scsi: qla2xxx: Remove unused nvme_ls_waitq wait queue

BugLink: https://bugs.launchpad.net/bugs/2036075

commit 20fce50 upstream.

System crash when qla2x00_start_sp(sp) returns error code EGAIN and wake_up
gets called for uninitialized wait queue sp->nvme_ls_waitq.

    qla2xxx [0000:37:00.1]-2121:5: Returning existing qpair of ffff8ae2c0513400 for idx=0
    qla2xxx [0000:37:00.1]-700e:5: qla2x00_start_sp failed = 11
    BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
    PGD 0 P4D 0
    Oops: 0000 [#1] SMP NOPTI
    Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 09/03/2021
    Workqueue: nvme-wq nvme_fc_connect_ctrl_work [nvme_fc]
    RIP: 0010:__wake_up_common+0x4c/0x190
    RSP: 0018:ffff95f3e0cb7cd0 EFLAGS: 00010086
    RAX: 0000000000000000 RBX: ffff8b08d3b26328 RCX: 0000000000000000
    RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8b08d3b26320
    RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffffffffffe8
    R10: 0000000000000000 R11: ffff95f3e0cb7a60 R12: ffff95f3e0cb7d20
    R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
    FS:  0000000000000000(0000) GS:ffff8b2fdf6c0000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 0000002f1e410002 CR4: 00000000007706e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    PKRU: 55555554
    Call Trace:
     __wake_up_common_lock+0x7c/0xc0
     qla_nvme_ls_req+0x355/0x4c0 [qla2xxx]
     ? __nvme_fc_send_ls_req+0x260/0x380 [nvme_fc]
     ? nvme_fc_send_ls_req.constprop.42+0x1a/0x45 [nvme_fc]
     ? nvme_fc_connect_ctrl_work.cold.63+0x1e3/0xa7d [nvme_fc]

Remove unused nvme_ls_waitq wait queue. nvme_ls_waitq logic was removed
previously in the commits tagged Fixed: below.

Fixes: 219d27d ("scsi: qla2xxx: Fix race conditions in the code for aborting SCSI commands")
Fixes: 5621b0d ("scsi: qla2xxx: Simpify unregistration of FC-NVMe local/remote ports")
Cc: [email protected]
Signed-off-by: Manish Rangankar <[email protected]>
Signed-off-by: Nilesh Javali <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>

Author: mrangankar

drivers/scsi/qla2xxx/qla_def.h

@@ -695,7 +695,6 @@ typedef struct srb {
 	struct iocb_resource iores;
 	struct kref cmd_kref;	/* need to migrate ref_count over to this */
 	void *priv;
-	wait_queue_head_t nvme_ls_waitq;
 	struct fc_port *fcport;
 	struct scsi_qla_host *vha;
 	unsigned int start_timer:1;

drivers/scsi/qla2xxx/qla_nvme.c

@@ -360,7 +360,6 @@ static int qla_nvme_ls_req(struct nvme_fc_local_port *lport,
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x700e,
 		    "qla2x00_start_sp failed = %d\n", rval);
-		wake_up(&sp->nvme_ls_waitq);
 		sp->priv = NULL;
 		priv->sp = NULL;
 		qla2x00_rel_sp(sp);
@@ -648,7 +647,6 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
 	if (!sp)
 		return -EBUSY;
 
-	init_waitqueue_head(&sp->nvme_ls_waitq);
 	kref_init(&sp->cmd_kref);
 	spin_lock_init(&priv->cmd_lock);
 	sp->priv = priv;
@@ -667,7 +665,6 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x212d,
 		    "qla2x00_start_nvme_mq failed = %d\n", rval);
-		wake_up(&sp->nvme_ls_waitq);
 		sp->priv = NULL;
 		priv->sp = NULL;
 		qla2xxx_rel_qpair_sp(sp->qpair, sp);