]> pilppa.com Git - linux-2.6-omap-h63xx.git/commitdiff
cdrom: split mmc_ioctl to lower stack usage
authorMarcin Slusarz <marcin.slusarz@gmail.com>
Sun, 16 Nov 2008 18:04:47 +0000 (19:04 +0100)
committerJens Axboe <jens.axboe@oracle.com>
Mon, 29 Dec 2008 07:28:42 +0000 (08:28 +0100)
Checkstack output:

Before:
mmc_ioctl:                  584

After:
mmc_ioctl_dvd_read_struct:  280
mmc_ioctl_cdrom_subchannel: 152
mmc_ioctl_cdrom_read_data:  120
mmc_ioctl_cdrom_volume:     104
mmc_ioctl_cdrom_read_audio: 104
(mmc_ioctl is inlined into cdrom_ioctl - 104 bytes)

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
drivers/cdrom/cdrom.c

index 7d2e91cccb13e99068a4499bc469ef9bc032c67b..b927aa244247fb7670567123915dd8ad2a94f38d 100644 (file)
@@ -2787,271 +2787,359 @@ static int cdrom_switch_blocksize(struct cdrom_device_info *cdi, int size)
        return cdo->generic_packet(cdi, &cgc);
 }
 
-static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
-                    unsigned long arg)
-{              
-       struct cdrom_device_ops *cdo = cdi->ops;
-       struct packet_command cgc;
+static noinline int mmc_ioctl_cdrom_read_data(struct cdrom_device_info *cdi,
+                                       void __user *arg,
+                                       struct packet_command *cgc,
+                                       int cmd)
+{
        struct request_sense sense;
-       unsigned char buffer[32];
-       int ret = 0;
-
-       memset(&cgc, 0, sizeof(cgc));
+       struct cdrom_msf msf;
+       int blocksize = 0, format = 0, lba;
+       int ret;
 
