Re: [PATCH] em28xx: pre-allocate DVB isoc transfer buffers

[Gianluca Gennari <gennarone@gmail.com>]

Il 16/03/2012 16:05, Andy Furniss ha scritto:
> Andy Furniss wrote:
>> Gianluca Gennari wrote:
> 
>>> Hi Andy,
>>> the patch is already in the current media_build tree and is queued for
>>> kernel 3.4.
>>
>> Ahh, I'll give that a try, thanks.
> 
> Seems to be working OK so far, I had to avoid building radio to get it
> to compile.
> 
> Are these just informational - I get five every time I tune (barring the
> first time IIRC)
> 
> Mar 16 14:56:58 noki kernel: ehci_hcd 0000:01:0a.2: shutdown urb
> ced2d000 ep4in-iso
> Mar 16 14:56:58 noki kernel: ehci_hcd 0000:01:0a.2: shutdown urb
> ced2d800 ep4in-iso
> Mar 16 14:56:58 noki kernel: ehci_hcd 0000:01:0a.2: shutdown urb
> cec3f800 ep4in-iso
> Mar 16 14:56:58 noki kernel: ehci_hcd 0000:01:0a.2: shutdown urb
> ced2c000 ep4in-iso
> Mar 16 14:56:58 noki kernel: ehci_hcd 0000:01:0a.2: shutdown urb
> ced2c800 ep4in-iso

Looks like some innocuous logging from the ehci_hcd driver. I've never
seen it because I'm not using the ehci_hcd module on my systems.
When you tune a new channel, the USB transfer is stopped (with the URBs
still alive, so the driver "shuts down" them) and a new one is started.
Then the URBs are reused (instead of being deallocated/allocated
again/cleared as before) so they are resubmitted.

Regards,
Gianluca