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drbd: mutex_unlock "... must no be used in interrupt context"

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Documentation of mutex_unlock says
we must not use it in interrupt context.
So do not call it while holding the spin_lock_irq,
but give up the spinlock temporarily.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2012-08-22 16:15:26 +02:00 committed by Philipp Reisner
parent c1fd29a11f
commit c02abda2b2
1 changed files with 39 additions and 35 deletions
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74
drivers/block/drbd/drbd_state.c
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@ -1721,38 +1721,6 @@ _conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state
return rv;
}
static enum drbd_state_rv
conn_cl_wide(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
enum chg_state_flags f)
{
enum drbd_state_rv rv;
spin_unlock_irq(&tconn->req_lock);
mutex_lock(&tconn->cstate_mutex);
set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
if (conn_send_state_req(tconn, mask, val)) {
clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
/* if (f & CS_VERBOSE)
print_st_err(mdev, os, ns, rv); */
mutex_unlock(&tconn->cstate_mutex);
spin_lock_irq(&tconn->req_lock);
return SS_CW_FAILED_BY_PEER;
}
if (val.conn == C_DISCONNECTING)
set_bit(DISCONNECT_SENT, &tconn->flags);
spin_lock_irq(&tconn->req_lock);
wait_event_lock_irq(tconn->ping_wait, (rv = _conn_rq_cond(tconn, mask, val)), tconn->req_lock,);
clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
mutex_unlock(&tconn->cstate_mutex);
return rv;
}
enum drbd_state_rv
_conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
enum chg_state_flags flags)
@ -1761,6 +1729,7 @@ _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_
struct after_conn_state_chg_work *acscw;
enum drbd_conns oc = tconn->cstate;
union drbd_state ns_max, ns_min, os;
bool have_mutex = false;
rv = is_valid_conn_transition(oc, val.conn);
if (rv < SS_SUCCESS)
@ -1772,7 +1741,35 @@ _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_
if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
!(flags & (CS_LOCAL_ONLY | CS_HARD))) {
rv = conn_cl_wide(tconn, mask, val, flags);
/* This will be a cluster-wide state change.
* Need to give up the spinlock, grab the mutex,
* then send the state change request, ... */
spin_unlock_irq(&tconn->req_lock);
mutex_lock(&tconn->cstate_mutex);
have_mutex = true;
set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
if (conn_send_state_req(tconn, mask, val)) {
/* sending failed. */
clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
rv = SS_CW_FAILED_BY_PEER;
/* need to re-aquire the spin lock, though */
goto abort_unlocked;
}
if (val.conn == C_DISCONNECTING)
set_bit(DISCONNECT_SENT, &tconn->flags);
/* ... and re-aquire the spinlock.
* If _conn_rq_cond() returned >= SS_SUCCESS, we must call
* conn_set_state() within the same spinlock. */
spin_lock_irq(&tconn->req_lock);
wait_event_lock_irq(tconn->ping_wait,
(rv = _conn_rq_cond(tconn, mask, val)),
tconn->req_lock,
);
clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
if (rv < SS_SUCCESS)
goto abort;
}
@ -1796,9 +1793,16 @@ _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_
conn_err(tconn, "Could not kmalloc an acscw\n");
}
return rv;
abort:
if (flags & CS_VERBOSE) {
if (have_mutex) {
/* mutex_unlock() "... must not be used in interrupt context.",
* so give up the spinlock, then re-aquire it */
spin_unlock_irq(&tconn->req_lock);
abort_unlocked:
mutex_unlock(&tconn->cstate_mutex);
spin_lock_irq(&tconn->req_lock);
}
if (rv < SS_SUCCESS && flags & CS_VERBOSE) {
conn_err(tconn, "State change failed: %s\n", drbd_set_st_err_str(rv));
conn_err(tconn, " state = { cs:%s }\n", drbd_conn_str(oc));
conn_err(tconn, "wanted = { cs:%s }\n", drbd_conn_str(val.conn));