[PATCH] ipmi: kcs error0 delay

BMCs can get into ERROR0 state while flashing new firmware, particularly while
the BMC is erasing the next flash block, which may take a just under 2 seconds
on a Dell PowerEdge 2800 (1.75 seconds typical), during which time the
single-threaded firmware may not be able to process new commands.  In
particular, clearing OBF may not take effect immediately.

We want it to delay in ERROR0 after clearing OBF a bit waiting for OBF to
actually be clear before proceeding.

This introduces a new return value from the LLDD's event loop,
SI_SM_CALL_WITH_TICK_DELAY.  This means the calling thread/timer should
schedule_timeout() at least 1 tick, rather than busy-wait.  This is a longer
delay than SI_SM_CALL_WITH_DELAY, which is typically a 250us busy-wait.

Signed-off-by: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/char/ipmi/ipmi_si_sm.h b/drivers/char/ipmi/ipmi_si_sm.h
index 62791dd42985..bf3d4962d6a5 100644
--- a/drivers/char/ipmi/ipmi_si_sm.h
+++ b/drivers/char/ipmi/ipmi_si_sm.h
@@ -62,6 +62,7 @@ enum si_sm_result
 {
         SI_SM_CALL_WITHOUT_DELAY, /* Call the driver again immediately */
         SI_SM_CALL_WITH_DELAY,  /* Delay some before calling again. */
+        SI_SM_CALL_WITH_TICK_DELAY,     /* Delay at least 1 tick before calling again. */
         SI_SM_TRANSACTION_COMPLETE, /* A transaction is finished. */
         SI_SM_IDLE,             /* The SM is in idle state. */
         SI_SM_HOSED,            /* The hardware violated the state machine. */