-       /* build a unified command and queue it through
-          cdo->generic_packet() */
        switch (cmd) {
        case CDROMREADRAW:
+               blocksize = CD_FRAMESIZE_RAW;
+               break;
        case CDROMREADMODE1:
-       case CDROMREADMODE2: {
-               struct cdrom_msf msf;
-               int blocksize = 0, format = 0, lba;
-               
-               switch (cmd) {
-               case CDROMREADRAW:
-                       blocksize = CD_FRAMESIZE_RAW;
-                       break;
-               case CDROMREADMODE1:
-                       blocksize = CD_FRAMESIZE;
-                       format = 2;
-                       break;
-               case CDROMREADMODE2:
-                       blocksize = CD_FRAMESIZE_RAW0;
-                       break;
-               }
-               IOCTL_IN(arg, struct cdrom_msf, msf);
-               lba = msf_to_lba(msf.cdmsf_min0,msf.cdmsf_sec0,msf.cdmsf_frame0);
-               /* FIXME: we need upper bound checking, too!! */
-               if (lba < 0)
-                       return -EINVAL;
-               cgc.buffer = kmalloc(blocksize, GFP_KERNEL);
-               if (cgc.buffer == NULL)
-                       return -ENOMEM;
-               memset(&sense, 0, sizeof(sense));
-               cgc.sense = &sense;
-               cgc.data_direction = CGC_DATA_READ;
-               ret = cdrom_read_block(cdi, &cgc, lba, 1, format, blocksize);
-               if (ret && sense.sense_key==0x05 && sense.asc==0x20 && sense.ascq==0x00) {
-                       /*
-                        * SCSI-II devices are not required to support
-                        * READ_CD, so let's try switching block size
-                        */
-                       /* FIXME: switch back again... */
-                       if ((ret = cdrom_switch_blocksize(cdi, blocksize))) {
-                               kfree(cgc.buffer);
-                               return ret;
-                       }
-                       cgc.sense = NULL;
-                       ret = cdrom_read_cd(cdi, &cgc, lba, blocksize, 1);
-                       ret |= cdrom_switch_blocksize(cdi, blocksize);
-               }
-               if (!ret && copy_to_user((char __user *)arg, cgc.buffer, blocksize))
-                       ret = -EFAULT;
-               kfree(cgc.buffer);
+               blocksize = CD_FRAMESIZE;
+               format = 2;
+               break;
+       case CDROMREADMODE2:
+               blocksize = CD_FRAMESIZE_RAW0;
+               break;
+       }
+       IOCTL_IN(arg, struct cdrom_msf, msf);
+       lba = msf_to_lba(msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0);
+       /* FIXME: we need upper bound checking, too!! */
+       if (lba < 0)
+               return -EINVAL;
+
+       cgc->buffer = kmalloc(blocksize, GFP_KERNEL);
+       if (cgc->buffer == NULL)
+               return -ENOMEM;
+
+       memset(&sense, 0, sizeof(sense));
+       cgc->sense = &sense;
+       cgc->data_direction = CGC_DATA_READ;
+       ret = cdrom_read_block(cdi, cgc, lba, 1, format, blocksize);
+       if (ret && sense.sense_key == 0x05 &&
+                  sense.asc == 0x20 &&
+                  sense.ascq == 0x00) {
+               /*
+                * SCSI-II devices are not required to support
+                * READ_CD, so let's try switching block size
+                */
+               /* FIXME: switch back again... */
+               ret = cdrom_switch_blocksize(cdi, blocksize);
+               if (ret)
+                       goto out;
+               cgc->sense = NULL;
+               ret = cdrom_read_cd(cdi, cgc, lba, blocksize, 1);
+               ret |= cdrom_switch_blocksize(cdi, blocksize);
+       }
+       if (!ret && copy_to_user(arg, cgc->buffer, blocksize))
+               ret = -EFAULT;
+out:
+       kfree(cgc->buffer);
+       return ret;
+}
+
+static noinline int mmc_ioctl_cdrom_read_audio(struct cdrom_device_info *cdi,
+                                       void __user *arg)
+{
+       struct cdrom_read_audio ra;
+       int lba;
+
+       IOCTL_IN(arg, struct cdrom_read_audio, ra);
+
+       if (ra.addr_format == CDROM_MSF)
+               lba = msf_to_lba(ra.addr.msf.minute,
+                                ra.addr.msf.second,
+                                ra.addr.msf.frame);
+       else if (ra.addr_format == CDROM_LBA)
+               lba = ra.addr.lba;
+       else
+               return -EINVAL;
+
+       /* FIXME: we need upper bound checking, too!! */
+       if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
+               return -EINVAL;
+
+       return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
+}
+
+static noinline int mmc_ioctl_cdrom_subchannel(struct cdrom_device_info *cdi,
+                                       void __user *arg)
+{
+       int ret;
+       struct cdrom_subchnl q;
+       u_char requested, back;
+       IOCTL_IN(arg, struct cdrom_subchnl, q);
+       requested = q.cdsc_format;
+       if (!((requested == CDROM_MSF) ||
+             (requested == CDROM_LBA)))
+               return -EINVAL;
+       q.cdsc_format = CDROM_MSF;
+       ret = cdrom_read_subchannel(cdi, &q, 0);
+       if (ret)
                return ret;
-               }
-       case CDROMREADAUDIO: {
-               struct cdrom_read_audio ra;
-               int lba;
-
-               IOCTL_IN(arg, struct cdrom_read_audio, ra);
-
-               if (ra.addr_format == CDROM_MSF)
-                       lba = msf_to_lba(ra.addr.msf.minute,
-                                        ra.addr.msf.second,
-                                        ra.addr.msf.frame);
-               else if (ra.addr_format == CDROM_LBA)
-                       lba = ra.addr.lba;
-               else
-                       return -EINVAL;
+       back = q.cdsc_format; /* local copy */
+       sanitize_format(&q.cdsc_absaddr, &back, requested);
+       sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
+       IOCTL_OUT(arg, struct cdrom_subchnl, q);
+       /* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */
+       return 0;
+}
 
-               /* FIXME: we need upper bound checking, too!! */
-               if (lba < 0 || ra.nframes <= 0 || ra.nframes > CD_FRAMES)
-                       return -EINVAL;
+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;
+       struct cdrom_msf msf;
+       cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
+       IOCTL_IN(arg, struct cdrom_msf, msf);
+       cgc->cmd[0] = GPCMD_PLAY_AUDIO_MSF;
+       cgc->cmd[3] = msf.cdmsf_min0;
+       cgc->cmd[4] = msf.cdmsf_sec0;
+       cgc->cmd[5] = msf.cdmsf_frame0;
+       cgc->cmd[6] = msf.cdmsf_min1;
+       cgc->cmd[7] = msf.cdmsf_sec1;
+       cgc->cmd[8] = msf.cdmsf_frame1;
+       cgc->data_direction = CGC_DATA_NONE;
+       return cdo->generic_packet(cdi, cgc);
+}
 
