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scsi: lpfc: Fix a possible data race in lpfc_unregister_fcf_rescan()

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The variable phba->fcf.fcf_flag is often protected by the lock
phba->hbalock() when is accessed. Here is an example in
lpfc_unregister_fcf_rescan():

  spin_lock_irq(&phba->hbalock);
  phba->fcf.fcf_flag |= FCF_INIT_DISC;
  spin_unlock_irq(&phba->hbalock);

However, in the same function, phba->fcf.fcf_flag is assigned with 0
without holding the lock, and thus can cause a data race:

  phba->fcf.fcf_flag = 0;

To fix this possible data race, a lock and unlock pair is added when
accessing the variable phba->fcf.fcf_flag.

Reported-by: BassCheck <bass@buaa.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Link: https://lore.kernel.org/r/20230630024748.1035993-1-islituo@gmail.com
Reviewed-by: Justin Tee <justin.tee@broadcom.com>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tuo Li 2023-06-30 10:47:48 +08:00 committed by Martin K. Petersen
parent 24033d71cc
commit 0e881c0a4b
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/lpfc/lpfc_hbadisc.c
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@ -6944,7 +6944,9 @@ lpfc_unregister_fcf_rescan(struct lpfc_hba *phba)
if (rc)
return;
/* Reset HBA FCF states after successful unregister FCF */
spin_lock_irq(&phba->hbalock);
phba->fcf.fcf_flag = 0;
spin_unlock_irq(&phba->hbalock);
phba->fcf.current_rec.flag = 0;
/*