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List:       linux-scsi
Subject:    [PATCH 4/4] scsi: bfa: Rework bfad_reset_sdev_bflags()
From:       Bart Van Assche <bvanassche () acm ! org>
Date:       2022-10-31 22:47:28
Message-ID: 20221031224728.2607760-5-bvanassche () acm ! org
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Since commit f93ed747e2c7 ("scsi: core: Release SCSI devices
synchronously") it is no longer allowed to call scsi_device_put() from
atomic context. Hence this patch that reworks bfad_reset_sdev_bflags()
such that scsi_device_put() is no longer called. This patch fixes the
following smatch warning:

drivers/scsi/bfa/bfad_bsg.c:2551 bfad_iocmd_lunmask_reset_lunscan_mode() warn: sleeping in atomic context

bfad_iocmd_lunmask() <- disables preempt
-> bfad_iocmd_lunmask_reset_lunscan_mode()
   -> scsi_device_put()

Cc: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Cc: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/bfa/bfad_bsg.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/bfa/bfad_bsg.c b/drivers/scsi/bfa/bfad_bsg.c
index 73754032e25c..79d4f7ee5bcb 100644
--- a/drivers/scsi/bfa/bfad_bsg.c
+++ b/drivers/scsi/bfa/bfad_bsg.c
@@ -2553,18 +2553,20 @@ static void bfad_reset_sdev_bflags(struct bfad_im_port_s *im_port,
 	const u32 scan_flags = BLIST_NOREPORTLUN | BLIST_SPARSELUN;
 	struct bfad_itnim_s *itnim;
 	struct scsi_device *sdev;
+	unsigned long flags;
 
+	spin_lock_irqsave(im_port->shost->host_lock, flags);
 	list_for_each_entry(itnim, &im_port->itnim_mapped_list, list_entry) {
-		sdev = scsi_device_lookup(im_port->shost, itnim->channel,
-					  itnim->scsi_tgt_id, 0);
+		sdev = __scsi_device_lookup(im_port->shost, itnim->channel,
+					    itnim->scsi_tgt_id, 0);
 		if (sdev) {
 			if (lunmask_cfg == BFA_TRUE)
 				sdev->sdev_bflags |= scan_flags;
 			else
 				sdev->sdev_bflags &= ~scan_flags;
-			scsi_device_put(sdev);
 		}
 	}
+	spin_unlock_irqrestore(im_port->shost->host_lock, flags);
 }
 
 /* Function to reset the LUN SCAN mode */
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