ide: remove ->supports_dsc_overlap field from ide_driver_t

* Use drive->media and drive->scsi to check if ->dsc_overlap
  can be set by HDIO_SET_NICE ioctl in generic_ide_ioctl().

* Remove unused ->supports_dsc_overlap field from ide_driver_t.

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

7 files changed, 5 insertions, 12 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 1f5652326489..7ea90de55058 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1969,7 +1969,6 @@ static ide_driver_t ide_cdrom_driver = {
         .remove                 = ide_cd_remove,
         .version                = IDECD_VERSION,
         .media                  = ide_cdrom,
-        .supports_dsc_overlap   = 1,
         .do_request             = ide_cd_do_request,
         .end_request            = ide_end_request,
         .error                  = __ide_error,
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 474070c1ddb6..08f47cb13425 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -980,7 +980,6 @@ static ide_driver_t idedisk_driver = {
         .shutdown               = ide_device_shutdown,
         .version                = IDEDISK_VERSION,
         .media                  = ide_disk,
-        .supports_dsc_overlap   = 0,
         .do_request             = ide_do_rw_disk,
         .end_request            = ide_end_request,
         .error                  = __ide_error,
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 673644fdb6f2..de8d42b3f698 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1130,7 +1130,6 @@ static ide_driver_t idefloppy_driver = {
         .remove                 = ide_floppy_remove,
         .version                = IDEFLOPPY_VERSION,
         .media                  = ide_floppy,
-        .supports_dsc_overlap   = 0,
         .do_request             = idefloppy_do_request,
         .end_request            = idefloppy_end_request,
         .error                  = __ide_error,
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 7037accb0589..1fc1c2a6888f 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2607,7 +2607,6 @@ static ide_driver_t idetape_driver = {
         .remove                 = ide_tape_remove,
         .version                = IDETAPE_VERSION,
         .media                  = ide_tape,
-        .supports_dsc_overlap   = 1,
         .do_request             = idetape_do_request,
         .end_request            = idetape_end_request,
         .error                  = __ide_error,
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 5b3bfc78dcdd..4d0c661e78a5 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -562,7 +562,6 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
                         unsigned int cmd, unsigned long arg)
 {
         unsigned long flags;
-        ide_driver_t *drv;
         int err = 0, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int);
 
         switch (cmd) {
@@ -612,12 +611,12 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
                                 return -EPERM;
-                        drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
-                        drv = *(ide_driver_t **)bdev->bd_disk->private_data;
-                        if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
-                                drive->dsc_overlap = 0;
+                        if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
+                            (drive->media == ide_disk ||
+                             drive->media == ide_floppy ||
+                             drive->scsi))
                                 return -EPERM;
-                        }
+                        drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
                         return 0;
                 case HDIO_DRIVE_RESET:
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 65cf84b222c5..a2d003c5e85f 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -522,7 +522,6 @@ static ide_driver_t idescsi_driver = {
         .remove                 = ide_scsi_remove,
         .version                = IDESCSI_VERSION,
         .media                  = ide_scsi,
-        .supports_dsc_overlap   = 0,
         .do_request             = idescsi_do_request,
         .end_request            = idescsi_end_request,
         .error                  = idescsi_atapi_error,
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 9cb935f2e7ce..e5622bb5a4a1 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -912,7 +912,6 @@ enum {
 struct ide_driver_s {
         const char                      *version;
         u8                              media;
-        unsigned supports_dsc_overlap   : 1;
         ide_startstop_t (*do_request)(ide_drive_t *, struct request *, sector_t);
         int             (*end_request)(ide_drive_t *, int, int);
         ide_startstop_t (*error)(ide_drive_t *, struct request *rq, u8, u8);