Once the reserved page array is unused we can reset the
'res_in_use' state; here we can do a lazy update without
holding the mutex as we only need to check against
concurrent access, not concurrent release.
Fixes: 1bc0eb0 ("scsi: sg: protect accesses to 'reserved' page array")
Signed-off-by: Hannes Reinecke <hare@xxxxxxxx>
---
drivers/scsi/sg.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 8147147..06503c1 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2056,6 +2056,8 @@ static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned lon
req_schp->page_order = 0;
req_schp->sglist_len = 0;
srp->res_used = 0;
+ /* Called without mutex lock to avoid deadlock */
+ sfp->res_in_use = 0;
}
static Sg_request *
--
1.8.5.6
