From 163f52b6cf3a639df6a72c7937e0eb88b20f1ef3 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sat, 1 Aug 2009 00:39:36 +0000 Subject: [SCSI] ses: fix hotplug with multiple devices and expanders In a situation either with expanders or with multiple enclosure devices, hot add doesn't always work. This is because we try to find a single enclosure device attached to the host. Fix this by looping over all enclosure devices attached to the host and also by making the find loop recognise that the enclosure devices may be expander remote (i.e. not parented by the host). Signed-off-by: James Bottomley Signed-off-by: James Bottomley --- drivers/misc/enclosure.c | 44 ++++++++++++++++++++++++++++++++------------ 1 file changed, 32 insertions(+), 12 deletions(-) (limited to 'drivers/misc/enclosure.c') diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 348443bdb23b..789d12128c24 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -33,24 +33,44 @@ static DEFINE_MUTEX(container_list_lock); static struct class enclosure_class; /** - * enclosure_find - find an enclosure given a device - * @dev: the device to find for + * enclosure_find - find an enclosure given a parent device + * @dev: the parent to match against + * @start: Optional enclosure device to start from (NULL if none) * - * Looks through the list of registered enclosures to see - * if it can find a match for a device. Returns NULL if no - * enclosure is found. Obtains a reference to the enclosure class - * device which must be released with device_put(). + * Looks through the list of registered enclosures to find all those + * with @dev as a parent. Returns NULL if no enclosure is + * found. @start can be used as a starting point to obtain multiple + * enclosures per parent (should begin with NULL and then be set to + * each returned enclosure device). Obtains a reference to the + * enclosure class device which must be released with device_put(). + * If @start is not NULL, a reference must be taken on it which is + * released before returning (this allows a loop through all + * enclosures to exit with only the reference on the enclosure of + * interest held). Note that the @dev may correspond to the actual + * device housing the enclosure, in which case no iteration via @start + * is required. */ -struct enclosure_device *enclosure_find(struct device *dev) +struct enclosure_device *enclosure_find(struct device *dev, + struct enclosure_device *start) { struct enclosure_device *edev; mutex_lock(&container_list_lock); - list_for_each_entry(edev, &container_list, node) { - if (edev->edev.parent == dev) { - get_device(&edev->edev); - mutex_unlock(&container_list_lock); - return edev; + edev = list_prepare_entry(start, &container_list, node); + if (start) + put_device(&start->edev); + + list_for_each_entry_continue(edev, &container_list, node) { + struct device *parent = edev->edev.parent; + /* parent might not be immediate, so iterate up to + * the root of the tree if necessary */ + while (parent) { + if (parent == dev) { + get_device(&edev->edev); + mutex_unlock(&container_list_lock); + return edev; + } + parent = parent->parent; } } mutex_unlock(&container_list_lock); -- cgit v1.2.3 From 43d8eb9cfd0aea93be32181c64e18191b69c211c Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sat, 1 Aug 2009 00:41:22 +0000 Subject: [SCSI] ses: add support for enclosure component hot removal Right at the moment, hot removal of a device within an enclosure does nothing (because the intf_remove only copes with enclosure removal not with component removal). Fix this by adding a function to remove the component. Also needed to fix the prototype of enclosure_remove_device, since we know the device we've removed but not the internal component number Signed-off-by: James Bottomley Signed-off-by: James Bottomley --- drivers/misc/enclosure.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) (limited to 'drivers/misc/enclosure.c') diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 789d12128c24..850706a5e553 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -332,19 +332,25 @@ EXPORT_SYMBOL_GPL(enclosure_add_device); * Returns zero on success or an error. * */ -int enclosure_remove_device(struct enclosure_device *edev, int component) +int enclosure_remove_device(struct enclosure_device *edev, struct device *dev) { struct enclosure_component *cdev; + int i; - if (!edev || component >= edev->components) + if (!edev || !dev) return -EINVAL; - cdev = &edev->component[component]; - - device_del(&cdev->cdev); - put_device(cdev->dev); - cdev->dev = NULL; - return device_add(&cdev->cdev); + for (i = 0; i < edev->components; i++) { + cdev = &edev->component[i]; + if (cdev->dev == dev) { + enclosure_remove_links(cdev); + device_del(&cdev->cdev); + put_device(dev); + cdev->dev = NULL; + return device_add(&cdev->cdev); + } + } + return -ENODEV; } EXPORT_SYMBOL_GPL(enclosure_remove_device); -- cgit v1.2.3 From 21fab1d0595eacf781705ec3509012a28f298245 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sat, 1 Aug 2009 00:43:59 +0000 Subject: [SCSI] ses: update enclosure data on hot add Now that hot add works correctly, if a new device is added, we're still operating on stale enclosure data, so fix that by updating the enclosure diagnostic pages when we get notified of a device hot add Signed-off-by: James Bottomley Signed-off-by: James Bottomley --- drivers/misc/enclosure.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/misc/enclosure.c') diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 850706a5e553..7b039306037f 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -315,6 +315,9 @@ int enclosure_add_device(struct enclosure_device *edev, int component, cdev = &edev->component[component]; + if (cdev->dev == dev) + return -EEXIST; + if (cdev->dev) enclosure_remove_links(cdev); -- cgit v1.2.3 From a4dbd6740df0872cdf0a86841f75beec8381964d Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 24 Jun 2009 10:06:31 -0700 Subject: driver model: constify attribute groups Let attribute group vectors be declared "const". We'd like to let most attribute metadata live in read-only sections... this is a start. Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/misc/enclosure.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/misc/enclosure.c') diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 7b039306037f..e9eae4a78402 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -238,7 +238,7 @@ static void enclosure_component_release(struct device *dev) put_device(dev->parent); } -static struct attribute_group *enclosure_groups[]; +static const struct attribute_group *enclosure_groups[]; /** * enclosure_component_register - add a particular component to an enclosure @@ -536,7 +536,7 @@ static struct attribute_group enclosure_group = { .attrs = enclosure_component_attrs, }; -static struct attribute_group *enclosure_groups[] = { +static const struct attribute_group *enclosure_groups[] = { &enclosure_group, NULL }; -- cgit v1.2.3