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drbd: Fix comparison of is_valid_transition()'s return code

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is_valid_transition() might return SS_NOTHING_TO_DO.

The condition function _req_st_cond() returned SS_NOTHING_TO_DO, which
caused the wait_event to abort too early. Therefore drbd_req_state()
did not consume the next CL_ST_CHG_SUCCESS or SS_CW_FAILED_BY_PEER
causing serve disruption of the state machine logic...

Detaching from a single volue was one way to trigger this bug.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2012-09-03 15:39:01 +02:00
parent 1393b59f8c
commit a3025a2737
1 changed files with 3 additions and 3 deletions
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6
drivers/block/drbd/drbd_state.c
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@ -277,16 +277,16 @@ _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
os = drbd_read_state(mdev); os = drbd_read_state(mdev);
ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
rv = is_valid_transition(os, ns); rv = is_valid_transition(os, ns);
if (rv == SS_SUCCESS) if (rv >= SS_SUCCESS)
rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
if (!cl_wide_st_chg(mdev, os, ns)) if (!cl_wide_st_chg(mdev, os, ns))
rv = SS_CW_NO_NEED; rv = SS_CW_NO_NEED;
if (rv == SS_UNKNOWN_ERROR) { if (rv == SS_UNKNOWN_ERROR) {
rv = is_valid_state(mdev, ns); rv = is_valid_state(mdev, ns);
if (rv == SS_SUCCESS) { if (rv >= SS_SUCCESS) {
rv = is_valid_soft_transition(os, ns, mdev->tconn); rv = is_valid_soft_transition(os, ns, mdev->tconn);
if (rv == SS_SUCCESS) if (rv >= SS_SUCCESS)
rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
} }
} }