[PATCH v7 1/6] block: genhd: add an interface to set disk poll interval

[Aaron Lu]

Signed-off-by: Aaron Lu <aaron...@intel.com>
---
 block/genhd.c         | 23 +++++++++++++++++------
 include/linux/genhd.h |  1 +
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index cac7366..4244256 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1627,6 +1627,19 @@ static void disk_events_workfn(struct work_struct *work)
                kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);
 }
 
+int disk_events_set_poll_msecs(struct gendisk *disk, long intv)
+{
+       if (intv < 0 && intv != -1)
+               return -EINVAL;
+
+       disk_block_events(disk);
+       disk->ev->poll_msecs = intv;
+       __disk_unblock_events(disk, true);
+
+       return 0;
+}
+EXPORT_SYMBOL(disk_events_set_poll_msecs);
+
 /*
  * A disk events enabled device has the following sysfs nodes under
  * its /sys/block/X/ directory.
@@ -1683,16 +1696,14 @@ static ssize_t disk_events_poll_msecs_store(struct 
device *dev,
 {
        struct gendisk *disk = dev_to_disk(dev);
        long intv;
+       int ret;
 
        if (!count || !sscanf(buf, "%ld", &intv))
                return -EINVAL;
 
-       if (intv < 0 && intv != -1)
-               return -EINVAL;
-
-       disk_block_events(disk);
-       disk->ev->poll_msecs = intv;
-       __disk_unblock_events(disk, true);
+       ret = disk_events_set_poll_msecs(disk, intv);
+       if (ret)
+               return ret;
 
        return count;
 }
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 4f440b3..63409e5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -423,6 +423,7 @@ extern void disk_block_events(struct gendisk *disk);
 extern void disk_unblock_events(struct gendisk *disk);
 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
+extern int disk_events_set_poll_msecs(struct gendisk *disk, long intv);
 
 /* drivers/char/random.c */
 extern void add_disk_randomness(struct gendisk *disk);
-- 
1.7.12.21.g871e293

--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html