linux-kernel - [PATCH] [14/50] powerpc/pseries/hvconsole: Fix dropped console output

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Message-Id: <20110728234418.8B7182403FF@tassilo.jf.intel.com>
Date:	Thu, 28 Jul 2011 16:44:18 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	anton@...ba.org, benh@...nel.crashing.org, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [14/50] powerpc/pseries/hvconsole: Fix dropped console output

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Anton Blanchard <anton@...ba.org>

[ upstream commit 51d33021425e1f905beb4208823146f2fb6517da ]

Return -EAGAIN when we get H_BUSY back from the hypervisor. This
makes the hvc console driver retry, avoiding dropped printks.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Cc: <stable@...nel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Index: linux-2.6.35.y/arch/powerpc/platforms/pseries/hvconsole.c
===================================================================
--- linux-2.6.35.y.orig/arch/powerpc/platforms/pseries/hvconsole.c
+++ linux-2.6.35.y/arch/powerpc/platforms/pseries/hvconsole.c
@@ -73,7 +73,7 @@ int hvc_put_chars(uint32_t vtermno, cons
 	if (ret == H_SUCCESS)
 		return count;
 	if (ret == H_BUSY)
-		return 0;
+		return -EAGAIN;
 	return -EIO;
 }
 
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