Re: [linux-usb-devel] Re: USB hangs

[Alan Cox]

On Llu, 2004-01-12 at 16:27, Alan Stern wrote:
> On Mon, 12 Jan 2004, Oliver Neukum wrote:
> 
> > In 2.4 they all run in interrupt or thread context IIRC.
> > Problematic is the SCSI error handling thread. It can call usb_reset_device()
> > which calls down and does allocations.
> > Does that thread also do the PF_MEMALLOC trick?
> 
> In 2.4 it doesn't, which is rather surpising considering how many storage 
> devices run over SCSI transports.
> 
> In 2.6 it sets PF_IOTHREAD.  I don't know if that subsumes the function of 
> PF_MEMALLOC or not.  The state of kerneldoc for much of the Linux core 
> functionality is shocking.

Core scsi assumes that scsi drivers will use scsi_malloc/free so really
ignores the issue as someone elses problem.


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