DAC960: push down BKL

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Richard Knutsson <ricknu-0@student.ltu.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 101 insertions, 56 deletions

diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index cd03473f3547..a002a381df92 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -6628,15 +6628,18 @@ static void DAC960_DestroyProcEntries(DAC960_Controller_T *Controller)
  * DAC960_gam_ioctl is the ioctl function for performing RAID operations.
 */
 
-static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
-                            unsigned int Request, unsigned long Argument)
+static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
+                                                unsigned long Argument)
 {
-  int ErrorCode = 0;
+  long ErrorCode = 0;
   if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+
+  lock_kernel();
   switch (Request)
     {
     case DAC960_IOCTL_GET_CONTROLLER_COUNT:
-      return DAC960_ControllerCount;
+      ErrorCode = DAC960_ControllerCount;
+      break;
     case DAC960_IOCTL_GET_CONTROLLER_INFO:
       {
         DAC960_ControllerInfo_T __user *UserSpaceControllerInfo =
@@ -6644,15 +6647,20 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         DAC960_ControllerInfo_T ControllerInfo;
         DAC960_Controller_T *Controller;
         int ControllerNumber;
-        if (UserSpaceControllerInfo == NULL) return -EINVAL;
-        ErrorCode = get_user(ControllerNumber,
+        if (UserSpaceControllerInfo == NULL)
+                ErrorCode = -EINVAL;
+        else ErrorCode = get_user(ControllerNumber,
                              &UserSpaceControllerInfo->ControllerNumber);
-        if (ErrorCode != 0) return ErrorCode;
+        if (ErrorCode != 0)
+                break;;
+        ErrorCode = -ENXIO;
         if (ControllerNumber < 0 ||
-            ControllerNumber > DAC960_ControllerCount - 1)
-          return -ENXIO;
+            ControllerNumber > DAC960_ControllerCount - 1) {
+          break;
+        }
         Controller = DAC960_Controllers[ControllerNumber];
-        if (Controller == NULL) return -ENXIO;
+        if (Controller == NULL)
+                break;;
         memset(&ControllerInfo, 0, sizeof(DAC960_ControllerInfo_T));
         ControllerInfo.ControllerNumber = ControllerNumber;
         ControllerInfo.FirmwareType = Controller->FirmwareType;
@@ -6665,8 +6673,9 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         ControllerInfo.PCI_Address = Controller->PCI_Address;
         strcpy(ControllerInfo.ModelName, Controller->ModelName);
         strcpy(ControllerInfo.FirmwareVersion, Controller->FirmwareVersion);
-        return (copy_to_user(UserSpaceControllerInfo, &ControllerInfo,
+        ErrorCode = (copy_to_user(UserSpaceControllerInfo, &ControllerInfo,
                              sizeof(DAC960_ControllerInfo_T)) ? -EFAULT : 0);
+        break;
       }
     case DAC960_IOCTL_V1_EXECUTE_COMMAND:
       {
@@ -6684,30 +6693,39 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         int ControllerNumber, DataTransferLength;
         unsigned char *DataTransferBuffer = NULL;
         dma_addr_t DataTransferBufferDMA;
-        if (UserSpaceUserCommand == NULL) return -EINVAL;
+        if (UserSpaceUserCommand == NULL) {
+                ErrorCode = -EINVAL;
+                break;
+        }
         if (copy_from_user(&UserCommand, UserSpaceUserCommand,
                                    sizeof(DAC960_V1_UserCommand_T))) {
                 ErrorCode = -EFAULT;
-                goto Failure1a;
+                break;
         }
         ControllerNumber = UserCommand.ControllerNumber;
+        ErrorCode = -ENXIO;
         if (ControllerNumber < 0 ||
             ControllerNumber > DAC960_ControllerCount - 1)
-          return -ENXIO;
+                break;
         Controller = DAC960_Controllers[ControllerNumber];
-        if (Controller == NULL) return -ENXIO;
-        if (Controller->FirmwareType != DAC960_V1_Controller) return -EINVAL;
+        if (Controller == NULL)
+                break;
+        ErrorCode = -EINVAL;
+        if (Controller->FirmwareType != DAC960_V1_Controller)
+                break;
         CommandOpcode = UserCommand.CommandMailbox.Common.CommandOpcode;
         DataTransferLength = UserCommand.DataTransferLength;
