diff mbox series

[v1] scsi: ufs: exclude UECxx from SFR dump list

Message ID 1644577701-40884-1-git-send-email-kwmad.kim@samsung.com
State Superseded
Headers show
Series [v1] scsi: ufs: exclude UECxx from SFR dump list | expand

Commit Message

Kiwoong Kim Feb. 11, 2022, 11:08 a.m. UTC 
These are ROC type things that means their values
are cleared when the SFRs are read.
They are usually read in ISR when an UIC error occur.
Thus, their values would be zero at many cases. And
there might be a little bit risky when they are read to
be cleared before the ISR reads them, e.g. the case that
a command is timed-out, ufshcd_dump_regs is called in
ufshcd_abort and an UIC error occurs at the nearly
same time. In this case, ISR will be called but UFS error handler
will not be scheduled.
This patch is to make UFS driver not read those SFRs in the
dump function, i.e. ufshcd_dump_regs.

Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
---
 drivers/scsi/ufs/ufshcd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 460d2b4..8b65c081 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -115,8 +115,12 @@  int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
 	if (!regs)
 		return -ENOMEM;
 
-	for (pos = 0; pos < len; pos += 4)
+	for (pos = 0; pos < len; pos += 4) {
+		if (pos >= REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER	&&
+		    pos <= REG_UIC_ERROR_CODE_DME)
+			continue;
 		regs[pos / 4] = ufshcd_readl(hba, offset + pos);
+	}
 
 	ufshcd_hex_dump(prefix, regs, len);
 	kfree(regs);