Re: [PATCH] use mutex instead of semaphore in SBPCD driver

From: Eberhard Moenkeberg
Date: Tue Apr 24 2007 - 15:21:33 EST

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In reply to: Matthias Kaehlcke: "[PATCH] use mutex instead of semaphore in SBPCD driver"
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Hi,

OK for me.

Viele Grüße
Eberhard Mönkeberg (emoenke@xxxxxxx, em@xxxxxxx)

On Tue, 24 Apr 2007, Matthias Kaehlcke wrote:

> the SBPCD driver uses a semaphore as mutex. use the mutex API
> instead of the (binary) semaphore
>
> Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@xxxxxxxxx>
>
> --
>
> diff --git a/drivers/cdrom/sbpcd.c b/drivers/cdrom/sbpcd.c
> index a1283b1..5c6a8d3 100644
> --- a/drivers/cdrom/sbpcd.c
> +++ b/drivers/cdrom/sbpcd.c
> @@ -602,7 +602,7 @@ static u_char xa_tail_buf[CD_XA_TAIL];
> static volatile u_char busy_data;
> static volatile u_char busy_audio; /* true semaphores would be safer */
> #endif /* OLD_BUSY */
> -static DECLARE_MUTEX(ioctl_read_sem);
> +static DEFINE_MUTEX(ioctl_read_mtx);
> static u_long timeout;
> static volatile u_char timed_out_delay;
> static volatile u_char timed_out_data;
> @@ -834,7 +834,7 @@ static void sbp_sleep(u_int time)
> sti();
> }
> /*==========================================================================*/
> -#define RETURN_UP(rc) {up(&ioctl_read_sem); return(rc);}
> +#define RETURN_UNLOCK(rc) {mutex_unlock(&ioctl_read_mtx); return(rc);}
> /*==========================================================================*/
> /*
> * convert logical_block_address to m-s-f_number (3 bytes only)
> @@ -4174,7 +4174,7 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> msg(DBG_INF, "ioctl: bad device: %s\n", cdi->name);
> return (-ENXIO); /* no such drive */
> }
> - down(&ioctl_read_sem);
> + mutex_lock(&ioctl_read_mtx);
> if (p != current_drive)
> switch_drive(p);
>
> @@ -4193,19 +4193,19 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> case audio_playing:
> if (famL_drive) i=cc_ReadSubQ();
> else i=cc_Pause_Resume(1);
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> if (famL_drive) i=cc_Pause_Resume(1);
> else i=cc_ReadSubQ();
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> current_drive->pos_audio_start=current_drive->SubQ_run_tot;
> current_drive->audio_state=audio_pausing;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
> case audio_pausing:
> i=cc_Seek(current_drive->pos_audio_start,1);
> - if (i<0) RETURN_UP(-EIO);
> - RETURN_UP(0);
> + if (i<0) RETURN_UNLOCK(-EIO);
> + RETURN_UNLOCK(0);
> default:
> - RETURN_UP(-EINVAL);
> + RETURN_UNLOCK(-EINVAL);
> }
>
> case CDROMRESUME: /* resume paused audio play */
> @@ -4213,26 +4213,26 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> /* resume playing audio tracks when a previous PLAY AUDIO call has */
> /* been paused with a PAUSE command. */
> /* It will resume playing from the location saved in SubQ_run_tot. */
> - if (current_drive->audio_state!=audio_pausing) RETURN_UP(-EINVAL);
> + if (current_drive->audio_state!=audio_pausing) RETURN_UNLOCK(-EINVAL);
> if (famL_drive)
> i=cc_PlayAudio(current_drive->pos_audio_start,
> current_drive->pos_audio_end);
> else i=cc_Pause_Resume(3);
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> current_drive->audio_state=audio_playing;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMPLAYMSF:
