[PATCH 1/6] ide-cd: Drop unused sense buffers

Kees Cook
2018-05-22T18:17:00Z

This drops unused sense buffers from:

cdrom_eject()
cdrom_read_capacity()
cdrom_read_tocentry()
ide_cd_lockdoor()
ide_cd_read_toc()

Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/ide/ide-cd.c | 36 +++++++++++++++---------------------
drivers/ide/ide-cd.h | 2 +-
drivers/ide/ide-cd_ioctl.c | 34 ++++++++++++----------------------
3 files changed, 28 insertions(+), 44 deletions(-)

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 5a8e8e3c22cd..1d5b35312e33 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -890,8 +890,7 @@ int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
}

static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
- unsigned long *sectors_per_frame,
- struct request_sense *sense)
+ unsigned long *sectors_per_frame)
{
struct {
__be32 lba;
@@ -908,7 +907,7 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
memset(cmd, 0, BLK_MAX_CDB);
cmd[0] = GPCMD_READ_CDVD_CAPACITY;

- stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
+ stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, NULL, 0,
RQF_QUIET);
if (stat)
return stat;
@@ -944,8 +943,7 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
}

static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
- int format, char *buf, int buflen,
- struct request_sense *sense)
+ int format, char *buf, int buflen)
{
unsigned char cmd[BLK_MAX_CDB];

@@ -962,11 +960,11 @@ static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
if (msf_flag)
cmd[1] = 2;

- return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, RQF_QUIET);
+ return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, NULL, 0, RQF_QUIET);
}

/* Try to read the entire TOC for the disk into our internal buffer. */
-int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
+int ide_cd_read_toc(ide_drive_t *drive)
{
int stat, ntracks, i;
struct cdrom_info *info = drive->driver_data;
@@ -996,14 +994,13 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
* Check to see if the existing data is still valid. If it is,
* just return.
*/
- (void) cdrom_check_status(drive, sense);
+ (void) cdrom_check_status(drive, NULL);

if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)
return 0;

/* try to get the total cdrom capacity and sector size */
- stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
- sense);
+ stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame);
if (stat)
toc->capacity = 0x1fffff;

@@ -1016,7 +1013,7 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)

/* first read just the header, so we know how long the TOC is */
stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
- sizeof(struct atapi_toc_header), sense);
+ sizeof(struct atapi_toc_header));
if (stat)
return stat;

@@ -1036,7 +1033,7 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
(char *)&toc->hdr,
sizeof(struct atapi_toc_header) +
(ntracks + 1) *
- sizeof(struct atapi_toc_entry), sense);
+ sizeof(struct atapi_toc_entry));

if (stat && toc->hdr.first_track > 1) {
/*
@@ -1056,8 +1053,7 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
(char *)&toc->hdr,
sizeof(struct atapi_toc_header) +
(ntracks + 1) *
- sizeof(struct atapi_toc_entry),
- sense);
+ sizeof(struct atapi_toc_entry));
if (stat)
return stat;

@@ -1094,7 +1090,7 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
if (toc->hdr.first_track != CDROM_LEADOUT) {
/* read the multisession information */
stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
- sizeof(ms_tmp), sense);
+ sizeof(ms_tmp));
if (stat)
return stat;

@@ -1108,7 +1104,7 @@ int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)
if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
/* re-read multisession information using MSF format */
stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
- sizeof(ms_tmp), sense);
+ sizeof(ms_tmp));
if (stat)
return stat;

@@ -1412,7 +1408,7 @@ static sector_t ide_cdrom_capacity(ide_drive_t *drive)
{
unsigned long capacity, sectors_per_frame;

- if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
+ if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame))
return 0;

return capacity * sectors_per_frame;
@@ -1723,9 +1719,8 @@ static unsigned int idecd_check_events(struct gendisk *disk,
static int idecd_revalidate_disk(struct gendisk *disk)
{
struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
- struct request_sense sense;

- ide_cd_read_toc(info->drive, &sense);
+ ide_cd_read_toc(info->drive);

return 0;
}
@@ -1749,7 +1744,6 @@ static int ide_cd_probe(ide_drive_t *drive)
{
struct cdrom_info *info;
struct gendisk *g;
- struct request_sense sense;

ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
drive->driver_req, drive->media);
@@ -1798,7 +1792,7 @@ static int ide_cd_probe(ide_drive_t *drive)
goto failed;
}

- ide_cd_read_toc(drive, &sense);
+ ide_cd_read_toc(drive);
g->fops = &idecd_ops;
g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
device_add_disk(&drive->gendev, g);
diff --git a/drivers/ide/ide-cd.h b/drivers/ide/ide-cd.h
index 04f0f310a856..fc162fbb6629 100644
--- a/drivers/ide/ide-cd.h
+++ b/drivers/ide/ide-cd.h
@@ -99,7 +99,7 @@ void ide_cd_log_error(const char *, struct request *, struct request_sense *);
/* ide-cd.c functions used by ide-cd_ioctl.c */
int ide_cd_queue_pc(ide_drive_t *, const unsigned char *, int, void *,
unsigned *, struct request_sense *, int, req_flags_t);
-int ide_cd_read_toc(ide_drive_t *, struct request_sense *);
+int ide_cd_read_toc(ide_drive_t *);
int ide_cdrom_get_capabilities(ide_drive_t *, u8 *);
void ide_cdrom_update_speed(ide_drive_t *, u8 *);
int cdrom_check_status(ide_drive_t *, struct request_sense *);
diff --git a/drivers/ide/ide-cd_ioctl.c b/drivers/ide/ide-cd_ioctl.c
index 2acca12b9c94..c709f4eed0e9 100644
--- a/drivers/ide/ide-cd_ioctl.c
+++ b/drivers/ide/ide-cd_ioctl.c
@@ -105,8 +105,7 @@ unsigned int ide_cdrom_check_events_real(struct cdrom_device_info *cdi,
/* Eject the disk if EJECTFLAG is 0.
If EJECTFLAG is 1, try to reload the disk. */
static
-int cdrom_eject(ide_drive_t *drive, int ejectflag,
- struct request_sense *sense)
+int cdrom_eject(ide_drive_t *drive, int ejectflag)
{
struct cdrom_info *cd = drive->driver_data;
struct cdrom_device_info *cdi = &cd->devinfo;
@@ -129,20 +128,16 @@ int cdrom_eject(ide_drive_t *drive, int ejectflag,
cmd[0] = GPCMD_START_STOP_UNIT;
cmd[4] = loej | (ejectflag != 0);

