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cdrom: Make device operations read-only
[karo-tx-linux.git] / drivers / cdrom / cdrom.c
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 59cca72647a623dad42465c08021bb9f818933b8..bbbd3caa927c125c150472a53b1e36a9a78eba97 100644 (file)
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -342,8 +342,8 @@ static void cdrom_sysctl_register(void);
 
 static LIST_HEAD(cdrom_list);
 
-static int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
-                                     struct packet_command *cgc)
+int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
+                              struct packet_command *cgc)
 {
        if (cgc->sense) {
                cgc->sense->sense_key = 0x05;
@@ -354,6 +354,7 @@ static int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
        cgc->stat = -EIO;
        return -EIO;
 }
+EXPORT_SYMBOL(cdrom_dummy_generic_packet);
 
 static int cdrom_flush_cache(struct cdrom_device_info *cdi)
 {
@@ -371,7 +372,7 @@ static int cdrom_flush_cache(struct cdrom_device_info *cdi)
 static int cdrom_get_disc_info(struct cdrom_device_info *cdi,
                               disc_information *di)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct packet_command cgc;
        int ret, buflen;
 
@@ -586,7 +587,7 @@ static int cdrom_mrw_set_lba_space(struct cdrom_device_info *cdi, int space)
 int register_cdrom(struct cdrom_device_info *cdi)
 {
        static char banner_printed;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        int *change_capability = (int *)&cdo->capability; /* hack */
 
        cd_dbg(CD_OPEN, "entering register_cdrom\n");
@@ -610,7 +611,6 @@ int register_cdrom(struct cdrom_device_info *cdi)
        ENSURE(reset, CDC_RESET);
        ENSURE(generic_packet, CDC_GENERIC_PACKET);
        cdi->mc_flags = 0;
-       cdo->n_minors = 0;
        cdi->options = CDO_USE_FFLAGS;
 
        if (autoclose == 1 && CDROM_CAN(CDC_CLOSE_TRAY))
@@ -630,8 +630,7 @@ int register_cdrom(struct cdrom_device_info *cdi)
        else
                cdi->cdda_method = CDDA_OLD;
 
-       if (!cdo->generic_packet)
-               cdo->generic_packet = cdrom_dummy_generic_packet;
+       WARN_ON(!cdo->generic_packet);
 
        cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
        mutex_lock(&cdrom_mutex);
@@ -652,7 +651,6 @@ void unregister_cdrom(struct cdrom_device_info *cdi)
        if (cdi->exit)
                cdi->exit(cdi);
 
-       cdi->ops->n_minors--;
        cd_dbg(CD_REG_UNREG, "drive \"/dev/%s\" unregistered\n", cdi->name);
 }
 
@@ -1036,7 +1034,7 @@ static
 int open_for_data(struct cdrom_device_info *cdi)
 {
        int ret;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        tracktype tracks;
        cd_dbg(CD_OPEN, "entering open_for_data\n");
        /* Check if the driver can report drive status.  If it can, we
@@ -1198,8 +1196,8 @@ err:
 /* This code is similar to that in open_for_data. The routine is called
    whenever an audio play operation is requested.
 */
-static int check_for_audio_disc(struct cdrom_device_info * cdi,
-                               struct cdrom_device_ops * cdo)
+static int check_for_audio_disc(struct cdrom_device_info *cdi,
+                               const struct cdrom_device_ops *cdo)
 {
         int ret;
        tracktype tracks;
@@ -1254,7 +1252,7 @@ static int check_for_audio_disc(struct cdrom_device_info * cdi,
 
 void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        int opened_for_data;
 
        cd_dbg(CD_CLOSE, "entering cdrom_release\n");
@@ -1294,7 +1292,7 @@ static int cdrom_read_mech_status(struct cdrom_device_info *cdi,
                                  struct cdrom_changer_info *buf)
 {
        struct packet_command cgc;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        int length;
 
        /*
@@ -1643,7 +1641,7 @@ static int dvd_do_auth(struct cdrom_device_info *cdi, dvd_authinfo *ai)
        int ret;
        u_char buf[20];
        struct packet_command cgc;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        rpc_state_t rpc_state;
 
        memset(buf, 0, sizeof(buf));
@@ -1791,7 +1789,7 @@ static int dvd_read_physical(struct cdrom_device_info *cdi, dvd_struct *s,
 {
        unsigned char buf[21], *base;
        struct dvd_layer *layer;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        int ret, layer_num = s->physical.layer_num;
 
        if (layer_num >= DVD_LAYERS)
@@ -1842,7 +1840,7 @@ static int dvd_read_copyright(struct cdrom_device_info *cdi, dvd_struct *s,
 {
        int ret;
        u_char buf[8];
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        init_cdrom_command(cgc, buf, sizeof(buf), CGC_DATA_READ);
        cgc->cmd[0] = GPCMD_READ_DVD_STRUCTURE;
@@ -1866,7 +1864,7 @@ static int dvd_read_disckey(struct cdrom_device_info *cdi, dvd_struct *s,
 {
        int ret, size;
        u_char *buf;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        size = sizeof(s->disckey.value) + 4;
 
