diff options
| author |   Christoph Hellwig <hch@lst.de> | 2019-05-17 11:47:36 +0200 |
|---|---|---|
| committer |   Keith Busch <keith.busch@intel.com> | 2019-05-17 11:07:11 -0600 |
| commit | 5fb4aac756acacf260b9ebd88747251effa3a2f2 (patch) | |
| tree | d13d9c345611a678d7707bed27dddb39e4f92f9e /drivers/nvme | |
| parent | nvme: merge nvme_ns_ioctl into nvme_ioctl (diff) | |
| download | linux-dev-5fb4aac756acacf260b9ebd88747251effa3a2f2.tar.xz linux-dev-5fb4aac756acacf260b9ebd88747251effa3a2f2.zip | |
nvme: release namespace SRCU protection before performing controller ioctls
Holding the SRCU critical section protecting the namespace list can
cause deadlocks when using the per-namespace admin passthrough ioctl to
delete as namespace. Release it earlier when performing per-controller
ioctls to avoid that.
Reported-by: Kenneth Heitke <kenneth.heitke@intel.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/core.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index bc288990fd50..d4226c18eb71 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1394,14 +1394,31 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, if (unlikely(!ns)) return -EWOULDBLOCK; + /* + * Handle ioctls that apply to the controller instead of the namespace + * seperately and drop the ns SRCU reference early. This avoids a + * deadlock when deleting namespaces using the passthrough interface. + */ + if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) { + struct nvme_ctrl *ctrl = ns->ctrl; + + nvme_get_ctrl(ns->ctrl); + nvme_put_ns_from_disk(head, srcu_idx); + + if (cmd == NVME_IOCTL_ADMIN_CMD) + ret = nvme_user_cmd(ctrl, NULL, argp); + else + ret = sed_ioctl(ctrl->opal_dev, cmd, argp); + + nvme_put_ctrl(ctrl); + return ret; + } + switch (cmd) { case NVME_IOCTL_ID: force_successful_syscall_return(); ret = ns->head->ns_id; break; - case NVME_IOCTL_ADMIN_CMD: - ret = nvme_user_cmd(ns->ctrl, NULL, argp); - break; case NVME_IOCTL_IO_CMD: ret = nvme_user_cmd(ns->ctrl, ns, argp); break; @@ -1411,8 +1428,6 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, default: if (ns->ndev) ret = nvme_nvm_ioctl(ns, cmd, arg); - else if (is_sed_ioctl(cmd)) - ret = sed_ioctl(ns->ctrl->opal_dev, cmd, argp); else ret = -ENOTTY; } |