[PATCH 4.19 314/421] pinctrl: mcp23s08: Fix missing unlock on error in mcp23s08_irq()

[Greg Kroah-Hartman]

From: Zou Wei <zou_wei@xxxxxxxxxx>

commit 884af72c90016cfccd5717439c86b48702cbf184 upstream.

Add the missing unlock before return from function mcp23s08_irq()
in the error handling case.

v1-->v2:
   remove the "return IRQ_HANDLED" line

Fixes: 897120d41e7a ("pinctrl: mcp23s08: fix race condition in irq handler")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Zou Wei <zou_wei@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1623134048-56051-1-git-send-email-zou_wei@xxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-mcp23s08.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -460,7 +460,7 @@ static irqreturn_t mcp23s08_irq(int irq,
 
 	if (intf == 0) {
 		/* There is no interrupt pending */
-		return IRQ_HANDLED;
+		goto unlock;
 	}
 
 	if (mcp_read(mcp, MCP_INTCAP, &intcap))