[PATCH v10 02/11] ufs: dwc: Return a negative error if the link is down

[Larisa Grigore <larisa.grigore@oss.nxp.com>]

ufshcd_dwc_link_is_up() returns 1 when the UniPro link is not up, and it
ignores the return value of ufshcd_dme_get(), so a failed read of
VS_POWERSTATE is also reported as "link down" with the value 1.

A subsequent patch exports this helper for use by other DWC glue
drivers. Before doing so, make it follow the usual kernel convention:
return -ENOLINK when the link is down, and report a failed
ufshcd_dme_get() as a negative errno instead of its positive UIC result.
Declare dme_result as u32 to match the ufshcd_dme_get() parameter type.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@oss.nxp.com>
---
 drivers/ufs/host/ufshcd-dwc.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/ufs/host/ufshcd-dwc.c b/drivers/ufs/host/ufshcd-dwc.c
index 21b1cf912dcc..71433b4d04aa 100644
--- a/drivers/ufs/host/ufshcd-dwc.c
+++ b/drivers/ufs/host/ufshcd-dwc.c
@@ -48,20 +48,23 @@ static void ufshcd_dwc_program_clk_div(struct ufs_hba *hba, u32 divider_val)
  * ufshcd_dwc_link_is_up() - check if link is up.
  * @hba: private structure pointer
  *
- * Return: 0 on success, non-zero value on failure.
+ * Return: 0 on success, a negative errno value on failure.
  */
 static int ufshcd_dwc_link_is_up(struct ufs_hba *hba)
 {
-	int dme_result = 0;
+	u32 dme_result = 0;
+	int ret;
 
-	ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result);
+	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result);
+	if (ret)
+		return ret > 0 ? -EIO : ret;
 
 	if (dme_result == UFSHCD_LINK_IS_UP) {
 		ufshcd_set_link_active(hba);
 		return 0;
 	}
 
-	return 1;
+	return -ENOLINK;
 }
 
 /**
-- 
2.43.0