[PATCH] nvme: honour O_NONBLOCK during resetting

[Hannes Reinecke]

When opening a controller device node we should honour the O_NONBLOCK
flag to allow the device to be openend even if it's in state 'resetting'
or 'connecting'. This allows user-space applications to use a call to 'open'
to figure out if the controller is present, even if it's currently
undergoing a reset.

Signed-off-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/host/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 74980a1cf89e..67cde3eaf5b0 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3136,6 +3136,11 @@ static int nvme_dev_open(struct inode *inode, struct file *file)
 	switch (ctrl->state) {
 	case NVME_CTRL_LIVE:
 		break;
+	case NVME_CTRL_RESETTING:
+	case NVME_CTRL_CONNECTING:
+		if (file->f_flags & O_NONBLOCK)
+			break;
+		fallthrough;
 	default:
 		return -EWOULDBLOCK;
 	}
-- 
2.29.2