From: Bart Van Assche bvanassche@acm.org
[ 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@micron.com Cc: Can Guo cang@codeaurora.org Cc: Avri Altman avri.altman@wdc.com Cc: Stanley Chu stanley.chu@mediatek.com Cc: Tomas Winkler tomas.winkler@intel.com Link: https://lore.kernel.org/r/20191224220248.30138-5-bvanassche@acm.org Reviewed-by: Alim Akhtar alim.akhtar@samsung.com Signed-off-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 faf1959981784..b2cbdd01ab10b 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1910,12 +1910,12 @@ 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"); }
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