[PATCH v10 01/11] ufs: core: Return a negative errno from WLUN suspend/resume

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

__ufshcd_wl_suspend() and __ufshcd_wl_resume() may return a positive result
code, e.g. from ufshcd_link_startup() when DME link startup fails while
restoring the link.

The runtime PM core treats any non-zero value as a failure of the WLUN,
but rpm_get_suppliers() only checks for a negative value. The LUs
consuming the WLUN are thus reported as resumed and receive I/O while
the WLUN is still suspended.

Convert positive values to -EIO, as ufshcd_init() already does.
Do the same in __ufshcd_wl_suspend() for consistency, so that callers
always get a negative errno.

Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
Signed-off-by: Larisa Grigore <larisa.grigore@oss.nxp.com>
---
 drivers/ufs/core/ufshcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ee643830a57a..d4addb7bdf7b 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -10545,7 +10545,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		ufshcd_release(hba);
 	}
 	hba->pm_op_in_progress = false;
-	return ret;
+	return ret > 0 ? -EIO : ret;
 }
 
 #ifdef CONFIG_PM
@@ -10646,7 +10646,7 @@ static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	hba->clk_gating.is_suspended = false;
 	ufshcd_release(hba);
 	hba->pm_op_in_progress = false;
-	return ret;
+	return ret > 0 ? -EIO : ret;
 }
 
 static int ufshcd_wl_runtime_suspend(struct device *dev)
-- 
2.43.0