linux-kernel - [39/55] powerpc/pseries/hvconsole: Fix dropped console output

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Message-Id: <20110806000252.787677814@clark.kroah.org>
Date:	Fri, 05 Aug 2011 17:02:09 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [39/55] powerpc/pseries/hvconsole: Fix dropped console output

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

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

commit 51d33021425e1f905beb4208823146f2fb6517da upstream.

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>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/powerpc/platforms/pseries/hvconsole.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/pseries/hvconsole.c
+++ b/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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