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

Andi Kleen
2011-07-28T23:44:33Z

From: Anton Blanchard <anton@samba.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@samba.org>
Cc: <stable@kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andi Kleen <ak@linux.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;
}