-               return cdrom_read_cdda(cdi, ra.buf, lba, ra.nframes);
-               }
-       case CDROMSUBCHNL: {
-               struct cdrom_subchnl q;
-               u_char requested, back;
-               IOCTL_IN(arg, struct cdrom_subchnl, q);
-               requested = q.cdsc_format;
-               if (!((requested == CDROM_MSF) ||
-                     (requested == CDROM_LBA)))
-                       return -EINVAL;
-               q.cdsc_format = CDROM_MSF;
-               if ((ret = cdrom_read_subchannel(cdi, &q, 0)))
-                       return ret;
-               back = q.cdsc_format; /* local copy */
-               sanitize_format(&q.cdsc_absaddr, &back, requested);
-               sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
-               IOCTL_OUT(arg, struct cdrom_subchnl, q);
-               /* cdinfo(CD_DO_IOCTL, "CDROMSUBCHNL successful\n"); */ 
-               return 0;
-               }
-       case CDROMPLAYMSF: {
-               struct cdrom_msf msf;
-               cdinfo(CD_DO_IOCTL, "entering CDROMPLAYMSF\n");
-               IOCTL_IN(arg, struct cdrom_msf, msf);
-               cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
-               cgc.cmd[3] = msf.cdmsf_min0;
-               cgc.cmd[4] = msf.cdmsf_sec0;
-               cgc.cmd[5] = msf.cdmsf_frame0;
-               cgc.cmd[6] = msf.cdmsf_min1;
-               cgc.cmd[7] = msf.cdmsf_sec1;
-               cgc.cmd[8] = msf.cdmsf_frame1;
-               cgc.data_direction = CGC_DATA_NONE;
-               return cdo->generic_packet(cdi, &cgc);
-               }
-       case CDROMPLAYBLK: {
-               struct cdrom_blk blk;
-               cdinfo(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
-               IOCTL_IN(arg, struct cdrom_blk, blk);
-               cgc.cmd[0] = GPCMD_PLAY_AUDIO_10;
-               cgc.cmd[2] = (blk.from >> 24) & 0xff;
-               cgc.cmd[3] = (blk.from >> 16) & 0xff;
-               cgc.cmd[4] = (blk.from >>  8) & 0xff;
-               cgc.cmd[5] = blk.from & 0xff;
-               cgc.cmd[7] = (blk.len >> 8) & 0xff;
-               cgc.cmd[8] = blk.len & 0xff;
-               cgc.data_direction = CGC_DATA_NONE;
-               return cdo->generic_packet(cdi, &cgc);
-               }
-       case CDROMVOLCTRL:
-       case CDROMVOLREAD: {
-               struct cdrom_volctrl volctrl;
-               char mask[sizeof(buffer)];
-               unsigned short offset;
+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;
+       struct cdrom_blk blk;
+       cdinfo(CD_DO_IOCTL, "entering CDROMPLAYBLK\n");
+       IOCTL_IN(arg, struct cdrom_blk, blk);
+       cgc->cmd[0] = GPCMD_PLAY_AUDIO_10;
+       cgc->cmd[2] = (blk.from >> 24) & 0xff;
+       cgc->cmd[3] = (blk.from >> 16) & 0xff;
+       cgc->cmd[4] = (blk.from >>  8) & 0xff;
+       cgc->cmd[5] = blk.from & 0xff;
+       cgc->cmd[7] = (blk.len >> 8) & 0xff;
+       cgc->cmd[8] = blk.len & 0xff;
+       cgc->data_direction = CGC_DATA_NONE;
+       return cdo->generic_packet(cdi, cgc);
+}
 