- return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, 0);
+ return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, NULL, 0, 0);
}

/* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */
static
-int ide_cd_lockdoor(ide_drive_t *drive, int lockflag,
- struct request_sense *sense)
+int ide_cd_lockdoor(ide_drive_t *drive, int lockflag)
{
- struct request_sense my_sense;
+ struct request_sense my_sense, *sense = &my_sense;
int stat;

- if (sense == NULL)
- sense = &my_sense;
-
/* If the drive cannot lock the door, just pretend. */
if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) {
stat = 0;
@@ -186,23 +181,22 @@ int ide_cd_lockdoor(ide_drive_t *drive, int lockflag,
int ide_cdrom_tray_move(struct cdrom_device_info *cdi, int position)
{
ide_drive_t *drive = cdi->handle;
- struct request_sense sense;

if (position) {
- int stat = ide_cd_lockdoor(drive, 0, &sense);
+ int stat = ide_cd_lockdoor(drive, 0);

if (stat)
return stat;
}

- return cdrom_eject(drive, !position, &sense);
+ return cdrom_eject(drive, !position);
}

int ide_cdrom_lock_door(struct cdrom_device_info *cdi, int lock)
{
ide_drive_t *drive = cdi->handle;

- return ide_cd_lockdoor(drive, lock, NULL);
+ return ide_cd_lockdoor(drive, lock);
}

/*
@@ -213,7 +207,6 @@ int ide_cdrom_select_speed(struct cdrom_device_info *cdi, int speed)
{
ide_drive_t *drive = cdi->handle;
struct cdrom_info *cd = drive->driver_data;
- struct request_sense sense;
u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
int stat;
unsigned char cmd[BLK_MAX_CDB];
@@ -236,7 +229,7 @@ int ide_cdrom_select_speed(struct cdrom_device_info *cdi, int speed)
cmd[5] = speed & 0xff;
}

- stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
+ stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, NULL, 0, 0);

if (!ide_cdrom_get_capabilities(drive, buf)) {
ide_cdrom_update_speed(drive, buf);
@@ -252,11 +245,10 @@ int ide_cdrom_get_last_session(struct cdrom_device_info *cdi,
struct atapi_toc *toc;
ide_drive_t *drive = cdi->handle;
struct cdrom_info *info = drive->driver_data;
- struct request_sense sense;
int ret;

if ((drive->atapi_flags & IDE_AFLAG_TOC_VALID) == 0 || !info->toc) {
- ret = ide_cd_read_toc(drive, &sense);
+ ret = ide_cd_read_toc(drive);
if (ret)
return ret;
}
@@ -300,7 +292,6 @@ int ide_cdrom_reset(struct cdrom_device_info *cdi)
{
ide_drive_t *drive = cdi->handle;
struct cdrom_info *cd = drive->driver_data;
- struct request_sense sense;
struct request *rq;
int ret;

@@ -315,7 +306,7 @@ int ide_cdrom_reset(struct cdrom_device_info *cdi)
* lock it again.
*/
if (drive->atapi_flags & IDE_AFLAG_DOOR_LOCKED)
- (void)ide_cd_lockdoor(drive, 1, &sense);
+ (void)ide_cd_lockdoor(drive, 1);

return ret;
}
@@ -355,7 +346,6 @@ static int ide_cd_fake_play_trkind(ide_drive_t *drive, void *arg)
struct atapi_toc_entry *first_toc, *last_toc;
unsigned long lba_start, lba_end;
int stat;
- struct request_sense sense;
unsigned char cmd[BLK_MAX_CDB];

stat = ide_cd_get_toc_entry(drive, ti->cdti_trk0, &first_toc);
@@ -380,7 +370,7 @@ static int ide_cd_fake_play_trkind(ide_drive_t *drive, void *arg)
lba_to_msf(lba_start, &cmd[3], &cmd[4], &cmd[5]);
lba_to_msf(lba_end - 1, &cmd[6], &cmd[7], &cmd[8]);

- return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
+ return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, NULL, 0, 0);
}

static int ide_cd_read_tochdr(ide_drive_t *drive, void *arg)
@@ -391,7 +381,7 @@ static int ide_cd_read_tochdr(ide_drive_t *drive, void *arg)
int stat;

/* Make sure our saved TOC is valid. */
- stat = ide_cd_read_toc(drive, NULL);
+ stat = ide_cd_read_toc(drive);
if (stat)
return stat;

--
2.17.0