> msg(DBG_IOC,"ioctl: CDROMPLAYMSF entered.\n");
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> if (current_drive->audio_state==audio_playing)
> {
> i=cc_Pause_Resume(1);
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> i=cc_ReadSubQ();
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> current_drive->pos_audio_start=current_drive->SubQ_run_tot;
> i=cc_Seek(current_drive->pos_audio_start,1);
> }
> @@ -4252,30 +4252,30 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> msg(DBG_INF,"ioctl: cc_PlayAudio returns %d\n",i);
> DriveReset();
> current_drive->audio_state=0;
> - RETURN_UP(-EIO);
> + RETURN_UNLOCK(-EIO);
> }
> current_drive->audio_state=audio_playing;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMPLAYTRKIND: /* Play a track. This currently ignores index. */
> msg(DBG_IOC,"ioctl: CDROMPLAYTRKIND entered.\n");
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> if (current_drive->audio_state==audio_playing)
> {
> msg(DBG_IOX,"CDROMPLAYTRKIND: already audio_playing.\n");
> #if 1
> - RETURN_UP(0); /* just let us play on */
> + RETURN_UNLOCK(0); /* just let us play on */
> #else
> - RETURN_UP(-EINVAL); /* play on, but say "error" */
> + RETURN_UNLOCK(-EINVAL); /* play on, but say "error" */
> #endif
> }
> memcpy(&ti,(void *) arg,sizeof(struct cdrom_ti));
> msg(DBG_IOX,"ioctl: trk0: %d, ind0: %d, trk1:%d, ind1:%d\n",
> ti.cdti_trk0,ti.cdti_ind0,ti.cdti_trk1,ti.cdti_ind1);
> - if (ti.cdti_trk0<current_drive->n_first_track) RETURN_UP(-EINVAL);
> - if (ti.cdti_trk0>current_drive->n_last_track) RETURN_UP(-EINVAL);
> + if (ti.cdti_trk0<current_drive->n_first_track) RETURN_UNLOCK(-EINVAL);
> + if (ti.cdti_trk0>current_drive->n_last_track) RETURN_UNLOCK(-EINVAL);
> if (ti.cdti_trk1<ti.cdti_trk0) ti.cdti_trk1=ti.cdti_trk0;
> if (ti.cdti_trk1>current_drive->n_last_track) ti.cdti_trk1=current_drive->n_last_track;
> current_drive->pos_audio_start=current_drive->TocBuffer[ti.cdti_trk0].address;
> @@ -4286,17 +4286,17 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> msg(DBG_INF,"ioctl: cc_PlayAudio returns %d\n",i);
> DriveReset();
> current_drive->audio_state=0;
> - RETURN_UP(-EIO);
> + RETURN_UNLOCK(-EIO);
> }
> current_drive->audio_state=audio_playing;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMREADTOCHDR: /* Read the table of contents header */
> msg(DBG_IOC,"ioctl: CDROMREADTOCHDR entered.\n");
> tochdr.cdth_trk0=current_drive->n_first_track;
> tochdr.cdth_trk1=current_drive->n_last_track;
> memcpy((void *) arg, &tochdr, sizeof(struct cdrom_tochdr));
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMREADTOCENTRY: /* Read an entry in the table of contents */
> msg(DBG_IOC,"ioctl: CDROMREADTOCENTRY entered.\n");
> @@ -4304,7 +4304,7 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> i=tocentry.cdte_track;
> if (i==CDROM_LEADOUT) i=current_drive->n_last_track+1;
> else if (i<current_drive->n_first_track||i>current_drive->n_last_track)
> - RETURN_UP(-EINVAL);
> + RETURN_UNLOCK(-EINVAL);
> tocentry.cdte_adr=current_drive->TocBuffer[i].ctl_adr&0x0F;
> tocentry.cdte_ctrl=(current_drive->TocBuffer[i].ctl_adr>>4)&0x0F;
> tocentry.cdte_datamode=current_drive->TocBuffer[i].format;
> @@ -4316,27 +4316,27 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> }
> else if (tocentry.cdte_format==CDROM_LBA) /* blk required */
> tocentry.cdte_addr.lba=msf2blk(current_drive->TocBuffer[i].address);