-               cdinfo(CD_DO_IOCTL, "entering CDROMVOLUME\n");
+static noinline int mmc_ioctl_cdrom_volume(struct cdrom_device_info *cdi,
+                                       void __user *arg,
+                                       struct packet_command *cgc,
+                                       unsigned int cmd)
+{
+       struct cdrom_volctrl volctrl;
+       unsigned char buffer[32];
+       char mask[sizeof(buffer)];
+       unsigned short offset;
+       int ret;
+
+       cdinfo(CD_DO_IOCTL, "entering CDROMVOLUME\n");
 
-               IOCTL_IN(arg, struct cdrom_volctrl, volctrl);
+       IOCTL_IN(arg, struct cdrom_volctrl, volctrl);
 
-               cgc.buffer = buffer;
-               cgc.buflen = 24;
-               if ((ret = cdrom_mode_sense(cdi, &cgc, GPMODE_AUDIO_CTL_PAGE, 0)))
-                   return ret;
+       cgc->buffer = buffer;
+       cgc->buflen = 24;
+       ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 0);
+       if (ret)
+               return ret;
                
-               /* originally the code depended on buffer[1] to determine
-                  how much data is available for transfer. buffer[1] is
-                  unfortunately ambigious and the only reliable way seem
-                  to be to simply skip over the block descriptor... */
-               offset = 8 + be16_to_cpu(*(__be16 *)(buffer+6));
-
-               if (offset + 16 > sizeof(buffer))
-                       return -E2BIG;
-
-               if (offset + 16 > cgc.buflen) {
-                       cgc.buflen = offset+16;
-                       ret = cdrom_mode_sense(cdi, &cgc,
-                                               GPMODE_AUDIO_CTL_PAGE, 0);
-                       if (ret)
-                               return ret;
-               }
+       /* originally the code depended on buffer[1] to determine
+          how much data is available for transfer. buffer[1] is
+          unfortunately ambigious and the only reliable way seem
+          to be to simply skip over the block descriptor... */
+       offset = 8 + be16_to_cpu(*(__be16 *)(buffer + 6));
+
+       if (offset + 16 > sizeof(buffer))
+               return -E2BIG;
+
+       if (offset + 16 > cgc->buflen) {
+               cgc->buflen = offset + 16;
+               ret = cdrom_mode_sense(cdi, cgc,
+                                       GPMODE_AUDIO_CTL_PAGE, 0);
+               if (ret)
+                       return ret;
+       }
 
-               /* sanity check */
-               if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
-                               buffer[offset+1] < 14)
-                       return -EINVAL;
+       /* sanity check */
+       if ((buffer[offset] & 0x3f) != GPMODE_AUDIO_CTL_PAGE ||
+                       buffer[offset + 1] < 14)
+               return -EINVAL;
 
-               /* now we have the current volume settings. if it was only
-                  a CDROMVOLREAD, return these values */
-               if (cmd == CDROMVOLREAD) {
-                       volctrl.channel0 = buffer[offset+9];
-                       volctrl.channel1 = buffer[offset+11];
-                       volctrl.channel2 = buffer[offset+13];
-                       volctrl.channel3 = buffer[offset+15];
-                       IOCTL_OUT(arg, struct cdrom_volctrl, volctrl);
-                       return 0;
-               }
+       /* now we have the current volume settings. if it was only
+          a CDROMVOLREAD, return these values */
+       if (cmd == CDROMVOLREAD) {
+               volctrl.channel0 = buffer[offset+9];
+               volctrl.channel1 = buffer[offset+11];
+               volctrl.channel2 = buffer[offset+13];
+               volctrl.channel3 = buffer[offset+15];
+               IOCTL_OUT(arg, struct cdrom_volctrl, volctrl);
+               return 0;
+       }
                
-               /* get the volume mask */
-               cgc.buffer = mask;
-               if ((ret = cdrom_mode_sense(cdi, &cgc, 
-                               GPMODE_AUDIO_CTL_PAGE, 1)))
-                       return ret;
+       /* get the volume mask */
+       cgc->buffer = mask;
+       ret = cdrom_mode_sense(cdi, cgc, GPMODE_AUDIO_CTL_PAGE, 1);
+       if (ret)
+               return ret;
 
