linux-kernel - [PATCH] nvme: make controller 'state' sysfs attribute pollable

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Date:   Wed, 20 Sep 2017 12:40:32 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>
Cc:     Hannes Reinecke <hare@...e.de>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH] nvme: make controller 'state' sysfs attribute pollable

Notify sysfs about changes of a nvme controller so user-space can watch the
file via poll() or select() in order to react to a state change.

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
---
 drivers/nvme/host/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index acc816b67582..064d973f1e22 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -237,8 +237,10 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		break;
 	}
 
-	if (changed)
+	if (changed) {
 		ctrl->state = new_state;
+		sysfs_notify(&ctrl->dev->kobj, NULL, "state");
+	}
 
 	spin_unlock_irqrestore(&ctrl->lock, flags);
 
-- 
2.13.5