diff options
| author | Logan Gunthorpe | 2019-07-31 17:35:32 -0600 |
|---|---|---|
| committer | Sagi Grimberg | 2019-07-31 17:57:17 -0700 |
| commit | 86b9a63e595ff03f9d0a7b92b6acc231fecefc29 (patch) | |
| tree | 2c64fb11f909916e60bd11b8aa9a8a8707660f8e /drivers/nvme/target | |
| parent | 3aed86731ee2b23e4dc4d2c6d943d33992cd551b (diff) | |
nvmet-loop: Flush nvme_delete_wq when removing the port
After calling nvme_loop_delete_ctrl(), the controllers will not
yet be deleted because nvme_delete_ctrl() only schedules work
to do the delete.
This means a race can occur if a port is removed but there
are still active controllers trying to access that memory.
To fix this, flush the nvme_delete_wq before returning from
nvme_loop_remove_port() so that any controllers that might
be in the process of being deleted won't access a freed port.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by : Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to 'drivers/nvme/target')
| -rw-r--r-- | drivers/nvme/target/loop.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index b16dc3981c69..0940c5024a34 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -654,6 +654,14 @@ static void nvme_loop_remove_port(struct nvmet_port *port) mutex_lock(&nvme_loop_ports_mutex); list_del_init(&port->entry); mutex_unlock(&nvme_loop_ports_mutex); + + /* + * Ensure any ctrls that are in the process of being + * deleted are in fact deleted before we return + * and free the port. This is to prevent active + * ctrls from using a port after it's freed. + */ + flush_workqueue(nvme_delete_wq); } static const struct nvmet_fabrics_ops nvme_loop_ops = { |