[PATCH] powerpc/xive: Fix missing check of rc != OPAL_BUSY

[Michael Ellerman]

Dan Carpenter noticed that the code in __xive_native_disable_queue() has a for
loop with an unconditional break in the middle, which doesn't make a lot of
sense.

What the code's supposed to do is loop as long as OPAL says it's busy, if we get
any other return code, either success or failure, then we should break the loop.

So add the missing check.

Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller")
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/sysdev/xive/native.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c
index 5fae59186cb2..1a726229a427 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -180,6 +180,7 @@ static void __xive_native_disable_queue(u32 vp_id, struct xive_q *q, u8 prio)
 	/* Disable the queue in HW */
 	for (;;) {
 		rc = opal_xive_set_queue_info(vp_id, prio, 0, 0, 0);
+		if (rc != OPAL_BUSY)
 			break;
 		msleep(1);
 	}
-- 
2.7.4