I spotted an error in a patch posted this week, unfortunately just
after it got accepted. The effect of the bug is that time-based
interrupt moderation is disabled. This is not technically a bug,
but it is not what is intended. The problem is that a |= assignment
got implemented as a simple assignment, so the previously assigned
value was ignored.
Fixes: edc6158b18af ("net: ipa: define fields for event-ring related registers")
Signed-off-by: Alex Elder <elder@xxxxxxxxxx>
---
drivers/net/ipa/gsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index f44d2d843de12..05ea2502201da 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -762,7 +762,7 @@ static void gsi_evt_ring_program(struct gsi *gsi, u32 evt_ring_id)
/* Enable interrupt moderation by setting the moderation delay */
reg = gsi_reg(gsi, EV_CH_E_CNTXT_8);
val = reg_encode(reg, EV_MODT, GSI_EVT_RING_INT_MODT);
- val = reg_encode(reg, EV_MODC, 1); /* comes from channel */
+ val |= reg_encode(reg, EV_MODC, 1); /* comes from channel */
/* EV_MOD_CNT is 0 (no counter-based interrupt coalescing) */
iowrite32(val, gsi->virt + reg_n_offset(reg, evt_ring_id));
--
2.34.1
