scsi: mpi3mr: Fix race between config read submit and interrupt completion

commit e6327c4 upstream.

The "is_waiting" flag was updated after calling complete(), which could
lead to a race where the waiting thread wakes up before the flag is
cleared. This may cause a missed wakeup or stale state check.

Reorder the operations to update "is_waiting" before signaling completion
to ensure consistent state.

Fixes: 824a156 ("scsi: mpi3mr: Base driver code")
Cc: stable@vger.kernel.org
Co-developed-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20250627194539.48851-2-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Ranjan Kumar

drivers/scsi/mpi3mr/mpi3mr_fw.c

@@ -428,8 +428,8 @@ static void mpi3mr_process_admin_reply_desc(struct mpi3mr_ioc *mrioc,
 				       MPI3MR_SENSE_BUF_SZ);
 			}
 			if (cmdptr->is_waiting) {
-				complete(&cmdptr->done);
 				cmdptr->is_waiting = 0;
+				complete(&cmdptr->done);
 			} else if (cmdptr->callback)
 				cmdptr->callback(mrioc, cmdptr);
 		}