RE: [Infiniband-access_layer] ib_dereg_mr fails

[Zilber E. <er...@te...>]

I'm trying to release the memory from a CQ callback function. This command
runs after running cl_spinlock_acquire.
However, this code was released as a part of the SF project code (SRP), so
I assumed that it should work fine...


On Thu, 27 May 2004, Fab Tillier wrote:

> You are probably holding a spinlock or are running in a tasklet context.
> Memory registration and deregistration has to be done in a thread context
> that is able to block.This is a limitation of the Mellanox HCA.
>
> - Fab
>
> > -----Original Message-----
> > From: er...@te... [mailto:er...@te....=
il]
> > Sent: Thursday, May 27, 2004 5:55 AM
> > To: inf...@li...
> > Subject: [Infiniband-access_layer] ib_dereg_mr fails
> >
> > Hi,
> >
> > I'm regsitering memory using ib_reg_mem (in order to allow another
> > application
> > to perform RDMA write). Later, I want to free this memory using
> > ib_dereg_mr. I
> > get the following errors:
> >
> > TVPD(1): THH_hob_deregister_mr: NOT IN TASK CONTEXT)
> > May 27 15:43:20 psl-178 kernel:TVPD(1): kvp_mlx_mrw.c[609]:
> > kvp_mlnx_deregister_mr: THH_hob_deregister_mr error (-255: HH_ERR)
> > May 27 15:43:20 psl-178 kernel: srpl_retire() !ERROR!: ib_dereg_mr()
> > failed !
> > status =3D 0x2a
> >
> > Why?
> >
> > Thanks
> > Erez
> >
> >
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