[v21,32/46] sg: add some __must_hold macros

Commit Message

Douglas Gilbert Oct. 3, 2021, 4:31 p.m. UTC

In the case of sg_wait_open_event() which calls mutex_unlock on
sdp->open_rel_lock and later calls mutex_lock on the same
lock; this macro is needed to stop sparse complaining. In
other cases it is a reminder to the coder (a precondition).

Reviewed-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Douglas Gilbert <[e-mail]>
---
 drivers/scsi/sg.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 7e088d9cda4e..a7eebc1d5407 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -375,6 +375,7 @@  sg_check_file_access(struct file *filp, const char *caller)
 
 static int
 sg_wait_open_event(struct sg_device *sdp, bool o_excl)
+		__must_hold(sdp->open_rel_lock)
 {
 	int res = 0;
 
@@ -1728,6 +1729,7 @@  sg_ctl_sg_io(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp,
  */
 static int
 sg_set_reserved_sz(struct sg_fd *sfp, int want_rsv_sz)
+		__must_hold(sfp->f_mutex)
 {
 	int new_sz, blen, res;
 	unsigned long iflags;
@@ -3579,12 +3581,12 @@  sg_remove_sfp(struct kref *kref)
 
 static int
 sg_idr_max_id(int id, void *p, void *data)
+		__must_hold(sg_index_lock)
 {
 	int *k = data;
 
 	if (*k < id)
 		*k = id;
-
 	return 0;
 }
 
@@ -3887,6 +3889,7 @@  sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
 /* Writes debug info for one sg_request in obp buffer */
 static int
 sg_proc_debug_sreq(struct sg_request *srp, int to, char *obp, int len)
+		__must_hold(sfp->srp_arr.xa_lock)
 {
 	bool is_v3v4, v4, is_dur;
 	int n = 0;
@@ -3989,6 +3992,7 @@  sg_proc_debug_fd(struct sg_fd *fp, char *obp, int len, unsigned long idx)
 /* Writes debug info for one sg device (including its sg fds) in obp buffer */
 static int
 sg_proc_debug_sdev(struct sg_device *sdp, char *obp, int len, int *fd_counterp)
+		__must_hold(sg_index_lock)
 {
 	int n = 0;
 	int my_count = 0;