[PATCH v3 10/16] arm_mpam: propagate MSC write errors for ESR and part_sel wrappers

[Andre Przywara <andre.przywara@arm.com>]

Allow the wrapper functions for part_sel and ESR accesses to return an
error, and propagate write errors from the lower level up.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/resctrl/mpam_devices.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index f1e40ce24f5a..5a9760372666 100644
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -288,12 +288,13 @@ static int mpam_msc_clear_esr(struct mpam_msc *msc)
 	 * lower half prevent hardware from updating either half of the
 	 * register.
 	 */
-	if (msc->has_extd_esr)
-		__mpam_write_reg(msc, MPAMF_ESR + 4, 0);
-
-	__mpam_write_reg(msc, MPAMF_ESR, 0);
+	if (msc->has_extd_esr) {
+		ret = __mpam_write_reg(msc, MPAMF_ESR + 4, 0);
+		if (ret)
+			return ret;
+	}
 
-	return 0;
+	return __mpam_write_reg(msc, MPAMF_ESR, 0);
 }
 
 static int mpam_msc_read_esr(struct mpam_msc *msc, u64 *res)
@@ -316,28 +317,28 @@ static int mpam_msc_read_esr(struct mpam_msc *msc, u64 *res)
 	return 0;
 }
 
-static void __mpam_part_sel_raw(u32 partsel, struct mpam_msc *msc)
+static int __mpam_part_sel_raw(u32 partsel, struct mpam_msc *msc)
 {
 	lockdep_assert_held(&msc->part_sel_lock);
 
-	mpam_write_partsel_reg(msc, PART_SEL, partsel);
+	return mpam_write_partsel_reg(msc, PART_SEL, partsel);
 }
 
-static void __mpam_part_sel(u8 ris_idx, u16 partid, struct mpam_msc *msc)
+static int __mpam_part_sel(u8 ris_idx, u16 partid, struct mpam_msc *msc)
 {
 	u32 partsel = FIELD_PREP(MPAMCFG_PART_SEL_RIS, ris_idx) |
 		      FIELD_PREP(MPAMCFG_PART_SEL_PARTID_SEL, partid);
 
-	__mpam_part_sel_raw(partsel, msc);
+	return __mpam_part_sel_raw(partsel, msc);
 }
 
-static void __mpam_intpart_sel(u8 ris_idx, u16 intpartid, struct mpam_msc *msc)
+static int __mpam_intpart_sel(u8 ris_idx, u16 intpartid, struct mpam_msc *msc)
 {
 	u32 partsel = FIELD_PREP(MPAMCFG_PART_SEL_RIS, ris_idx) |
 		      FIELD_PREP(MPAMCFG_PART_SEL_PARTID_SEL, intpartid) |
 		      MPAMCFG_PART_SEL_INTERNAL;
 
-	__mpam_part_sel_raw(partsel, msc);
+	return __mpam_part_sel_raw(partsel, msc);
 }
 
 int mpam_register_requestor(u16 partid_max, u8 pmg_max)
-- 
2.43.0