[PATCH] scsi: target: fix unmap_zeroes_data boolean initialisation

[David Disseldorp <ddiss@suse.de>]

The LIO unmap_zeroes_data device attribute is mapped to the LBPRZ flag in
the READ CAPACITY (16) and Thin Provisioning VPD INQUIRY responses.
It's exposed via configfs, where any write value is correctly validated
via strtobool(), defaults to 0. However, when initialised via
target_configure_unmap_from_queue() it takes the value of the device's
max_write_zeroes_sectors queue limit, which is non-boolean.

Fixes: 2237498f0b5c ("target/iblock: Convert WRITE_SAME to blkdev_issue_zeroout")
Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 drivers/target/target_core_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 2d19f0e332b0..2c7ba2f7e13c 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -829,7 +829,7 @@ bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 	attrib->unmap_granularity = q->limits.discard_granularity / block_size;
 	attrib->unmap_granularity_alignment = q->limits.discard_alignment /
 								block_size;
-	attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
+	attrib->unmap_zeroes_data = !!(q->limits.max_write_zeroes_sectors);
 	return true;
 }
 EXPORT_SYMBOL(target_configure_unmap_from_queue);
-- 
2.16.4