linux-kernel - Re: [PATCH] [MMC] Use own work queue

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Date:	Sun, 15 Oct 2006 11:40:31 +0200
From:	"pHilipp Zabel" <philipp.zabel@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [MMC] Use own work queue

On 10/13/06, Russell King <rmk+lkml@....linux.org.uk> wrote:
> On Mon, Oct 09, 2006 at 11:04:59PM +0200, Pierre Ossman wrote:
> > pHilipp Zabel wrote:
> > >
> > > This patch makes pxamci stop working for me on a HTC Magician (PXA272).
> > > Switching from 2.6.18 to 2.6.19-rc1 I got a kernel panic:
> > >
> > > mmc0: clock 0Hz busmode 1 powermode 0 cs 0  Vdd 0 width 0
> > > PXAMCI: clkrt = 0 cmdat = 0
> > > VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0)
> > > Please append a correct "root=" boot option
> > > Kernel panic - not syncing: VFS: Unable to mount root fs on
> > > unknown-block(0,0)
> > >
> > > After removing this patch from 2.6.19-rc1, everything is working again.
> > > Are there any changes to pxamci.c needed to be compatible with it?
> > >
> >
> > No, the drivers shouldn't be affected. As this is a root device, my
> > guess would be that you have a race in your bootup that is causing problem.
>
> The problem is likely that the boot is continuing in parallel with
> detecting the card, because the card detection is running in its own
> separate thread.  Meanwhile, the init thread is trying to read from
> the as-yet missing root device and erroring out.

Thanks, I can work around this by using the rootdelay kernel parameter.
So does that mean this is the expected behavior, or should I do anything
in the bootup sequence to make the init process wait for mmc detection?

regards
Philipp
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