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authorJames Smart <james.smart@broadcom.com>2020-08-28 12:01:50 -0700
committerChristoph Hellwig <hch@lst.de>2020-09-08 19:46:28 +0200
commitb63de8400a6e1001b5732286cf6f5ec27799b7b4 (patch)
treec92f16227db5bad64b774fa28ae2d18a4c022e66 /drivers
parent88ce2a530cc9865a894454b2e40eba5957a60e1a (diff)
nvme: Revert: Fix controller creation races with teardown flow
The indicated patch introduced a barrier in the sysfs_delete attribute for the controller that rejects the request if the controller isn't created. "Created" is defined as at least 1 call to nvme_start_ctrl(). This is problematic in error-injection testing. If an error occurs on the initial attempt to create an association and the controller enters reconnect(s) attempts, the admin cannot delete the controller until either there is a successful association created or ctrl_loss_tmo times out. Where this issue is particularly hurtful is when the "admin" is the nvme-cli, it is performing a connection to a discovery controller, and it is initiated via auto-connect scripts. With the FC transport, if the first connection attempt fails, the controller enters a normal reconnect state but returns control to the cli thread that created the controller. In this scenario, the cli attempts to read the discovery log via ioctl, which fails, causing the cli to see it as an empty log and then proceeds to delete the discovery controller. The delete is rejected and the controller is left live. If the discovery controller reconnect then succeeds, there is no action to delete it, and it sits live doing nothing. Cc: <stable@vger.kernel.org> # v5.7+ Fixes: ce1518139e69 ("nvme: Fix controller creation races with teardown flow") Signed-off-by: James Smart <james.smart@broadcom.com> CC: Israel Rukshin <israelr@mellanox.com> CC: Max Gurtovoy <maxg@mellanox.com> CC: Christoph Hellwig <hch@lst.de> CC: Keith Busch <kbusch@kernel.org> CC: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/nvme/host/core.c5
-rw-r--r--drivers/nvme/host/nvme.h1
2 files changed, 0 insertions, 6 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 5702a3843746..8b75f6ca0b61 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3525,10 +3525,6 @@ static ssize_t nvme_sysfs_delete(struct device *dev,
{
struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
- /* Can't delete non-created controllers */
- if (!ctrl->created)
- return -EBUSY;
-
if (device_remove_file_self(dev, attr))
nvme_delete_ctrl_sync(ctrl);
return count;
@@ -4403,7 +4399,6 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl)
nvme_queue_scan(ctrl);
nvme_start_queues(ctrl);
}
- ctrl->created = true;
}
EXPORT_SYMBOL_GPL(nvme_start_ctrl);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 2910f6caab7d..9fd45ff656da 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -307,7 +307,6 @@ struct nvme_ctrl {
struct nvme_command ka_cmd;
struct work_struct fw_act_work;
unsigned long events;
- bool created;
#ifdef CONFIG_NVME_MULTIPATH
/* asymmetric namespace access: */