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SubjectRe: [PATCH] ipmi: Increase KCS timeouts
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On Wed, Nov 30, 2011 at 02:12:27PM -0500, Matthew Garrett wrote:
> We currently time out and retry KCS transactions after 1 second of waiting
> for IBF or OBF. This appears to be too short for some hardware. The IPMI
> spec says "All system software wait loops should include error timeouts. For
> simplicity, such timeouts are not shown explicitly in the flow diagrams. A
> five-second timeout or greater is recommended". Change the timeout to five
> seconds to satisfy the slow hardware.
>
> Signed-off-by: Matthew Garrett <mjg@redhat.com>
> ---
> drivers/char/ipmi/ipmi_kcs_sm.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_kcs_sm.c b/drivers/char/ipmi/ipmi_kcs_sm.c
> index cf82fed..e53fc24 100644
> --- a/drivers/char/ipmi/ipmi_kcs_sm.c
> +++ b/drivers/char/ipmi/ipmi_kcs_sm.c
> @@ -118,8 +118,8 @@ enum kcs_states {
> #define MAX_KCS_WRITE_SIZE IPMI_MAX_MSG_LENGTH
>
> /* Timeouts in microseconds. */
> -#define IBF_RETRY_TIMEOUT 1000000
> -#define OBF_RETRY_TIMEOUT 1000000
> +#define IBF_RETRY_TIMEOUT 5000000
> +#define OBF_RETRY_TIMEOUT 5000000
> #define MAX_ERROR_RETRIES 10
> #define ERROR0_OBF_WAIT_JIFFIES (2*HZ)
>
> --
> 1.7.7.1
>
>
--
Matthew Garrett | mjg59@srcf.ucam.org


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