[PATCH] arcmsr: Fix possible sleep-in-atomic bugs in arcmsr_queue_command

[Jia-Ju Bai]

The driver may sleep under a spinlock, and the function call paths are:
arcmsr_queue_command(acquire the spinlock)
  arcmsr_queue_command_lck
    arcmsr_handle_virtual_command
      arcmsr_iop_message_xfer
        arcmsr_iop_parking
          arcmsr_stop_adapter_bgrb
            arcmsr_hbaA_stop_bgrb
              arcmsr_hbaA_wait_msgint_ready
                msleep --> may sleep

arcmsr_queue_command(acquire the spinlock)
  arcmsr_queue_command_lck
    arcmsr_handle_virtual_command
      arcmsr_iop_message_xfer
        arcmsr_iop_parking
          arcmsr_stop_adapter_bgrb
            arcmsr_hbaB_stop_bgrb
              arcmsr_hbaB_wait_msgint_ready
                msleep --> may sleep

arcmsr_queue_command(acquire the spinlock)
  arcmsr_queue_command_lck
    arcmsr_handle_virtual_command
      arcmsr_iop_message_xfer
        arcmsr_iop_parking
          arcmsr_stop_adapter_bgrb
            arcmsr_hbaC_stop_bgrb
              arcmsr_hbaC_wait_msgint_ready
                msleep --> may sleep

arcmsr_queue_command(acquire the spinlock)
  arcmsr_queue_command_lck
    arcmsr_handle_virtual_command
      arcmsr_iop_message_xfer
        arcmsr_iop_parking
          arcmsr_stop_adapter_bgrb
            arcmsr_hbaD_stop_bgrb
              arcmsr_hbaD_wait_msgint_ready
                msleep --> may sleep

To fix them, msleep is replaced with mdelay.
These bugs are found by my static analysis tool and my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1...@163.com>
---
 drivers/scsi/arcmsr/arcmsr_hba.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index af032c4..31d94bd 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -347,7 +347,7 @@ static uint8_t arcmsr_hbaA_wait_msgint_ready(struct 
AdapterControlBlock *acb)
                                &reg->outbound_intstatus);
                        return true;
                }
-               msleep(10);
+               mdelay(10);
        } /* max 20 seconds */
 
        return false;
@@ -367,7 +367,7 @@ static uint8_t arcmsr_hbaB_wait_msgint_ready(struct 
AdapterControlBlock *acb)
                                        reg->drv2iop_doorbell);
                        return true;
                }
-               msleep(10);
+               mdelay(10);
        } /* max 20 seconds */
 
        return false;
@@ -385,7 +385,7 @@ static uint8_t arcmsr_hbaC_wait_msgint_ready(struct 
AdapterControlBlock *pACB)
                                &phbcmu->outbound_doorbell_clear); /*clear 
interrupt*/
                        return true;
                }
-               msleep(10);
+               mdelay(10);
        } /* max 20 seconds */
 
        return false;
@@ -403,7 +403,7 @@ static bool arcmsr_hbaD_wait_msgint_ready(struct 
AdapterControlBlock *pACB)
                                reg->outbound_doorbell);
                        return true;
                }
-               msleep(10);
+               mdelay(10);
        } /* max 20 seconds */
        return false;
 }
-- 
1.7.9.5