint?
What's the endpoint's period? How often are URBs submitted?

I use 2 dvb sticks, capturing digital TV. For each stick 5 URBs on a single endpoint are used, I think. I'm not sure, which endpoint in which alternateSetting is active. I attached the output of 'lsusb -v' for the sticks.
How can I track down the other information you need?

In general, there shouldn't be more than a couple of millisecond's
worth of iTDs allocated for any endpoint, depending on how many URBs
are in the pipeline at any time.

Maybe the em28xx driver is not doing a good job here!?

Soeren Moch

Maybe a better way to go about this is, instead of printing out every
allocation and deallocation, to keep a running counter. You could have
the driver print out the value of this counter every minute or so. Any
time the device isn't in use, the counter should be 0.

Alan Stern

Bus 001 Device 005: ID 0ccd:00b2 TerraTec Electronic GmbH
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0ccd TerraTec Electronic GmbH
idProduct 0x00b2
bcdDevice 1.00
iManufacturer 3 TERRATEC
iProduct 1 Cinergy HTC Stick
iSerial 2 123456789ABCD
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 305
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 2
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
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bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
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wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 3
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
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bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 4
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x1300 3x 768 bytes
bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 5
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
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wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
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Usage Type Data
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bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
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bmAttributes 1
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bDescriptorType 5
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bInterval 1
Interface Descriptor:
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bAlternateSetting 6
bNumEndpoints 4
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bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
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bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 7
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)

Bus 001 Device 006: ID 2304:0242 Pinnacle Systems, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2304 Pinnacle Systems, Inc.
idProduct 0x0242
bcdDevice 1.00
iManufacturer 1 Pinnacle Systems
iProduct 2 PCTV 510e
iSerial 3 123456789012
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 305
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
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iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
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Transfer Type Interrupt
Synch Type None
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
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bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
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bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
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bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
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bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
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Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
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bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 3
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
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wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
wMaxPacketSize 0x0c00 2x 1024 bytes
bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
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Usage Type Data
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bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
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bInterval 1
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bDescriptorType 4
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Endpoint Descriptor:
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bDescriptorType 5
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bEndpointAddress 0x82 EP 2 IN
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
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bInterval 1
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
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bInterval 4
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bmAttributes 1
Transfer Type Isochronous
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bInterval 1
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bDescriptorType 4
bInterfaceNumber 0
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bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
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bInterval 11
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
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bInterval 1
Endpoint Descriptor:
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bmAttributes 1
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bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
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Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 7
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)

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Next message: Stephen Boyd: "[PATCH] ARM: sched_clock: Add more notrace to prevent recursion"
Previous message: Doug Anderson: "[PATCH] usb: ehci-s5p: Use devm for requesting ehci_vbus_gpio"
In reply to: Alan Stern: "Re: [PATCH] USB: EHCI: fix for leaking isochronous data"
Next in thread: Alan Stern: "Re: [PATCH] USB: EHCI: fix for leaking isochronous data"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]