-               buffer[offset+9] = volctrl.channel0 & mask[offset+9];
-               buffer[offset+11] = volctrl.channel1 & mask[offset+11];
-               buffer[offset+13] = volctrl.channel2 & mask[offset+13];
-               buffer[offset+15] = volctrl.channel3 & mask[offset+15];
+       buffer[offset + 9]  = volctrl.channel0 & mask[offset + 9];
+       buffer[offset + 11] = volctrl.channel1 & mask[offset + 11];
+       buffer[offset + 13] = volctrl.channel2 & mask[offset + 13];
+       buffer[offset + 15] = volctrl.channel3 & mask[offset + 15];
 
-               /* set volume */
-               cgc.buffer = buffer + offset - 8;
-               memset(cgc.buffer, 0, 8);
-               return cdrom_mode_select(cdi, &cgc);
-               }
+       /* set volume */
+       cgc->buffer = buffer + offset - 8;
+       memset(cgc->buffer, 0, 8);
+       return cdrom_mode_select(cdi, cgc);
+}
 
-       case CDROMSTART:
-       case CDROMSTOP: {
-               cdinfo(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n"); 
-               cgc.cmd[0] = GPCMD_START_STOP_UNIT;
-               cgc.cmd[1] = 1;
-               cgc.cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
-               cgc.data_direction = CGC_DATA_NONE;
-               return cdo->generic_packet(cdi, &cgc);
-               }
+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;
+       cdinfo(CD_DO_IOCTL, "entering CDROMSTART/CDROMSTOP\n");
+       cgc->cmd[0] = GPCMD_START_STOP_UNIT;
+       cgc->cmd[1] = 1;
+       cgc->cmd[4] = (cmd == CDROMSTART) ? 1 : 0;
+       cgc->data_direction = CGC_DATA_NONE;
+       return cdo->generic_packet(cdi, cgc);
+}
 
-       case CDROMPAUSE:
-       case CDROMRESUME: {
-               cdinfo(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n"); 
-               cgc.cmd[0] = GPCMD_PAUSE_RESUME;
-               cgc.cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
-               cgc.data_direction = CGC_DATA_NONE;
-               return cdo->generic_packet(cdi, &cgc);
-               }
+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;
+       cdinfo(CD_DO_IOCTL, "entering CDROMPAUSE/CDROMRESUME\n");
+       cgc->cmd[0] = GPCMD_PAUSE_RESUME;
+       cgc->cmd[8] = (cmd == CDROMRESUME) ? 1 : 0;
+       cgc->data_direction = CGC_DATA_NONE;
+       return cdo->generic_packet(cdi, cgc);
+}
 
-       case DVD_READ_STRUCT: {
-               dvd_struct *s;
-               int size = sizeof(dvd_struct);
-               if (!CDROM_CAN(CDC_DVD))
-                       return -ENOSYS;
-               if ((s = kmalloc(size, GFP_KERNEL)) == NULL)
-                       return -ENOMEM;
-               cdinfo(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n"); 
-               if (copy_from_user(s, (dvd_struct __user *)arg, size)) {
-                       kfree(s);
-                       return -EFAULT;
-               }
-               if ((ret = dvd_read_struct(cdi, s))) {
-                       kfree(s);
-                       return ret;
-               }
-               if (copy_to_user((dvd_struct __user *)arg, s, size))
-                       ret = -EFAULT;
+static noinline int mmc_ioctl_dvd_read_struct(struct cdrom_device_info *cdi,
+                                               void __user *arg)
+{
+       int ret;
+       dvd_struct *s;
+       int size = sizeof(dvd_struct);
+
+       if (!CDROM_CAN(CDC_DVD))
+               return -ENOSYS;
+
+       s = kmalloc(size, GFP_KERNEL);
+       if (!s)
+               return -ENOMEM;
+
+       cdinfo(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
+       if (copy_from_user(s, arg, size)) {
                kfree(s);
+               return -EFAULT;
+       }
+
+       ret = dvd_read_struct(cdi, s);
+       if (ret)
+               goto out;
+
+       if (copy_to_user(arg, s, size))
+               ret = -EFAULT;
+out:
+       kfree(s);
+       return ret;
+}
+
+static noinline int mmc_ioctl_dvd_auth(struct cdrom_device_info *cdi,
+                                       void __user *arg)
+{
+       int ret;
+       dvd_authinfo ai;
+       if (!CDROM_CAN(CDC_DVD))
+               return -ENOSYS;
+       cdinfo(CD_DO_IOCTL, "entering DVD_AUTH\n");
+       IOCTL_IN(arg, dvd_authinfo, ai);
+       ret = dvd_do_auth(cdi, &ai);
+       if (ret)
                return ret;
-               }
+       IOCTL_OUT(arg, dvd_authinfo, ai);
+       return 0;
+}
 
