Re: waiting 10s before mounting root filesystem?
From: Andrew Morton (akpm_at_osdl.org)
Date: 12/31/04
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Date: Fri, 31 Dec 2004 03:42:57 -0800 To: Paulo Marques <pmarques@grupopie.com>
Paulo Marques <pmarques@grupopie.com> wrote:
>
> Andrew Morton wrote:
> > William Park <opengeometry@yahoo.ca> wrote:
> >
> >>- printk("VFS: Cannot open root device \"%s\" or %s\n",
> >> - root_device_name, b);
> >> - printk("Please append a correct \"root=\" boot option\n");
> >> + if (--tryagain) {
> >> + printk (KERN_WARNING "VFS: Waiting %dsec for root device...\n", tryagain);
> >> + ssleep (1);
> >> + goto retry;
> >> + }
> >> + printk (KERN_CRIT "VFS: Cannot open root device \"%s\" or %s\n", root_device_name, b);
> >> + printk (KERN_CRIT "Please append a correct \"root=\" boot option\n");
> >
> >
> > Why is this patch needed? If it is to offer the user a chance to insert
> > the correct medium or to connect the correct device, why not rely upon the
> > user doing that thing and then hitting reset?
>
> No, no. The problem is not user interaction.
>
> The problem is that the USB subsystem takes a lot of time to go through
> the hostcontrollers -> hubs -> devices. By the time it finds the USB
> mass storage that is supposed to be used as root filesystem, the kernel
> had already panic'ed.
That would be a USB bug, surely. If /dev/usb/foo is present and
functioning correctly, and higher-level code tries to access that device,
USB should _not_ error out - it should block the caller until everything is
sorted out.
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- Previous message: Andrew Morton: "Re: waiting 10s before mounting root filesystem?"
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