[Skiboot] [PATCH] opal-prd: Add RestartSec to service script

[Vasant Hegde]

We are seeing random failure of `opal-prd` during boot. Its failing during
boot mostly because prd module is not yet loaded.

Sample failure message:
----------------------
Feb 21 19:03:09 grsp1 opal-prd: FW: Can't open PRD device /dev/opal-prd: No such file or directory
Feb 21 19:03:09 grsp1 opal-prd: FW: Error initialising PRD channel

We have `Restart` option in service script. But systemd will attempt to
restart as soon as it fails and stops after few attempts (by default it
retries for 5 times). This patch add `RestartSec` option to service script

RestartSec = Configures the time to sleep before restarting a service.

Note that I have pickedup 30sec as wait time. Before this change we hit
`opal-prd` failure within 50 reboots. With this fix 200 reboots went fine
without any failure.

Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
---
 external/opal-prd/opal-prd.service | 1 +
 1 file changed, 1 insertion(+)

diff --git a/external/opal-prd/opal-prd.service b/external/opal-prd/opal-prd.service
index dce0dd262..755b5f45c 100644
--- a/external/opal-prd/opal-prd.service
+++ b/external/opal-prd/opal-prd.service
@@ -6,6 +6,7 @@ ConditionPathExists=/sys/firmware/devicetree/base/ibm,opal/diagnostics
 [Service]
 ExecStart=/usr/sbin/opal-prd
 Restart=always
+RestartSec=30
 
 [Install]
 WantedBy=multi-user.target
-- 
2.21.1