[PATCH] NVMe: Increase shutdown complete time

[keith.busch@intel.com (Keith Busch)]

The spec doesn't have a recommendation for shutdown beyond "that the host
wait a minimum of one second for the shutdown operations to complete",
so we need to choose an arbitrarily value so we don't wait forever but
high enough to prevent unsafe shutdowns. Some h/w vendors say the previous
two seconds is not long enough at some capacities. Twenty seconds ought
to be enough for anybody, right?

Signed-off-by: Keith Busch <keith.busch at intel.com>
---
 drivers/block/nvme-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 625259d..103da93 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1352,7 +1352,7 @@ static int nvme_shutdown_ctrl(struct nvme_dev *dev)
 	cc = (readl(&dev->bar->cc) & ~NVME_CC_SHN_MASK) | NVME_CC_SHN_NORMAL;
 	writel(cc, &dev->bar->cc);
 
-	timeout = 2 * HZ + jiffies;
+	timeout = 20 * HZ + jiffies;
 	while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) !=
 							NVME_CSTS_SHST_CMPLT) {
 		msleep(100);
-- 
1.7.10.4