scsi: rescan VPD attributes
The VPD page information might change, so we need to be able to update
it. This patch implements a VPD page rescan whenever the 'rescan' sysfs
attribute is triggered.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 8d23122..158f1b55 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -760,11 +760,15 @@
{ \
struct device *dev = container_of(kobj, struct device, kobj); \
struct scsi_device *sdev = to_scsi_device(dev); \
+ int ret; \
if (!sdev->vpd_##_page) \
return -EINVAL; \
- return memory_read_from_buffer(buf, count, &off, \
- sdev->vpd_##_page, \
+ rcu_read_lock(); \
+ ret = memory_read_from_buffer(buf, count, &off, \
+ rcu_dereference(sdev->vpd_##_page), \
sdev->vpd_##_page##_len); \
+ rcu_read_unlock(); \
+ return ret; \
} \
static struct bin_attribute dev_attr_vpd_##_page = { \
.attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \