Re: sd_mod load is delayed.

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Sunday 29 January 2006 12:29, Hai Zaar wrote:
> Hi!
>
> I'm using 2.6.15 + udev 081 + udev rules from here:
> http://ftp.jg555.com/udev/udev-cross-lfs.tar.bz2 Relevant modprobe rules
> are: # hotplug
> ENV{MODALIAS}="?*",    RUN+="/sbin/modprobe $env{MODALIAS}"
>
> # scsi
> SUBSYSTEM="scsi_device",   ACTION="add", SYSFS{device/type}="1",
> SYSFS{device/vendor}="On[sS]tream", RUN+="/sbin/modprobe osst"
> SUBSYSTEM="scsi_device",   ACTION="add", SYSFS{device/type}="1",
> RUN+="/sbin/modprobe st"
> SUBSYSTEM="scsi_device",   ACTION="add", SYSFS{device/type}="[45]",
> RUN+="/sbin/modprobe sr_mod"
> SUBSYSTEM="scsi_device",   ACTION="add", RUN+="/sbin/modprobe sg"
>
> Those rules do not handle sd_mod loading, so I've added the following
> line from SUSE rules:
> SUBSYSTEM="scsi_device",   ACTION="add",
> SYSFS{device/type}="0|7|14", RUN+="/sbin/modprobe sd_mod"
>
> I have two storage controllers in my machine:
> 1. Intel SATA controller, handled by ata_piix driver.
> 2. LSI logic SCSI controller handled by mptlinux driver.
>
> The situation:
> During initramfs stage, if I trigger event only for SATA controller,
> then after just 1 second lib_ata and  ata_piix modules are loaded
> together with sd_mod and friends, and /proc/partitions is populated.
> So just after 1-2 seconds I'm able boot from SATA.
>
> When LSI logic event is triggered - mptlinux module is loaded and
> spends about half a minute to scan the bus.
>
> The problems with, that when I trigger events both for SATA and LSI
> logic (like trigger_all_events function does), sd_mod is not get
> loaded until _both_ SATA and LSI finish to initialize.
> Why sd_mod is not get loaded just right after ata_piix has finished?
>


As far as I can tell, SCSI subsystem is using scan mutex; so only one HBA can 
do scanning at a time. Or so it appears. May be LSI is the frst one to kick 
in.

- -andrey
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