-       case DVD_AUTH: {
-               dvd_authinfo ai;
-               if (!CDROM_CAN(CDC_DVD))
-                       return -ENOSYS;
-               cdinfo(CD_DO_IOCTL, "entering DVD_AUTH\n"); 
-               IOCTL_IN(arg, dvd_authinfo, ai);
-               if ((ret = dvd_do_auth (cdi, &ai)))
-                       return ret;
-               IOCTL_OUT(arg, dvd_authinfo, ai);
-               return 0;
-               }
+static noinline int mmc_ioctl_cdrom_next_writable(struct cdrom_device_info *cdi,
+                                               void __user *arg)
+{
+       int ret;
+       long next = 0;
+       cdinfo(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n");
+       ret = cdrom_get_next_writable(cdi, &next);
+       if (ret)
+               return ret;
+       IOCTL_OUT(arg, long, next);
+       return 0;
+}
 
-       case CDROM_NEXT_WRITABLE: {
-               long next = 0;
-               cdinfo(CD_DO_IOCTL, "entering CDROM_NEXT_WRITABLE\n"); 
-               if ((ret = cdrom_get_next_writable(cdi, &next)))
-                       return ret;
-               IOCTL_OUT(arg, long, next);
-               return 0;
-               }
-       case CDROM_LAST_WRITTEN: {
-               long last = 0;
-               cdinfo(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n"); 
-               if ((ret = cdrom_get_last_written(cdi, &last)))
-                       return ret;
-               IOCTL_OUT(arg, long, last);
-               return 0;
-               }
-       } /* switch */
+static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
+                                               void __user *arg)
+{
+       int ret;
+       long last = 0;
+       cdinfo(CD_DO_IOCTL, "entering CDROM_LAST_WRITTEN\n");
+       ret = cdrom_get_last_written(cdi, &last);
+       if (ret)
+               return ret;
+       IOCTL_OUT(arg, long, last);
+       return 0;
+}
+
+static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+                    unsigned long arg)
+{
+       struct packet_command cgc;
+       void __user *userptr = (void __user *)arg;
+
+       memset(&cgc, 0, sizeof(cgc));
+
+       /* build a unified command and queue it through
+          cdo->generic_packet() */
+       switch (cmd) {
+       case CDROMREADRAW:
+       case CDROMREADMODE1:
+       case CDROMREADMODE2:
+               return mmc_ioctl_cdrom_read_data(cdi, userptr, &cgc, cmd);
+       case CDROMREADAUDIO:
+               return mmc_ioctl_cdrom_read_audio(cdi, userptr);
+       case CDROMSUBCHNL:
+               return mmc_ioctl_cdrom_subchannel(cdi, userptr);
+       case CDROMPLAYMSF:
+               return mmc_ioctl_cdrom_play_msf(cdi, userptr, &cgc);
+       case CDROMPLAYBLK:
+               return mmc_ioctl_cdrom_play_blk(cdi, userptr, &cgc);
+       case CDROMVOLCTRL:
+       case CDROMVOLREAD:
+               return mmc_ioctl_cdrom_volume(cdi, userptr, &cgc, cmd);
+       case CDROMSTART:
+       case CDROMSTOP:
+               return mmc_ioctl_cdrom_start_stop(cdi, &cgc, cmd);
+       case CDROMPAUSE:
+       case CDROMRESUME:
+               return mmc_ioctl_cdrom_pause_resume(cdi, &cgc, cmd);
+       case DVD_READ_STRUCT:
+               return mmc_ioctl_dvd_read_struct(cdi, userptr);
+       case DVD_AUTH:
+               return mmc_ioctl_dvd_auth(cdi, userptr);
+       case CDROM_NEXT_WRITABLE:
+               return mmc_ioctl_cdrom_next_writable(cdi, userptr);
+       case CDROM_LAST_WRITTEN:
+               return mmc_ioctl_cdrom_last_written(cdi, userptr);
+       }
 
        return -ENOTTY;
 }