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authorIsrael Rukshin <israelr@mellanox.com>2018-01-04 17:56:14 +0200
committerChristoph Hellwig <hch@lst.de>2018-01-08 16:57:00 +0100
commitb837b28394fb76993c28bb242db7061ee0417da6 (patch)
tree984a1538859490dbc63e1c8e9fb13a8d3337160c /drivers/nvme
parent85088c4a0f65f0be25a98164ec6bca02ac5cad04 (diff)
downloadlinux-b837b28394fb76993c28bb242db7061ee0417da6.tar.bz2
nvme: fix subsystem multiple controllers support check
There is a problem when another module (e.g. nvmet) takes a reference on the nvme block device and the physical nvme drive is removed. In that case nvme_free_ctrl() will not be called and the controller state will be "deleting" or "dead" unless nvmet module releases the block device. Later on, the same nvme drive probes back and nvme_init_subsystem() will be called and fail due to duplicate subnqn (if the nvme device doesn't support subsystem with multiple controllers). This will cause a probe failure. This commit changes the check of multiple controllers support at nvme_init_subsystem() by not counting all the controllers at "dead" or "deleting" state (this is safe because controllers at this state will never be active again). Fixes: ab9e00cc72fa ("nvme: track subsystems") Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Israel Rukshin <israelr@mellanox.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c8bcfe64e976..2bcd49584f71 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2069,6 +2069,22 @@ static const struct attribute_group *nvme_subsys_attrs_groups[] = {
NULL,
};
+static int nvme_active_ctrls(struct nvme_subsystem *subsys)
+{
+ int count = 0;
+ struct nvme_ctrl *ctrl;
+
+ mutex_lock(&subsys->lock);
+ list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
+ if (ctrl->state != NVME_CTRL_DELETING &&
+ ctrl->state != NVME_CTRL_DEAD)
+ count++;
+ }
+ mutex_unlock(&subsys->lock);
+
+ return count;
+}
+
static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
struct nvme_subsystem *subsys, *found;
@@ -2107,7 +2123,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
* Verify that the subsystem actually supports multiple
* controllers, else bail out.
*/
- if (!(id->cmic & (1 << 1))) {
+ if (nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
dev_err(ctrl->device,
"ignoring ctrl due to duplicate subnqn (%s).\n",
found->subnqn);