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nvme: take refcount on transport module

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The block device is backed by the transport so we must ensure that the
transport driver will not be removed until all references are released.
Otherwise, we might end up referencing freed memory.

Reviewed-by: Max Gurtovoy <[email protected]>
Signed-off-by: Nitzan Carmi <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Nitzan Carmi 2018-01-04 17:56:13 +02:00 • committed by Christoph Hellwig
commit 85088c4a0f
1 changed files with 14 additions and 3 deletions
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17
drivers/nvme/host/core.c
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@ -1228,16 +1228,27 @@ static int nvme_open(struct block_device *bdev, fmode_t mode)
#ifdef CONFIG_NVME_MULTIPATH
/* should never be called due to GENHD_FL_HIDDEN */
if (WARN_ON_ONCE(ns->head->disk))
return -ENXIO;
goto fail;
#endif
if (!kref_get_unless_zero(&ns->kref))
return -ENXIO;
goto fail;
if (!try_module_get(ns->ctrl->ops->module))
goto fail_put_ns;
return 0;
fail_put_ns:
nvme_put_ns(ns);
fail:
return -ENXIO;
}
static void nvme_release(struct gendisk *disk, fmode_t mode)
{
nvme_put_ns(disk->private_data);
struct nvme_ns *ns = disk->private_data;
module_put(ns->ctrl->ops->module);
nvme_put_ns(ns);
}
static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)