From: Bart Van Assche <bvanassche@xxxxxxx> [ Upstream commit eacf36f5bebde5089dddb3d5bfcbeab530b01f8a ] Starting execution of a command before tracing a command may cause the completion handler to free data while it is being traced. Fix this race by tracing a command before it is submitted. Cc: Bean Huo <beanhuo@xxxxxxxxxx> Cc: Can Guo <cang@xxxxxxxxxxxxxx> Cc: Avri Altman <avri.altman@xxxxxxx> Cc: Stanley Chu <stanley.chu@xxxxxxxxxxxx> Cc: Tomas Winkler <tomas.winkler@xxxxxxxxx> Link: https://lore.kernel.org/r/20191224220248.30138-5-bvanassche@xxxxxxx Reviewed-by: Alim Akhtar <alim.akhtar@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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 020a93a40a982..d538b3d4f74a5 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1888,12 +1888,12 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag) { hba->lrb[task_tag].issue_time_stamp = ktime_get(); hba->lrb[task_tag].compl_time_stamp = ktime_set(0, 0); + ufshcd_add_command_trace(hba, task_tag, "send"); ufshcd_clk_scaling_start_busy(hba); __set_bit(task_tag, &hba->outstanding_reqs); ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL); /* Make sure that doorbell is committed immediately */ wmb(); - ufshcd_add_command_trace(hba, task_tag, "send"); } /** -- 2.25.1
