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drbd: Do not BUG() when connection breaks in a special way 

When a 'cluster wide' disconnect executes, the result comes back
from the peer, and immediately after that the connection breaks
then _conn_rq_cond() reported back SS_CW_SUCCESS.
Therefore _conn_request_state() calls conn_set_state(), which
has a BUG() in it.
The BUG() is hit because conn_is_valid_transition() does not like
the transaction. Which goes back to is_valid_soft_transition()
returning SS_OUTDATE_WO_CONN.

This fix is to consider an error reported by is_valid_soft_transition()
even when the peer agreed to the transaction.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Philipp Reisner 2014-04-28 18:43:20 +02:00 committed by Jens Axboe
parent e829987433
commit 88ea685d33
1 changed files with 7 additions and 7 deletions
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14
drivers/block/drbd/drbd_state.c
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@ -1765,19 +1765,19 @@ conn_set_state(struct drbd_connection *connection, union drbd_state mask, union
static enum drbd_state_rv
_conn_rq_cond(struct drbd_connection *connection, union drbd_state mask, union drbd_state val)
{
enum drbd_state_rv rv;
enum drbd_state_rv err, rv = SS_UNKNOWN_ERROR; /* continue waiting */;
if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &connection->flags))
return SS_CW_SUCCESS;
rv = SS_CW_SUCCESS;
if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &connection->flags))
return SS_CW_FAILED_BY_PEER;
rv = conn_is_valid_transition(connection, mask, val, 0);
if (rv == SS_SUCCESS && connection->cstate == C_WF_REPORT_PARAMS)
rv = SS_UNKNOWN_ERROR; /* continue waiting */
rv = SS_CW_FAILED_BY_PEER;
err = conn_is_valid_transition(connection, mask, val, 0);
if (err == SS_SUCCESS && connection->cstate == C_WF_REPORT_PARAMS)
return rv;
return err;
}
enum drbd_state_rv