@@ -1894,7 +1892,7 @@ static int dvd_read_bca(struct cdrom_device_info *cdi, dvd_struct *s,
 {
        int ret, size = 4 + 188;
        u_char *buf;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        buf = kmalloc(size, GFP_KERNEL);
        if (!buf)
@@ -1928,7 +1926,7 @@ static int dvd_read_manufact(struct cdrom_device_info *cdi, dvd_struct *s,
 {
        int ret = 0, size;
        u_char *buf;
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        size = sizeof(s->manufact.value) + 4;
 
@@ -1995,7 +1993,7 @@ int cdrom_mode_sense(struct cdrom_device_info *cdi,
                     struct packet_command *cgc,
                     int page_code, int page_control)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        memset(cgc->cmd, 0, sizeof(cgc->cmd));
 
@@ -2010,7 +2008,7 @@ int cdrom_mode_sense(struct cdrom_device_info *cdi,
 int cdrom_mode_select(struct cdrom_device_info *cdi,
                      struct packet_command *cgc)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        memset(cgc->cmd, 0, sizeof(cgc->cmd));
        memset(cgc->buffer, 0, 2);
@@ -2025,7 +2023,7 @@ int cdrom_mode_select(struct cdrom_device_info *cdi,
 static int cdrom_read_subchannel(struct cdrom_device_info *cdi,
                                 struct cdrom_subchnl *subchnl, int mcn)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct packet_command cgc;
        char buffer[32];
        int ret;
@@ -2073,7 +2071,7 @@ static int cdrom_read_cd(struct cdrom_device_info *cdi,
                         struct packet_command *cgc, int lba,
                         int blocksize, int nblocks)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        memset(&cgc->cmd, 0, sizeof(cgc->cmd));
        cgc->cmd[0] = GPCMD_READ_10;
@@ -2093,7 +2091,7 @@ static int cdrom_read_block(struct cdrom_device_info *cdi,
                            struct packet_command *cgc,
                            int lba, int nblocks, int format, int blksize)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
 
        memset(&cgc->cmd, 0, sizeof(cgc->cmd));
        cgc->cmd[0] = GPCMD_READ_CD;
@@ -2764,7 +2762,7 @@ static int cdrom_ioctl_audioctl(struct cdrom_device_info *cdi,
  */
 static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct packet_command cgc;
        struct modesel_head mh;
 
@@ -2790,7 +2788,7 @@ static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
 static int cdrom_get_track_info(struct cdrom_device_info *cdi,
                                __u16 track, __u8 type, track_information *ti)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct packet_command cgc;
        int ret, buflen;
 
@@ -3049,7 +3047,7 @@ static noinline int mmc_ioctl_cdrom_play_msf(struct cdrom_device_info *cdi,
                                             void __user *arg,
                                             struct packet_command *cgc)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct cdrom_msf msf;
        cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
        if (copy_from_user(&msf, (struct cdrom_msf __user *)arg, sizeof(msf)))
@@ -3069,7 +3067,7 @@ static noinline int mmc_ioctl_cdrom_play_blk(struct cdrom_device_info *cdi,
                                             void __user *arg,
                                             struct packet_command *cgc)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        struct cdrom_blk blk;
        cd_dbg(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
        if (copy_from_user(&blk, (struct cdrom_blk __user *)arg, sizeof(blk)))
@@ -3164,7 +3162,7 @@ static noinline int mmc_ioctl_cdrom_start_stop(struct cdrom_device_info *cdi,
                                               struct packet_command *cgc,
                                               int cmd)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        cd_dbg(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n");
        cgc->cmd[0] = GPCMD_START_STOP_UNIT;
        cgc->cmd[1] = 1;
@@ -3177,7 +3175,7 @@ static noinline int mmc_ioctl_cdrom_pause_resume(struct cdrom_device_info *cdi,
                                                 struct packet_command *cgc,
                                                 int cmd)
 {
-       struct cdrom_device_ops *cdo = cdi->ops;
+       const struct cdrom_device_ops *cdo = cdi->ops;
        cd_dbg(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n");
        cgc->cmd[0] = GPCMD_PAUSE_RESUME;
        cgc->cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
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