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authorChristoph Hellwig <hch@lst.de>2019-05-17 11:47:36 +0200
committerKeith Busch <keith.busch@intel.com>2019-05-17 11:07:11 -0600
commit5fb4aac756acacf260b9ebd88747251effa3a2f2 (patch)
treed13d9c345611a678d7707bed27dddb39e4f92f9e /drivers/nvme
parent90ec611adcf20b96d0c2b7166497d53e4301a57f (diff)
downloadlinux-5fb4aac756acacf260b9ebd88747251effa3a2f2.tar.bz2
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.c25
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;
}