-        if (CommandOpcode & 0x80) return -EINVAL;
+        if (CommandOpcode & 0x80)
+                break;
         if (CommandOpcode == DAC960_V1_DCDB)
           {
             if (copy_from_user(&DCDB, UserCommand.DCDB,
                                sizeof(DAC960_V1_DCDB_T))) {
                 ErrorCode = -EFAULT;
-                goto Failure1a;
+                break;
             }
-            if (DCDB.Channel >= DAC960_V1_MaxChannels) return -EINVAL;
+            if (DCDB.Channel >= DAC960_V1_MaxChannels)
+                        break;
             if (!((DataTransferLength == 0 &&
                    DCDB.Direction
                    == DAC960_V1_DCDB_NoDataTransfer) ||
@@ -6717,38 +6735,37 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
                   (DataTransferLength < 0 &&
                    DCDB.Direction
                    == DAC960_V1_DCDB_DataTransferSystemToDevice)))
-              return -EINVAL;
+                        break;
             if (((DCDB.TransferLengthHigh4 << 16) | DCDB.TransferLength)
                 != abs(DataTransferLength))
-              return -EINVAL;
+                        break;
             DCDB_IOBUF = pci_alloc_consistent(Controller->PCIDevice,
                         sizeof(DAC960_V1_DCDB_T), &DCDB_IOBUFDMA);
-            if (DCDB_IOBUF == NULL)
-                        return -ENOMEM;
+            if (DCDB_IOBUF == NULL) {
+                        ErrorCode = -ENOMEM;
+                        break;
+                }
           }
+        ErrorCode = -ENOMEM;
         if (DataTransferLength > 0)
           {
             DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
                                 DataTransferLength, &DataTransferBufferDMA);
-            if (DataTransferBuffer == NULL) {
-                ErrorCode = -ENOMEM;
-                goto Failure1;
-            }
+            if (DataTransferBuffer == NULL)
+                break;
             memset(DataTransferBuffer, 0, DataTransferLength);
           }
         else if (DataTransferLength < 0)
           {
             DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
                                 -DataTransferLength, &DataTransferBufferDMA);
-            if (DataTransferBuffer == NULL) {
-                ErrorCode = -ENOMEM;
-                goto Failure1;
-            }
+            if (DataTransferBuffer == NULL)
+                break;
             if (copy_from_user(DataTransferBuffer,
                                UserCommand.DataTransferBuffer,
                                -DataTransferLength)) {
                 ErrorCode = -EFAULT;
-                goto Failure1;
+                break;
             }
           }
         if (CommandOpcode == DAC960_V1_DCDB)
@@ -6825,8 +6842,7 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         if (DCDB_IOBUF != NULL)
           pci_free_consistent(Controller->PCIDevice, sizeof(DAC960_V1_DCDB_T),
                         DCDB_IOBUF, DCDB_IOBUFDMA);
-      Failure1a:
-        return ErrorCode;
+        break;
       }
     case DAC960_IOCTL_V2_EXECUTE_COMMAND:
       {
@@ -6844,32 +6860,43 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         dma_addr_t DataTransferBufferDMA;
         unsigned char *RequestSenseBuffer = NULL;
         dma_addr_t RequestSenseBufferDMA;
-        if (UserSpaceUserCommand == NULL) return -EINVAL;
+
+        ErrorCode = -EINVAL;
+        if (UserSpaceUserCommand == NULL)
+                break;
         if (copy_from_user(&UserCommand, UserSpaceUserCommand,
                            sizeof(DAC960_V2_UserCommand_T))) {
                 ErrorCode = -EFAULT;
-                goto Failure2a;
+                break;
         }
+        ErrorCode = -ENXIO;
         ControllerNumber = UserCommand.ControllerNumber;
         if (ControllerNumber < 0 ||
             ControllerNumber > DAC960_ControllerCount - 1)
-          return -ENXIO;
+                break;
         Controller = DAC960_Controllers[ControllerNumber];
-        if (Controller == NULL) return -ENXIO;
-        if (Controller->FirmwareType != DAC960_V2_Controller) return -EINVAL;
+        if (Controller == NULL)
+                break;
+        if (Controller->FirmwareType != DAC960_V2_Controller){
+                ErrorCode = -EINVAL;
+                break;
+        }
