Bug 159589

Summary:	Issues with se401 v4l driver
Product:	[Fedora] Fedora	Reporter:	Kars de Jong <jongk>
Component:	kernel	Assignee:	Dave Jones <davej>
Status:	CLOSED CANTFIX	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3	CC:	pfrields, wtogami
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-10-25 07:56:18 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Kars de Jong 2005-06-05 09:18:14 UTC

From Bugzilla Helper:
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Description of problem:
When connecting a Kensington USB webcam, the kernel complains about a missing release callback in the driver.

But, what is worse, when actually using it, it seems the driver calls a function which may sleep from interrupt context.

The camera does seem to work though.


Version-Release number of selected component (if applicable):
kernel-2.6.11-1.27_FC3

How reproducible:
Always

Steps to Reproduce:
1. Plug in webcam
2. Start gnomemeeting (for instance)

  

Actual Results:  Lots of entries in the kernel log file.

Expected Results:  No entries in the kernel log file.

Additional info:

This is the message in the log after plugging the camera in:

drivers/usb/media/se401.c: SE401 usb camera driver version 0.24 registering
videodev: "Kensington VideoCAM 67016" has no release callback. Please fix your driver for proper sysfs support, see http://lwn.net/Articles/36850/

And this is the message that keeps being logged when the camera is in use:

Debug: sleeping function called from invalid context at mm/slab.c:2088
in_atomic():1, irqs_disabled():1
 [<c011bfbe>] __might_sleep+0x9c/0xa4
 [<c0154e85>] __kmalloc+0x7c/0x7e
 [<e098565d>] ohci_urb_enqueue+0x81/0x5be [ohci_hcd]
 [<c0119da0>] activate_task+0x56/0x65
 [<c02bf741>] hcd_submit_urb+0x1b5/0x304
 [<c011ab09>] __wake_up_common+0x35/0x55
 [<c02c059a>] usb_submit_urb+0x1bd/0x2bb
 [<e0adc5c5>] se401_video_irq+0x7d/0x1ff [se401]
 [<c02c0110>] usb_hcd_giveback_urb+0x17/0x49
 [<e0984175>] finish_urb+0xc6/0x2c2 [ohci_hcd]
 [<e09854d9>] finish_unlinks+0x245/0x284 [ohci_hcd]
 [<e09855cb>] dl_done_list+0xb3/0xc4 [ohci_hcd]
 [<e09868cb>] ohci_irq+0xed/0x361 [ohci_hcd]
 [<c010878f>] timer_interrupt+0x80/0x22e
 [<c02c0166>] usb_hcd_irq+0x24/0x57
 [<c0148640>] handle_IRQ_event+0x31/0x62
 [<c014872f>] __do_IRQ+0xbe/0x31f
 [<c010564f>] do_IRQ+0x4c/0x85
 =======================
 [<c0103a72>] common_interrupt+0x1a/0x20

Comment 1 Dave Jones 2005-07-15 19:40:44 UTC

An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which
may contain a fix for your problem.   Please update to this new kernel, and
report whether or not it fixes your problem.

If you have updated to Fedora Core 4 since this bug was opened, and the problem
still occurs with the latest updates for that release, please change the version
field of this bug to 'fc4'.

Thank you.

Comment 2 Kars de Jong 2005-08-27 13:14:06 UTC

Sorry, I no longer run Fedora, so I can't test this anymore.
However, with Debian (running kernel 2.6.8-2-k7) the "release callback" warning
is present there too, but not the other "sleeping function called from invalid
context at mm/slab.c:2088" warning.