[34-longterm 139/179] powerpc/pseries/hvconsole: Fix dropped console output

From: Paul Gortmaker
Date: Mon May 14 2012 - 22:36:44 EST

From: Anton Blanchard <anton@xxxxxxxxx>

This is a commit scheduled for the next v2.6.34 longterm release.
If you see a problem with using this for longterm, please comment.

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@xxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
arch/powerpc/platforms/pseries/hvconsole.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hvconsole.c b/arch/powerpc/platforms/pseries/hvconsole.c
index 3f6a89b..041e87c 100644
--- 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, const char *buf, int count)
if (ret == H_SUCCESS)
return count;
if (ret == H_BUSY)
- return 0;
+ return -EAGAIN;
return -EIO;


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