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slimbus: messaging: start transaction ids from 1 instead of zero

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[ Upstream commit 9659281ce78de0f15a4aa124da8f7450b1399c09 ]

As tid is unsigned its hard to figure out if the tid is valid or
invalid. So Start the transaction ids from 1 instead of zero
so that we could differentiate between a valid tid and invalid tids

This is useful in cases where controller would add a tid for controller
specific transfers.

Fixes: d3062a2109 ("slimbus: messaging: add slim_alloc/free_txn_tid()")
Cc: <stable@vger.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210809082428.11236-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Srinivas Kandagatla 2021-08-09 09:24:25 +01:00 committed by Sasha Levin
parent bd0c2f83d0
commit b700b523dd
1 changed files with 1 additions and 1 deletions
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2
drivers/slimbus/messaging.c
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@ -66,7 +66,7 @@ int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn)
int ret = 0;
spin_lock_irqsave(&ctrl->txn_lock, flags);
ret = idr_alloc_cyclic(&ctrl->tid_idr, txn, 0,
ret = idr_alloc_cyclic(&ctrl->tid_idr, txn, 1,
SLIM_MAX_TIDS, GFP_ATOMIC);
if (ret < 0) {
spin_unlock_irqrestore(&ctrl->txn_lock, flags);