* Re: [PATCH] ALSA: usb - prevent kernel panic on disconnect
[not found] <20110209205036.GB5606@xanatos>
@ 2011-02-09 21:06 ` pl bossart
0 siblings, 0 replies; 3+ messages in thread
From: pl bossart @ 2011-02-09 21:06 UTC (permalink / raw)
To: Sarah Sharp
Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA,
alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw, Alan Stern
[-- Attachment #1: Type: text/plain, Size: 534 bytes --]
> I notice that the audio headset seems to be missing
> from the output. Pierre, can you run lsusb -v again with the headset
> plugged in?
Sure. File attached.
> Also, is this patch against some kernel driver? I can't tell because
> you weren't in the base kernel directory when you ran the patch command.
Yes, this is a kernel patch against sound/usb/urb.c,
I tested all this with alsa-driver/alsa-kmirror so that I can compile
the alsa part only and load/unload the usb module, but the code is
identical.
-Pierre
[-- Attachment #2: lsusb-with-headset.txt --]
[-- Type: text/plain, Size: 69621 bytes --]
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Device Descriptor:
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bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0001 1.1 root hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.37 uhci_hcd
iProduct 2 UHCI Host Controller
iSerial 1 0000:00:1d.2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
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MaxPower 0mA
Interface Descriptor:
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bInterfaceProtocol 0 Full speed (or root) hub
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bmAttributes 3
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bInterval 255
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bDescriptorType 41
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No power switching (usb 1.0)
Per-port overcurrent protection
bPwrOn2PwrGood 1 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Device Status: 0x0003
Self Powered
Remote Wakeup Enabled
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0001 1.1 root hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.37 uhci_hcd
iProduct 2 UHCI Host Controller
iSerial 1 0000:00:1d.1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
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Remote Wakeup Enabled
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Device Descriptor:
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idVendor 0x1d6b Linux Foundation
idProduct 0x0001 1.1 root hub
bcdDevice 2.06
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Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
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bcdUSB 1.10
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idVendor 0x1d6b Linux Foundation
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wTotalLength 25
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Bus 004 Device 003: ID 0a5c:2145 Broadcom Corp. Bluetooth with Enhanced Data Rate II
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iManufacturer 1 Lenovo Computer Corp
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bcdUSB 2.00
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idVendor 0x1d6b Linux Foundation
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Port 3: 0000.0100 power
Port 4: 0000.0100 power
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bmaControls( 0) 27
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guidFormat {59555932-0000-1000-8000-00aa00389b71}
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dwMinBitRate 147456000
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dwMaxVideoFrameBufferSize 614400
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dwMinBitRate 73728000
dwMaxBitRate 73728000
dwMaxVideoFrameBufferSize 1228800
dwDefaultFrameInterval 1333333
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bmCapabilities 0x01
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dwMinBitRate 122880000
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dwMaxVideoFrameBufferSize 2048000
dwDefaultFrameInterval 1333333
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VideoStreaming Interface Descriptor:
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bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
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bmCapabilities 0x01
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wHeight 1024
dwMinBitRate 157286400
dwMaxBitRate 157286400
dwMaxVideoFrameBufferSize 2621440
dwDefaultFrameInterval 1333333
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bDescriptorType 36
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bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 1
bmCapabilities 0x01
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dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 614400
dwDefaultFrameInterval 333333
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dwMinFrameInterval 333332
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VideoStreaming Interface Descriptor:
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bmCapabilities 0x01
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dwMinBitRate 36864000
dwMaxBitRate 36864000
dwMaxVideoFrameBufferSize 153600
dwDefaultFrameInterval 333333
bFrameIntervalType 0
dwMinFrameInterval 333332
dwMaxFrameInterval 333333
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VideoStreaming Interface Descriptor:
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bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
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bmCapabilities 0x01
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dwMinBitRate 115200000
dwMaxBitRate 115200000
dwMaxVideoFrameBufferSize 960000
dwDefaultFrameInterval 666666
bFrameIntervalType 0
dwMinFrameInterval 666665
dwMaxFrameInterval 666666
dwFrameIntervalStep 1
VideoStreaming Interface Descriptor:
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bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 4
bmCapabilities 0x01
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wWidth 1024
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dwMinBitRate 147456000
dwMaxBitRate 147456000
dwMaxVideoFrameBufferSize 1228800
dwDefaultFrameInterval 666666
bFrameIntervalType 0
dwMinFrameInterval 666665
dwMaxFrameInterval 666666
dwFrameIntervalStep 1
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 5
bmCapabilities 0x01
Still image supported
wWidth 1024
wHeight 768
dwMinBitRate 188743680
dwMaxBitRate 188743680
dwMaxVideoFrameBufferSize 1572864
dwDefaultFrameInterval 666666
bFrameIntervalType 0
dwMinFrameInterval 666665
dwMaxFrameInterval 666666
dwFrameIntervalStep 1
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 6
bmCapabilities 0x01
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wWidth 1280
wHeight 800
dwMinBitRate 245760000
dwMaxBitRate 245760000
dwMaxVideoFrameBufferSize 2048000
dwDefaultFrameInterval 666666
bFrameIntervalType 0
dwMinFrameInterval 666665
dwMaxFrameInterval 666666
dwFrameIntervalStep 1
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 7
bmCapabilities 0x01
Still image supported
wWidth 1280
wHeight 1024
dwMinBitRate 314572800
dwMaxBitRate 314572800
dwMaxVideoFrameBufferSize 2621440
dwDefaultFrameInterval 666666
bFrameIntervalType 0
dwMinFrameInterval 666665
dwMaxFrameInterval 666666
dwFrameIntervalStep 1
Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
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wMaxPacketSize 0x13d4 3x 980 bytes
bInterval 1
Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 2
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
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bInterval 1
Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 3
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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bInterval 1
