From: Michael Ellerman Date: Thu, 20 Apr 2017 04:43:19 +0000 (+1000) Subject: powerpc/xive: Fix missing check of rc != OPAL_BUSY X-Git-Tag: v4.12-rc1~93^2~67 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=686978b15cef8314c3b3f38f0124e070b98eae37;p=linux.git powerpc/xive: Fix missing check of rc != OPAL_BUSY 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 Signed-off-by: Michael Ellerman --- 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); }