3.16.44-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> commit e1c0d82dab4a4605d3bd1968436f030dfed4a829 upstream. Most of the retries can be done within a millisecond successfully, so we sleep 1ms before the first retry, then gradually increase the retry interval to 2^n with max value of 2048ms. Doing so, we will have shorter overall delay time, because most of the cases succeed within 1-2 attempts. Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Reviewed-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- drivers/hv/connection.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -418,6 +418,7 @@ int vmbus_post_msg(void *buffer, size_t union hv_connection_id conn_id; int ret = 0; int retries = 0; + u32 msec = 1; conn_id.asu32 = 0; conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID; @@ -427,7 +428,7 @@ int vmbus_post_msg(void *buffer, size_t * insufficient resources. Retry the operation a couple of * times before giving up. */ - while (retries < 10) { + while (retries < 20) { ret = hv_post_message(conn_id, 1, buffer, buflen); switch (ret) { @@ -450,7 +451,9 @@ int vmbus_post_msg(void *buffer, size_t } retries++; - msleep(1000); + msleep(msec); + if (msec < 2048) + msec *= 2; } return ret; }