Hi James,
have you noticed this patch?
Dne 7.2.2017 v 15:08 Maurizio Lombardi napsal(a):
> With multipath, it may happen that the same device is passed
> to enclosure_add_device() multiple times and that the enclosure_add_links()
> function fails to create the symlinks because the device's sysfs
> directory entry is still NULL.
> In this case, the links will never be created because all the subsequent
> calls to enclosure_add_device() will immediately fail with EEXIST.
>
> This patch modifies the code so the driver will detect this condition
> and will retry to create the symlinks when enclosure_add_device() is called.
>
> Signed-off-by: Maurizio Lombardi <mlombard@xxxxxxxxxx>
> ---
> drivers/misc/enclosure.c | 16 ++++++++++++++--
> include/linux/enclosure.h | 1 +
> 2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
> index 65fed71..a856c98 100644
> --- a/drivers/misc/enclosure.c
> +++ b/drivers/misc/enclosure.c
> @@ -375,21 +375,33 @@ int enclosure_add_device(struct enclosure_device *edev, int component,
> struct device *dev)
> {
> struct enclosure_component *cdev;
> + int error;
>
> if (!edev || component >= edev->components)
> return -EINVAL;
>
> cdev = &edev->component[component];
>
> - if (cdev->dev == dev)
> + if (cdev->dev == dev) {
> + if (!cdev->links_created) {
> + error = enclosure_add_links(cdev);
> + if (!error)
> + cdev->links_created = 1;
> + }
> return -EEXIST;
> + }
>
> if (cdev->dev)
> enclosure_remove_links(cdev);
>
> put_device(cdev->dev);
> cdev->dev = get_device(dev);
> - return enclosure_add_links(cdev);
> + error = enclosure_add_links(cdev);
> + if (!error)
> + cdev->links_created = 1;
> + else
> + cdev->links_created = 0;
> + return error;
> }
> EXPORT_SYMBOL_GPL(enclosure_add_device);
>
> diff --git a/include/linux/enclosure.h b/include/linux/enclosure.h
> index a4cf57c..c3bdc4c 100644
> --- a/include/linux/enclosure.h
> +++ b/include/linux/enclosure.h
> @@ -97,6 +97,7 @@ struct enclosure_component {
> struct device cdev;
> struct device *dev;
> enum enclosure_component_type type;
> + int links_created;
> int number;
> int fault;
> int active;
>
