[lkml]   [2007]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: SCSI breakage on non-cache coherent architectures

On Mon, 2007-11-19 at 05:32 -0700, Matthew Wilcox wrote:
> On Mon, Nov 19, 2007 at 04:35:23PM +1100, Benjamin Herrenschmidt wrote:
> > The other one I'm hitting now is that the SCSI layer nowadays embeds the
> 'nowadays'? It has always been so.

Wasn't it kmalloc'ed at one point ?

> > sense_buffer inside the scsi_cmnd structure without any kind of
> > alignment whatsoever. I've been hitting irregulary is a crash on SCSI command
> > completion that seems to be related to corruption of the "request"
> > pointer in struct scsi_cmnd and I think it might be the cause.
> > I'm now trying to setup a proper repro-case.
> What other drivers do is DMA to their own allocation and then memcpy to
> the sense buffer.

What "other drivers" ? Those architectures use the same drivers as
everything else.

> There is a movement to allocate the sense data as its own sg list, but
> I don't think that patch has even been posted yet.

I've seen code creating an sglist from the scsi_cmnd->sense_buffer and
passing that to drivers. That breaks.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-11-19 20:55    [W:0.253 / U:1.208 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site