From 609c53245412e6a93dcbe1c59d735e7d4ce12d03 Mon Sep 17 00:00:00 2001
From: Thomas Taranowski <tom@baringforge.com>
Date: Wed, 12 Jan 2011 17:00:44 -0800
Subject: [PATCH] rapidio: fix hang on RapidIO doorbell queue full condition

commit 12a4dc43911785f51a596f771ae0701b18d436f1 upstream.

In fsl_rio_dbell_handler() the code currently simply acknowledges the QFI
queue full interrupt, but does nothing to resolve the queue full
condition.  Instead, it jumps to the end of the isr.  When a queue full
condition occurs, the isr is then re-entered immediately and continually,
forever.

The fix is to just fall through and read out current doorbell entries.

Signed-off-by: Thomas Taranowski <tom@baringforge.com>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Thomas Moll <thomas.moll@sysgo.com>
Cc: Micha Nelissen <micha@neli.hopto.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/powerpc/sysdev/fsl_rio.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 71fba88f50db..2aa6c931a996 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -833,7 +833,6 @@ fsl_rio_dbell_handler(int irq, void *dev_instance)
 	if (dsr & DOORBELL_DSR_QFI) {
 		pr_info("RIO: doorbell queue full\n");
 		out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_QFI);
-		goto out;
 	}
 
 	/* XXX Need to check/dispatch until queue empty */
-- 
2.39.5