diff options
Diffstat (limited to 'drivers/slimbus')
| -rw-r--r-- | drivers/slimbus/messaging.c | 74 | ||||
| -rw-r--r-- | drivers/slimbus/slimbus.h | 2 |
2 files changed, 54 insertions, 22 deletions
diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c index e3605ed1c459..d5879142dbef 100644 --- a/drivers/slimbus/messaging.c +++ b/drivers/slimbus/messaging.c @@ -29,22 +29,19 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len) spin_lock_irqsave(&ctrl->txn_lock, flags); txn = idr_find(&ctrl->tid_idr, tid); - if (txn == NULL) { - spin_unlock_irqrestore(&ctrl->txn_lock, flags); + spin_unlock_irqrestore(&ctrl->txn_lock, flags); + + if (txn == NULL) return; - } msg = txn->msg; if (msg == NULL || msg->rbuf == NULL) { dev_err(ctrl->dev, "Got response to invalid TID:%d, len:%d\n", tid, len); - spin_unlock_irqrestore(&ctrl->txn_lock, flags); return; } - idr_remove(&ctrl->tid_idr, tid); - spin_unlock_irqrestore(&ctrl->txn_lock, flags); - + slim_free_txn_tid(ctrl, txn); memcpy(msg->rbuf, reply, len); if (txn->comp) complete(txn->comp); @@ -56,6 +53,48 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len) EXPORT_SYMBOL_GPL(slim_msg_response); /** + * slim_alloc_txn_tid() - Allocate a tid to txn + * + * @ctrl: Controller handle + * @txn: transaction to be allocated with tid. + * + * Return: zero on success with valid txn->tid and error code on failures. + */ +int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&ctrl->txn_lock, flags); + ret = idr_alloc_cyclic(&ctrl->tid_idr, txn, 0, + SLIM_MAX_TIDS, GFP_ATOMIC); + if (ret < 0) { + spin_unlock_irqrestore(&ctrl->txn_lock, flags); + return ret; + } + txn->tid = ret; + spin_unlock_irqrestore(&ctrl->txn_lock, flags); + return 0; +} +EXPORT_SYMBOL_GPL(slim_alloc_txn_tid); + +/** + * slim_free_txn_tid() - Freee tid of txn + * + * @ctrl: Controller handle + * @txn: transaction whose tid should be freed + */ +void slim_free_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn) +{ + unsigned long flags; + + spin_lock_irqsave(&ctrl->txn_lock, flags); + idr_remove(&ctrl->tid_idr, txn->tid); + spin_unlock_irqrestore(&ctrl->txn_lock, flags); +} +EXPORT_SYMBOL_GPL(slim_free_txn_tid); + +/** * slim_do_transfer() - Process a SLIMbus-messaging transaction * * @ctrl: Controller handle @@ -72,8 +111,7 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn) { DECLARE_COMPLETION_ONSTACK(done); bool need_tid = false, clk_pause_msg = false; - unsigned long flags; - int ret, tid, timeout; + int ret, timeout; /* * do not vote for runtime-PM if the transactions are part of clock @@ -97,34 +135,26 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn) need_tid = slim_tid_txn(txn->mt, txn->mc); if (need_tid) { - spin_lock_irqsave(&ctrl->txn_lock, flags); - tid = idr_alloc(&ctrl->tid_idr, txn, 0, - SLIM_MAX_TIDS, GFP_ATOMIC); - txn->tid = tid; + ret = slim_alloc_txn_tid(ctrl, txn); + if (ret) + return ret; if (!txn->msg->comp) txn->comp = &done; else txn->comp = txn->comp; - - spin_unlock_irqrestore(&ctrl->txn_lock, flags); - - if (tid < 0) - return tid; } ret = ctrl->xfer_msg(ctrl, txn); - if (ret && need_tid && !txn->msg->comp) { + if (!ret && need_tid && !txn->msg->comp) { unsigned long ms = txn->rl + HZ; timeout = wait_for_completion_timeout(txn->comp, msecs_to_jiffies(ms)); if (!timeout) { ret = -ETIMEDOUT; - spin_lock_irqsave(&ctrl->txn_lock, flags); - idr_remove(&ctrl->tid_idr, tid); - spin_unlock_irqrestore(&ctrl->txn_lock, flags); + slim_free_txn_tid(ctrl, txn); } } diff --git a/drivers/slimbus/slimbus.h b/drivers/slimbus/slimbus.h index 79f8e05d92dd..2ba6545fa716 100644 --- a/drivers/slimbus/slimbus.h +++ b/drivers/slimbus/slimbus.h @@ -240,6 +240,8 @@ int slim_unregister_controller(struct slim_controller *ctrl); void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 l); int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn); int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart); +int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn); +void slim_free_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn); static inline bool slim_tid_txn(u8 mt, u8 mc) { |