From: Bart Van Assche <bvanassche@xxxxxxx> [ Upstream commit 35c7d874f5993db04ce3aa310ae088f14b801eda ] Instead of documenting the locking requirements of the UIC code as comments, use lockdep_assert_held() such that lockdep verifies the lockdep requirements at runtime if lockdep is enabled. Link: https://lore.kernel.org/r/20210722033439.26550-8-bvanassche@xxxxxxx Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx> Cc: Stanley Chu <stanley.chu@xxxxxxxxxxxx> Cc: Can Guo <cang@xxxxxxxxxxxxxx> Cc: Asutosh Das <asutoshd@xxxxxxxxxxxxxx> Reviewed-by: Avri Altman <avri.altman@xxxxxxx> Reviewed-by: Bean Huo <beanhuo@xxxxxxxxxx> Reviewed-by: Daejun Park <daejun7.park@xxxxxxxxxxx> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/scsi/ufs/ufshcd.c | 16 +++++++++------- drivers/scsi/ufs/ufshcd.h | 2 +- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 0429ba5d7d23..f8d0fe6cb09d 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1986,15 +1986,15 @@ static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba) } /** - * ufshcd_dispatch_uic_cmd - Dispatch UIC commands to unipro layers + * ufshcd_dispatch_uic_cmd - Dispatch an UIC command to the Unipro layer * @hba: per adapter instance * @uic_cmd: UIC command - * - * Mutex must be held. */ static inline void ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd) { + lockdep_assert_held(&hba->uic_cmd_mutex); + WARN_ON(hba->active_uic_cmd); hba->active_uic_cmd = uic_cmd; @@ -2010,11 +2010,10 @@ ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd) } /** - * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command + * ufshcd_wait_for_uic_cmd - Wait for completion of an UIC command * @hba: per adapter instance * @uic_cmd: UIC command * - * Must be called with mutex held. * Returns 0 only if success. */ static int @@ -2023,6 +2022,8 @@ ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd) int ret; unsigned long flags; + lockdep_assert_held(&hba->uic_cmd_mutex); + if (wait_for_completion_timeout(&uic_cmd->done, msecs_to_jiffies(UIC_CMD_TIMEOUT))) ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT; @@ -2042,14 +2043,15 @@ ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd) * @uic_cmd: UIC command * @completion: initialize the completion only if this is set to true * - * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called - * with mutex held and host_lock locked. * Returns 0 only if success. */ static int __ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd, bool completion) { + lockdep_assert_held(&hba->uic_cmd_mutex); + lockdep_assert_held(hba->host->host_lock); + if (!ufshcd_ready_for_uic_cmd(hba)) { dev_err(hba->dev, "Controller not ready to accept UIC commands\n"); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 92ef6e6a3e51..803a2a37875b 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -493,7 +493,7 @@ struct ufs_stats { * @priv: pointer to variant specific private data * @irq: Irq number of the controller * @active_uic_cmd: handle of active UIC command - * @uic_cmd_mutex: mutex for uic command + * @uic_cmd_mutex: mutex for UIC command * @tmf_tag_set: TMF tag set. * @tmf_queue: Used to allocate TMF tags. * @pwr_done: completion for power mode change -- 2.30.2
