Re: [PATCH] add help to WAIT_SCAN option

["Thibaut VARENE" <T-Bone@parisc-linux.org>]

On 5/26/07, Matthew Wilcox <matthew@wil.cx> wrote:
> On Sat, May 26, 2007 at 01:11:27PM -0600, Grant Grundler wrote:
> > Thibaut Varene's parisc box didn't find the root disk.
> > Problem is he had ASYNC_SCAN enabled and the required SYM2 driver builtin
> > but the root disk wasn't discovered before the kernel wanted to mount root.
> > Oh, and he (like many folks who build their own kernels) didn't use
> > an initrd or initramfs. So no chance to load scsi_wait_scan module.
>
> I don't know what Thibaut's problem was, but this explanation is
> definitely incorrect.  If you build in the sym2 driver and the scsi
> core, then we wait for the discs to be discovered automatically.

My problem was that:
- I use a standalone kernel (no init{rd,ramfs})
- I have CONFIG_MODULES=y
- I build all my (needed) scsi drivers 'y' (builtin)

Yet CONFIG_SCSI_WAIT_SCAN defaults to 'm' with no possibility of
setting it otherwise. So I ended up with a kernel with builtin async
scsi scan and no wait_scan, thus not waiting for the probes to
complete before trying to mount rootfs...

Editing KConfig to allow setting CONFIG_SCSI_WAIT_SCAN=y "fixed" the problem.

HTH

T-Bone

-- 
Thibaut VARENE
http://www.parisc-linux.org/~varenet/