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McKenney" , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Joel Fernandes , linux-kernel-mentees@lists.linuxfoundation.org Subject: [Linux-kernel-mentees] [PATCH] drivers: soc: ti: knav_qmss_queue: Pass lockdep expression to RCU lists X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" inst->handles is traversed using list_for_each_entry_rcu outside an RCU read-side critical section but under the protection of knav_dev_lock. Hence, add corresponding lockdep expression to silence false-positive lockdep warnings, and harden RCU lists. Add macro for the corresponding lockdep expression to make the code clean and concise. Signed-off-by: Amol Grover --- drivers/soc/ti/knav_qmss_queue.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c index 1ccc9064e1eb..888dc091c63b 100644 --- a/drivers/soc/ti/knav_qmss_queue.c +++ b/drivers/soc/ti/knav_qmss_queue.c @@ -25,6 +25,8 @@ static struct knav_device *kdev; static DEFINE_MUTEX(knav_dev_lock); +#define knav_dev_lock_held() \ + lockdep_is_held(&knav_dev_lock) /* Queue manager register indices in DTS */ #define KNAV_QUEUE_PEEK_REG_INDEX 0 @@ -52,8 +54,9 @@ static DEFINE_MUTEX(knav_dev_lock); #define knav_queue_idx_to_inst(kdev, idx) \ (kdev->instances + (idx << kdev->inst_shift)) -#define for_each_handle_rcu(qh, inst) \ - list_for_each_entry_rcu(qh, &inst->handles, list) +#define for_each_handle_rcu(qh, inst) \ + list_for_each_entry_rcu(qh, &inst->handles, list, \ + rcu_read_lock_held() || knav_dev_lock_held()) #define for_each_instance(idx, inst, kdev) \ for (idx = 0, inst = kdev->instances; \ -- 2.24.1 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees