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authorHannes Reinecke <hare@suse.de>2018-07-04 14:59:16 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-07-11 05:42:47 +0300
commitfa519f701d27198a2858bb108fc18ea9d8c106a7 (patch)
tree315d6c945db86d66ec34f403f9cb5da0bc77d9ef /drivers/scsi/libfc
parentee35624e1e4e4e9a26a30d56c25a07ba9cdd8ecb (diff)
downloadlinux-fa519f701d27198a2858bb108fc18ea9d8c106a7.tar.xz
scsi: libfc: fixup 'sleeping function called from invalid context'
fc_rport_login() will be calling mutex_lock() while running inside an RCU-protected section, triggering the warning 'sleeping function called from invalid context'. To fix this we can drop the rcu functions here altogether as the disc mutex protecting the list itself is already held, preventing any list manipulation. Fixes: a407c593398c ("scsi: libfc: Fixup disc_mutex handling") Signed-off-by: Hannes Reinecke <hare@suse.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libfc')
-rw-r--r--drivers/scsi/libfc/fc_disc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index 6125df787200..c1756b9b3ea5 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -287,9 +287,11 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
* discovery, reverify or log them in. Otherwise, log them out.
* Skip ports which were never discovered. These are the dNS port
* and ports which were created by PLOGI.
+ *
+ * We don't need to use the _rcu variant here as the rport list
+ * is protected by the disc mutex which is already held on entry.
*/
- rcu_read_lock();
- list_for_each_entry_rcu(rdata, &disc->rports, peers) {
+ list_for_each_entry(rdata, &disc->rports, peers) {
if (!kref_get_unless_zero(&rdata->kref))
continue;
if (rdata->disc_id) {
@@ -300,7 +302,6 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
}
kref_put(&rdata->kref, fc_rport_destroy);
}
- rcu_read_unlock();
mutex_unlock(&disc->disc_mutex);
disc->disc_callback(lport, event);
mutex_lock(&disc->disc_mutex);