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scsi: core: Fix early registration of sysfs attributes for scsi_device

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v4.17 commit 86b87cde0b ("scsi: core: host template attribute groups")
introduced explicit sysfs_create_groups() in scsi_sysfs_add_sdev()
and sysfs_remove_groups() in __scsi_remove_device(), both for sdev_gendev,
based on a new field const struct attribute_group **sdev_groups
of struct scsi_host_template.

Commit 92c4b58b15 ("scsi: core: Register sysfs attributes earlier")
removed above explicit (de)registration of scsi_device attribute groups.
It also converted all scsi_device attributes and attribute_groups to
end up in a new field const struct attribute_group *gendev_attr_groups[6]
of struct scsi_device. However, that new field was not used anywhere.

Surprisingly, this only caused missing LLDD specific scsi_device sysfs
attributes. Whereas, scsi core attributes from scsi_sdev_attr_groups
did continue to exist because of scsi_dev_type.groups.

We separate scsi core attibutes from LLDD specific attributes.
Hence, we keep the initializing assignment scsi_dev_type =
{ .groups = scsi_sdev_attr_groups, } as this takes care of core
attributes. Without the separation, it would cause attribute double
registration due to scsi_dev_type.groups and sdev_gendev.groups.

Julian suggested to assign the sdev_groups pointer of the
scsi_host_template directly to the groups pointer of sdev_gendev.
This way we can delete the container scsi_device.gendev_attr_groups
and the loop copying each entry from hostt->sdev_groups to
sdev->gendev_attr_groups.

Alternative approaches ruled out:
Assigning gendev_attr_groups to sdev_dev has no visible effect.
Assigning sdev->gendev_attr_groups to scsi_dev_type.groups
caused scsi_device of all scsi host types to get LLDD specific
attributes of the LLDD for which the last sdev alloc happened to occur,
as that overwrote scsi_dev_type.groups,
e.g. scsi_debug had zfcp-specific scsi_device attributes.

Link: https://lore.kernel.org/r/20211026014240.4098365-1-maier@linux.ibm.com
Fixes: 92c4b58b15 ("scsi: core: Register sysfs attributes earlier")
Suggested-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Steffen Maier 2021-10-26 03:42:40 +02:00 committed by Martin K. Petersen
parent feadce93e6
commit 3a71f0f7a5
2 changed files with 1 additions and 16 deletions
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11
drivers/scsi/scsi_sysfs.c
View File

@ -1571,7 +1571,6 @@ static struct device_type scsi_dev_type = {
void scsi_sysfs_device_initialize(struct scsi_device *sdev)
{
int i, j = 0;
unsigned long flags;
struct Scsi_Host *shost = sdev->host;
struct scsi_host_template *hostt = shost->hostt;
@ -1583,15 +1582,7 @@ void scsi_sysfs_device_initialize(struct scsi_device *sdev)
scsi_enable_async_suspend(&sdev->sdev_gendev);
dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
sdev->gendev_attr_groups[j++] = &scsi_sdev_attr_group;
if (hostt->sdev_groups) {
for (i = 0; hostt->sdev_groups[i] &&
j < ARRAY_SIZE(sdev->gendev_attr_groups);
i++, j++) {
sdev->gendev_attr_groups[j] = hostt->sdev_groups[i];
}
}
WARN_ON_ONCE(j >= ARRAY_SIZE(sdev->gendev_attr_groups));
sdev->sdev_gendev.groups = hostt->sdev_groups;
device_initialize(&sdev->sdev_dev);
sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);

6
include/scsi/scsi_device.h
View File

@ -225,12 +225,6 @@ struct scsi_device {
struct device sdev_gendev,
sdev_dev;
/*
* The array size 6 provides space for one attribute group for the
* SCSI core, four attribute groups defined by SCSI LLDs and one
* terminating NULL pointer.
*/
const struct attribute_group *gendev_attr_groups[6];
struct execute_work ew; /* used to get process context on put */
struct work_struct requeue_work;