Change the sg loading rule back to using modprobe

kmod is too fast and then sg races with sd, causing the latter to not see SCSI disks.

Closes: #752591, #752605

debian/changelog

+systemd (204-12) UNRELEASED; urgency=medium
+
+  * Change the sg loading rule (for Debian #657948) back to using modprobe.
+    kmod is too fast and then sg races with sd, causing the latter to not see
+    SCSI disks.  (Closes: #752591, #752605)
+
+ -- Martin Pitt <mpitt@debian.org>  Wed, 25 Jun 2014 10:22:33 +0200
+
 systemd (204-11) unstable; urgency=medium
 
   [ Martin Pitt ]

debian/patches/Load-sg-module-from-80-drivers.rules.patch

@@ -5,6 +5,9 @@ Subject: Load sg module from 80-drivers.rules
 Taken from the Debian specific rules, this is the remaining difference over the
 upstream 80-drivers.rules.
 
+Note: DON'T use the kmod builtin here! It's too fast and then races with sd,
+causing the latter to not see SCSI disks. (https://bugs.debian.org/752591)
+
 Bug-Debian: http://bugs.debian.org/657948
 ---
  rules/80-drivers.rules | 1 +
@@ -18,6 +21,6 @@ index 50523e4..9222fb9 100644
  SUBSYSTEM=="i2o", RUN{builtin}="kmod load i2o_block"
  SUBSYSTEM=="module", KERNEL=="parport_pc", RUN{builtin}="kmod load ppdev"
  KERNEL=="mtd*ro", ENV{MTD_FTL}=="smartmedia", RUN{builtin}="kmod load sm_ftl"
-+SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_device", TEST!="[module/sg]", RUN{builtin}="kmod load sg"
++SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_device", TEST!="[module/sg]", RUN+="/sbin/modprobe -b sg"
  
  LABEL="drivers_end"