[PATCH] mei: Add error logging in IRQ handler to prevent silent failures

[Wentao Liang]

Log mei_irq_write_handler() errors to prevent silent IRQ handling failures.

Fixes: 962ff7bcec24 ("mei: replace callback structures used as list head by list_head")
Cc: stable@xxxxxxxxxxxxxxx # 4.11+
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/misc/mei/hw-me.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index d11a0740b47c..5df42a64b4db 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -1415,6 +1415,8 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
 	if (dev->pg_event != MEI_PG_EVENT_WAIT &&
 	    dev->pg_event != MEI_PG_EVENT_RECEIVED) {
 		rets = mei_irq_write_handler(dev, &cmpl_list);
+		if (rets)
+			dev_err(dev->dev, "mei_irq_write_handler ret = %d.\n", rets);
 		dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 	}
 
-- 
2.42.0.windows.2