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scsi: mpt3sas: Fix a locking bug in an error path

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Call mutex_unlock(&ioc->hostdiag_unlock_mutex) once from error paths
instead of twice.

This patch fixes the following Clang -Wthread-safety errors:

drivers/scsi/mpt3sas/mpt3sas_base.c:8085:2: error: mutex 'ioc->hostdiag_unlock_mutex' is not held on every path through here [-Werror,-Wthread-safety-analysis]
 8085 |         pci_cfg_access_unlock(ioc->pdev);
      |         ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8019:2: note: mutex acquired here
 8019 |         mutex_lock(&ioc->hostdiag_unlock_mutex);
      |         ^
./include/linux/mutex.h:171:26: note: expanded from macro 'mutex_lock'
  171 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
      |                          ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8085:2: error: mutex 'ioc->hostdiag_unlock_mutex' is not held on every path through here [-Werror,-Wthread-safety-analysis]
 8085 |         pci_cfg_access_unlock(ioc->pdev);
      |         ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8019:2: note: mutex acquired here
 8019 |         mutex_lock(&ioc->hostdiag_unlock_mutex);
      |         ^
./include/linux/mutex.h:171:26: note: expanded from macro 'mutex_lock'
  171 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
      |                          ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8087:2: error: releasing mutex 'ioc->hostdiag_unlock_mutex' that was not held [-Werror,-Wthread-safety-analysis]
 8087 |         mutex_unlock(&ioc->hostdiag_unlock_mutex);
      |         ^

Cc: Ranjan Kumar <ranjan.kumar@broadcom.com>
Fixes: c0767560b0 ("scsi: mpt3sas: Reload SBR without rebooting HBA")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20250210203936.2946494-3-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
2025-02-10 12:39:36 -08:00
committed by Martin K. Petersen
parent c733741ae1
commit 38afcf0660
1 changed files with 7 additions and 5 deletions
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12
drivers/scsi/mpt3sas/mpt3sas_base.c
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@@ -8018,7 +8018,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
mutex_lock(&ioc->hostdiag_unlock_mutex);
if (mpt3sas_base_unlock_and_get_host_diagnostic(ioc, &host_diagnostic))
goto out;
goto unlock;
hcb_size = ioc->base_readl(&ioc->chip->HCBSize);
drsprintk(ioc, ioc_info(ioc, "diag reset: issued\n"));
@@ -8038,7 +8038,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
ioc_info(ioc,
"Invalid host diagnostic register value\n");
_base_dump_reg_set(ioc);
goto out;
goto unlock;
}
if (!(host_diagnostic & MPI2_DIAG_RESET_ADAPTER))
break;
@@ -8074,17 +8074,19 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
ioc_err(ioc, "%s: failed going to ready state (ioc_state=0x%x)\n",
__func__, ioc_state);
_base_dump_reg_set(ioc);
goto out;
goto fail;
}
pci_cfg_access_unlock(ioc->pdev);
ioc_info(ioc, "diag reset: SUCCESS\n");
return 0;
out:
unlock:
mutex_unlock(&ioc->hostdiag_unlock_mutex);
fail:
pci_cfg_access_unlock(ioc->pdev);
ioc_err(ioc, "diag reset: FAILED\n");
mutex_unlock(&ioc->hostdiag_unlock_mutex);
return -EFAULT;
}