In size_show(), the dax_dev_rwsem only needs a read lock, but was
acquiring a write lock. Change it to down_read_interruptible() so it
doesn't unnecessarily hold a write lock.
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Fixes: c05ae9d85b47 ("dax/bus.c: replace driver-core lock usage by a local rwsem")
Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
---
drivers/dax/bus.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index db183eb5ce3a..66095e60a279 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -939,11 +939,11 @@ static ssize_t size_show(struct device *dev,
unsigned long long size;
int rc;
- rc = down_write_killable(&dax_dev_rwsem);
+ rc = down_read_interruptible(&dax_dev_rwsem);
if (rc)
return rc;
size = dev_dax_size(dev_dax);
- up_write(&dax_dev_rwsem);
+ up_read(&dax_dev_rwsem);
return sysfs_emit(buf, "%llu\n", size);
}
--
2.44.0
