scsi: ufs: core: Exclude UECxx from SFR dump list

[ Upstream commit 3e8a78cd5fdfcf2e81d3b3ac02099923342a34cd ]

Some devices may return invalid or zeroed data during an UIC error
condition. In addition, reading these SFRs will clear them. This means the
subsequent error handling will not be able to see them and therefore no
error handling will be scheduled.

Skip reading these SFRs in ufshcd_dump_regs().

Link: https://lore.kernel.org/r/1648689845-33521-1-git-send-email-kwmad.kim@samsung.com
Fixes: adcbce1749bd ("scsi: ufs: Use explicit access size in ufshcd_dump_regs")
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b55e0a07363f23259e7221c9f18deae0e0539934..5c9a31f18b7f081c0e6d3d7808f4d1ba5e20f936 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -112,8 +112,13 @@ 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 (offset == 0 &&
+                   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);