The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 5e1f689913a4498e3081093670ef9d85b2c60920 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 29 Apr 2021 14:18:53 +0200
Subject: [PATCH] nvme-multipath: fix double initialization of ANA state
nvme_init_identify and thus nvme_mpath_init can be called multiple
times and thus must not overwrite potentially initialized or in-use
fields. Split out a helper for the basic initialization when the
controller is initialized and make sure the init_identify path does
not blindly change in-use data structures.
Fixes: 0d0b660f214d ("nvme: add ANA support")
Reported-by: Martin Wilck <mwilck@xxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Keith Busch <kbusch@xxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 522c9b229f80..762125f2905f 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2901,7 +2901,7 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
}
- ret = nvme_mpath_init(ctrl, id);
+ ret = nvme_mpath_init_identify(ctrl, id);
if (ret < 0)
goto out_free;
@@ -4364,6 +4364,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
min(default_ps_max_latency_us, (unsigned long)S32_MAX));
nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
+ nvme_mpath_init_ctrl(ctrl);
return 0;
out_free_name:
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 0551796517e6..deb14562c96a 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -781,9 +781,18 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
put_disk(head->disk);
}
-int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
+void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)
{
- int error;
+ mutex_init(&ctrl->ana_lock);
+ timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0);
+ INIT_WORK(&ctrl->ana_work, nvme_ana_work);
+}
+
+int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
+{
+ size_t max_transfer_size = ctrl->max_hw_sectors << SECTOR_SHIFT;
+ size_t ana_log_size;
+ int error = 0;
/* check if multipath is enabled and we have the capability */
if (!multipath || !ctrl->subsys ||
@@ -795,37 +804,31 @@ int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
ctrl->nanagrpid = le32_to_cpu(id->nanagrpid);
ctrl->anagrpmax = le32_to_cpu(id->anagrpmax);
- mutex_init(&ctrl->ana_lock);
- timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0);
- ctrl->ana_log_size = sizeof(struct nvme_ana_rsp_hdr) +
- ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc);
- ctrl->ana_log_size += ctrl->max_namespaces * sizeof(__le32);
-
- if (ctrl->ana_log_size > ctrl->max_hw_sectors << SECTOR_SHIFT) {
+ ana_log_size = sizeof(struct nvme_ana_rsp_hdr) +
+ ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc) +
+ ctrl->max_namespaces * sizeof(__le32);
+ if (ana_log_size > max_transfer_size) {
dev_err(ctrl->device,
- "ANA log page size (%zd) larger than MDTS (%d).\n",
- ctrl->ana_log_size,
- ctrl->max_hw_sectors << SECTOR_SHIFT);
+ "ANA log page size (%zd) larger than MDTS (%zd).\n",
+ ana_log_size, max_transfer_size);
dev_err(ctrl->device, "disabling ANA support.\n");
- return 0;
+ goto out_uninit;
}
-
- INIT_WORK(&ctrl->ana_work, nvme_ana_work);
- kfree(ctrl->ana_log_buf);
- ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL);
- if (!ctrl->ana_log_buf) {
- error = -ENOMEM;
- goto out;
+ if (ana_log_size > ctrl->ana_log_size) {
+ nvme_mpath_stop(ctrl);
+ kfree(ctrl->ana_log_buf);
+ ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL);
+ if (!ctrl->ana_log_buf)
+ return -ENOMEM;
}
-
+ ctrl->ana_log_size = ana_log_size;
error = nvme_read_ana_log(ctrl);
if (error)
- goto out_free_ana_log_buf;
+ goto out_uninit;
return 0;
-out_free_ana_log_buf:
- kfree(ctrl->ana_log_buf);
- ctrl->ana_log_buf = NULL;
-out:
+
+out_uninit:
+ nvme_mpath_uninit(ctrl);
return error;
}
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 05f31a2c64bb..0015860ec12b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -712,7 +712,8 @@ void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
void nvme_mpath_remove_disk(struct nvme_ns_head *head);
-int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
+int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id);
+void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl);
void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
void nvme_mpath_stop(struct nvme_ctrl *ctrl);
bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
@@ -780,7 +781,10 @@ static inline void nvme_mpath_check_last_path(struct nvme_ns *ns)
static inline void nvme_trace_bio_complete(struct request *req)
{
}
-static inline int nvme_mpath_init(struct nvme_ctrl *ctrl,
+static inline void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl)
+{
+}
+static inline int nvme_mpath_init_identify(struct nvme_ctrl *ctrl,
struct nvme_id_ctrl *id)
{
if (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)
