Messages in this thread Patch in this message | | | From | Adam Manzanares <> | Subject | [PATCH] nvme: Cleanup per-namespace chardev deletion | Date | Wed, 13 Oct 2021 15:04:19 +0000 |
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Decrease reference count of chardevice during char device deletion in order to fix a kmemleak. Add relese function for the device associated chardev and moved ida_simple_remove into the release function.
Fixes: 2637bae (nvme: introduce generic per-namespace chardev) Reported-by: Yi Zhang <yi.zhang@redhat.com> Suggested-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Adam Manzanares <a.manzanares@samsung.com> --- drivers/nvme/host/core.c | 21 ++++++++++++--------- drivers/nvme/host/multipath.c | 2 -- 2 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index f9a25c61fb8b..3bc4bb620ab7 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3583,10 +3583,15 @@ static int __nvme_check_ids(struct nvme_subsystem *subsys, return 0; } +static void nvme_cdev_rel(struct device *dev) +{ + ida_simple_remove(&nvme_ns_chr_minor_ida, MINOR(dev->devt)); +} + void nvme_cdev_del(struct cdev *cdev, struct device *cdev_device) { cdev_device_del(cdev, cdev_device); - ida_simple_remove(&nvme_ns_chr_minor_ida, MINOR(cdev_device->devt)); + put_device(cdev_device); } int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device, @@ -3599,14 +3604,14 @@ int nvme_cdev_add(struct cdev *cdev, struct device *cdev_device, return minor; cdev_device->devt = MKDEV(MAJOR(nvme_ns_chr_devt), minor); cdev_device->class = nvme_ns_chr_class; + cdev_device->release = nvme_cdev_rel; device_initialize(cdev_device); cdev_init(cdev, fops); cdev->owner = owner; ret = cdev_device_add(cdev, cdev_device); - if (ret) { + if (ret) put_device(cdev_device); - ida_simple_remove(&nvme_ns_chr_minor_ida, minor); - } + return ret; } @@ -3638,11 +3643,9 @@ static int nvme_add_ns_cdev(struct nvme_ns *ns) ns->ctrl->instance, ns->head->instance); if (ret) return ret; - ret = nvme_cdev_add(&ns->cdev, &ns->cdev_device, &nvme_ns_chr_fops, - ns->ctrl->ops->module); - if (ret) - kfree_const(ns->cdev_device.kobj.name); - return ret; + + return nvme_cdev_add(&ns->cdev, &ns->cdev_device, &nvme_ns_chr_fops, + ns->ctrl->ops->module); } static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index fb96e900dd3a..bd490a7c4808 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -434,8 +434,6 @@ static int nvme_add_ns_head_cdev(struct nvme_ns_head *head) return ret; ret = nvme_cdev_add(&head->cdev, &head->cdev_device, &nvme_ns_head_chr_fops, THIS_MODULE); - if (ret) - kfree_const(head->cdev_device.kobj.name); return ret; } -- 2.25.1
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