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author | Christoph Hellwig | 2019-05-17 11:47:36 +0200 |
---|---|---|
committer | Greg Kroah-Hartman | 2019-06-19 08:18:03 +0200 |
commit | ddda7e850bf10302b0bb6036dde40e60d8377f3a (patch) | |
tree | a63d5e8d23de4fcf07c101df218ceda10145d196 /drivers/nvme/host/core.c | |
parent | nvme: merge nvme_ns_ioctl into nvme_ioctl (diff) | |
download | kernel-qcow2-linux-ddda7e850bf10302b0bb6036dde40e60d8377f3a.tar.gz kernel-qcow2-linux-ddda7e850bf10302b0bb6036dde40e60d8377f3a.tar.xz kernel-qcow2-linux-ddda7e850bf10302b0bb6036dde40e60d8377f3a.zip |
nvme: release namespace SRCU protection before performing controller ioctls
[ Upstream commit 5fb4aac756acacf260b9ebd88747251effa3a2f2 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/nvme/host/core.c')
-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 82f5f1d030d4..818788275406 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1310,14 +1310,31 @@ 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; @@ -1327,8 +1344,6 @@ 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; } |