From e5c89fb9004c17bde4c80450bd0307c65ad302d8 Mon Sep 17 00:00:00 2001 From: Thomas Taranowski 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 Cc: Alexandre Bounine Cc: Kumar Gala Cc: Matt Porter Cc: Li Yang Cc: Thomas Moll Cc: Micha Nelissen Cc: Benjamin Herrenschmidt Cc: Grant Likely Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- 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 3017532319c8..b7f02a484e54 100644 --- a/arch/powerpc/sysdev/fsl_rio.c +++ b/arch/powerpc/sysdev/fsl_rio.c @@ -954,7 +954,6 @@ 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