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    Subject[34-longterm 139/179] powerpc/pseries/hvconsole: Fix dropped console output
    Date
    From: Anton Blanchard <anton@samba.org>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    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@samba.org>
    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    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;
    }

    --
    1.7.9.6


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