         DataTransferLength = UserCommand.DataTransferLength;
+        ErrorCode = -ENOMEM;
         if (DataTransferLength > 0)
           {
             DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
                                 DataTransferLength, &DataTransferBufferDMA);
-            if (DataTransferBuffer == NULL) return -ENOMEM;
+            if (DataTransferBuffer == NULL)
+                break;
             memset(DataTransferBuffer, 0, DataTransferLength);
           }
         else if (DataTransferLength < 0)
           {
             DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
                                 -DataTransferLength, &DataTransferBufferDMA);
-            if (DataTransferBuffer == NULL) return -ENOMEM;
+            if (DataTransferBuffer == NULL)
+                break;
             if (copy_from_user(DataTransferBuffer,
                                UserCommand.DataTransferBuffer,
                                -DataTransferLength)) {
@@ -6979,8 +7006,7 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         if (RequestSenseBuffer != NULL)
           pci_free_consistent(Controller->PCIDevice, RequestSenseLength,
                 RequestSenseBuffer, RequestSenseBufferDMA);
-      Failure2a:
-        return ErrorCode;
+        break;
       }
     case DAC960_IOCTL_V2_GET_HEALTH_STATUS:
       {
@@ -6990,21 +7016,33 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
         DAC960_V2_HealthStatusBuffer_T HealthStatusBuffer;
         DAC960_Controller_T *Controller;
         int ControllerNumber;
-        if (UserSpaceGetHealthStatus == NULL) return -EINVAL;
+        if (UserSpaceGetHealthStatus == NULL) {
+                ErrorCode = -EINVAL;
+                break;
+        }
         if (copy_from_user(&GetHealthStatus, UserSpaceGetHealthStatus,
-                           sizeof(DAC960_V2_GetHealthStatus_T)))
-                return -EFAULT;
+                           sizeof(DAC960_V2_GetHealthStatus_T))) {
+                ErrorCode = -EFAULT;
+                break;
+        }
+        ErrorCode = -ENXIO;
         ControllerNumber = GetHealthStatus.ControllerNumber;
         if (ControllerNumber < 0 ||
             ControllerNumber > DAC960_ControllerCount - 1)
-          return -ENXIO;
+                    break;
         Controller = DAC960_Controllers[ControllerNumber];
-        if (Controller == NULL) return -ENXIO;
-        if (Controller->FirmwareType != DAC960_V2_Controller) return -EINVAL;
+        if (Controller == NULL)
+                break;
+        if (Controller->FirmwareType != DAC960_V2_Controller) {
+                ErrorCode = -EINVAL;
+                break;
+        }
         if (copy_from_user(&HealthStatusBuffer,
                            GetHealthStatus.HealthStatusBuffer,
-                           sizeof(DAC960_V2_HealthStatusBuffer_T)))
-                return -EFAULT;
+                           sizeof(DAC960_V2_HealthStatusBuffer_T))) {
+                ErrorCode = -EFAULT;
+                break;
+        }
         while (Controller->V2.HealthStatusBuffer->StatusChangeCounter
                == HealthStatusBuffer.StatusChangeCounter &&
                Controller->V2.HealthStatusBuffer->NextEventSequenceNumber
@@ -7012,21 +7050,28 @@ static int DAC960_gam_ioctl(struct inode *inode, struct file *file,
           {
             interruptible_sleep_on_timeout(&Controller->HealthStatusWaitQueue,
                                            DAC960_MonitoringTimerInterval);
-            if (signal_pending(current)) return -EINTR;
+            if (signal_pending(current)) {
+                ErrorCode = -EINTR;
+                break;
+            }
           }
         if (copy_to_user(GetHealthStatus.HealthStatusBuffer,
                          Controller->V2.HealthStatusBuffer,
                          sizeof(DAC960_V2_HealthStatusBuffer_T)))
-                return -EFAULT;
-        return 0;
+                ErrorCode = -EFAULT;
+        else
+                ErrorCode =  0;
       }
+      default:
+        ErrorCode = -ENOTTY;
     }
-  return -EINVAL;
+  unlock_kernel();
+  return ErrorCode;
 }
 
 static const struct file_operations DAC960_gam_fops = {
         .owner          = THIS_MODULE,
-        .ioctl          = DAC960_gam_ioctl
+        .unlocked_ioctl = DAC960_gam_ioctl
 };
 
 static struct miscdevice DAC960_gam_dev = {