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bDescriptorType 4
bInterfaceNumber 1
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bNumEndpoints 1
bInterfaceClass 14 Video
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bEndpointAddress 0x82 EP 2 IN
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bInterfaceNumber 1
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bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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bEndpointAddress 0x82 EP 2 IN
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bInterval 1
Interface Descriptor:
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bDescriptorType 4
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bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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wMaxPacketSize 0x1400 3x 1024 bytes
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bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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Endpoint Descriptor:
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bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
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wMaxPacketSize 0x13ec 3x 1004 bytes
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Interface Descriptor:
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bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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bEndpointAddress 0x82 EP 2 IN
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wMaxPacketSize 0x13bc 3x 956 bytes
bInterval 1
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bDescriptorType 4
bInterfaceNumber 1
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bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
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wMaxPacketSize 0x0348 1x 840 bytes
bInterval 1
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 10
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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iInterface 0
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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bDescriptorType 4
bInterfaceNumber 1
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bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
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iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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bDescriptorType 4
bInterfaceNumber 1
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bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 13
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
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wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
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bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 14
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0002 2.0 root hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.37 ehci_hcd
iProduct 2 EHCI Host Controller
iSerial 1 0000:00:1a.7
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
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Interface Descriptor:
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bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
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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bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 6
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0100 power
Port 6: 0000.0503 highspeed power enable connect
Device Status: 0x0003
Self Powered
Remote Wakeup Enabled
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] ALSA: usb - prevent kernel panic on disconnect
2011-02-09 19:13 Pierre-Louis Bossart
@ 2011-02-10 2:17 ` Torsten Schenk
0 siblings, 0 replies; 3+ messages in thread
From: Torsten Schenk @ 2011-02-10 2:17 UTC (permalink / raw)
Cc: sarah.a.sharp, bossart.nospam, alsa-devel, Pierre-Louis Bossart
Hello,
I encountered a similar problem while developing drivers for the dmx 6fire usb. Perhaps my finding could provide you with some more information about the kernel panic. I found out that if the device is removed,
the isoc-packet status indicate an error in the in-urb-retire method; the urb status still is 0. This happens a few ms before the actual disconnect() handler is called.
I also looked into the snd-usb-audio driver and could not find any isoc-packet status check. Maybe this could lead to inconsistencies between PCM stream state
and urbs.
Greets, Torsten
---- On Wed, 09 Feb 2011 20:13:24 +0100 Pierre-Louis Bossart wrote ----
>Fix 100% reproducible kernel panic when a USB audio device is
>disconnected during playback. When the PCM substream is NULL, any
>dereference causes a kernel panic. This isn't a recent problem, the crash
>happened with a 2.6.35 kernel as well
>
>Note that this is only a work-around, it does not address the
>root cause of this inconsistency between urbs and PCM states. The
>dmesg below shows two calls to snd_urb_complete, the substream is
>NULL and the state is either running or stopped. This doesn't make
>any sense.
>
>Thanks to Sarah Sharp for her
>help.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] ALSA: usb - prevent kernel panic on disconnect
@ 2011-02-09 19:13 Pierre-Louis Bossart
2011-02-10 2:17 ` Torsten Schenk
0 siblings, 1 reply; 3+ messages in thread
From: Pierre-Louis Bossart @ 2011-02-09 19:13 UTC (permalink / raw)
To: alsa-devel; +Cc: sarah.a.sharp, bossart.nospam, Pierre-Louis Bossart
Fix 100% reproducible kernel panic when a USB audio device is
disconnected during playback. When the PCM substream is NULL, any
dereference causes a kernel panic. This isn't a recent problem, the crash
happened with a 2.6.35 kernel as well
Note that this is only a work-around, it does not address the
root cause of this inconsistency between urbs and PCM states. The
dmesg below shows two calls to snd_urb_complete, the substream is
NULL and the state is either running or stopped. This doesn't make
any sense.
Thanks to Sarah Sharp <sarah.a.sharp@linux.intel.com> for her
help.
usb 6-1: USB disconnect, address 16
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:492: frame 0 active: -84
ALSA urb.c:197: cannot submit urb (err = -19)
ALSA urb.c:186: NULL substream (subs->running 1) <- How is this possible?
ALSA urb.c:186: NULL substream (subs->running 0)
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
---
usb/urb.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/usb/urb.c b/usb/urb.c
index e184349..1a264c2 100644
--- a/usb/urb.c
+++ b/usb/urb.c
@@ -170,6 +170,12 @@ static void snd_complete_urb(struct urb *urb)
struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
int err = 0;
+ if (substream == NULL) {
+ snd_printd(KERN_ERR "NULL substream (subs->running %d)\n", subs->running);
+ clear_bit(ctx->index, &subs->active_mask);
+ return;
+ }
+
if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
!subs->running || /* can be stopped during retire callback */
(err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
@@ -193,6 +199,12 @@ static void snd_complete_sync_urb(struct urb *urb)
struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
int err = 0;
+ if (substream == NULL) {
+ snd_printd(KERN_ERR "NULL substream (subs->running %d)\n", subs->running);
+ clear_bit(ctx->index + 16, &subs->active_mask);
+ return;
+ }
+
if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
!subs->running || /* can be stopped during retire callback */
(err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
--
1.7.4
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[not found] <20110209205036.GB5606@xanatos>
2011-02-09 21:06 ` [PATCH] ALSA: usb - prevent kernel panic on disconnect pl bossart
2011-02-09 19:13 Pierre-Louis Bossart
2011-02-10 2:17 ` Torsten Schenk
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