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Date: Wed, 25 Jan 2017 16:57:09 +0000 From: Stephen Hemminger <sthemmin@...rosoft.com> To: Vitaly Kuznetsov <vkuznets@...hat.com>, "devel@...uxdriverproject.org" <devel@...uxdriverproject.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "KY Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com> Subject: RE: [PATCH] Drivers: hv: balloon: add a comment explaining fall through in hv_memory_notifier() Simpe /* fallthrough */ is enough -----Original Message----- From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com] Sent: Wednesday, January 25, 2017 8:27 AM To: devel@...uxdriverproject.org Cc: linux-kernel@...r.kernel.org; KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com> Subject: [PATCH] Drivers: hv: balloon: add a comment explaining fall through in hv_memory_notifier() Coverity scan gives a warning when there is fall through in a switch without a comment. Reported-by: Stephen Hemminger <sthemmin@...rosoft.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com> --- drivers/hv/hv_balloon.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 14c3dc4..7e2479f 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -587,6 +587,12 @@ static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, spin_lock_irqsave(&dm_device.ha_lock, flags); dm_device.num_pages_onlined += mem->nr_pages; spin_unlock_irqrestore(&dm_device.ha_lock, flags); + /* + * Fall through - ol_waitevent needs to be completed to unblock + * hv_mem_hot_add() allowing it to process next requests + * regardless of the result of if we were able to online this + * block. + */ case MEM_CANCEL_ONLINE: if (dm_device.ha_waiting) { dm_device.ha_waiting = false; -- 2.9.3
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