> - else RETURN_UP(-EINVAL);
> + else RETURN_UNLOCK(-EINVAL);
> memcpy((void *) arg, &tocentry, sizeof(struct cdrom_tocentry));
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMSTOP: /* Spin down the drive */
> msg(DBG_IOC,"ioctl: CDROMSTOP entered.\n");
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> i=cc_Pause_Resume(1);
> current_drive->audio_state=0;
> #if 0
> cc_DriveReset();
> #endif
> - RETURN_UP(i);
> + RETURN_UNLOCK(i);
>
> case CDROMSTART: /* Spin up the drive */
> msg(DBG_IOC,"ioctl: CDROMSTART entered.\n");
> cc_SpinUp();
> current_drive->audio_state=0;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMVOLCTRL: /* Volume control */
> msg(DBG_IOC,"ioctl: CDROMVOLCTRL entered.\n");
> @@ -4346,25 +4346,25 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> current_drive->vol_chan1=1;
> current_drive->vol_ctrl1=volctrl.channel1;
> i=cc_SetVolume();
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMVOLREAD: /* read Volume settings from drive */
> msg(DBG_IOC,"ioctl: CDROMVOLREAD entered.\n");
> st=cc_GetVolume();
> - if (st<0) RETURN_UP(st);
> + if (st<0) RETURN_UNLOCK(st);
> volctrl.channel0=current_drive->vol_ctrl0;
> volctrl.channel1=current_drive->vol_ctrl1;
> volctrl.channel2=0;
> volctrl.channel2=0;
> memcpy((void *)arg,&volctrl,sizeof(volctrl));
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMSUBCHNL: /* Get subchannel info */
> msg(DBG_IOS,"ioctl: CDROMSUBCHNL entered.\n");
> /* Bogus, I can do better than this! --AJK
> if ((st_spinning)||(!subq_valid)) {
> i=cc_ReadSubQ();
> - if (i<0) RETURN_UP(-EIO);
> + if (i<0) RETURN_UNLOCK(-EIO);
> }
> */
> i=cc_ReadSubQ();
> @@ -4378,7 +4378,7 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> msg(DBG_000,"Disk changed detect\n");
> current_drive->diskstate_flags &= ~cd_size_bit;
> }
> - RETURN_UP(-EIO);
> + RETURN_UNLOCK(-EIO);
> }
> if (current_drive->CD_changed==0xFF) {
> /* reread the TOC because the disk has changed! --AJK */
> @@ -4386,9 +4386,9 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> i=DiskInfo();
> if(i==0) {
> current_drive->CD_changed=0x00; /* cd has changed, procede, */
> - RETURN_UP(-EIO); /* and get TOC, etc on next try! --AJK */
> + RETURN_UNLOCK(-EIO); /* and get TOC, etc on next try! --AJK */
> } else {
> - RETURN_UP(-EIO); /* we weren't ready yet! --AJK */
> + RETURN_UNLOCK(-EIO); /* we weren't ready yet! --AJK */
> }
> }
> memcpy(&SC, (void *) arg, sizeof(struct cdrom_subchnl));
> @@ -4451,11 +4451,11 @@ static int sbpcd_audio_ioctl(struct cdrom_device_info *cdi, u_int cmd,
> SC.cdsc_adr,SC.cdsc_ctrl,
> SC.cdsc_trk,SC.cdsc_ind,
> SC.cdsc_absaddr,SC.cdsc_reladdr);
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> default:
> msg(DBG_IOC,"ioctl: unknown function request %04X\n", cmd);
> - RETURN_UP(-EINVAL);
> + RETURN_UNLOCK(-EINVAL);
> } /* end switch(cmd) */
> }
> /*==========================================================================*/
> @@ -4549,7 +4549,7 @@ static void do_sbpcd_request(request_queue_t * q)
> end_request(req, 0);
> spin_unlock_irq(q->queue_lock);
>
> - down(&ioctl_read_sem);
> + mutex_lock(&ioctl_read_mtx);
> if (rq_data_dir(elv_next_request(q)) != READ)
> {
> msg(DBG_INF, "bad cmd %d\n", req->cmd[0]);
> @@ -4581,7 +4581,7 @@ static void do_sbpcd_request(request_queue_t * q)
> printk(" do_sbpcd_request[%do](%p:%ld+%ld) end 2, Time:%li\n",
> xnr, req, req->sector, req->nr_sectors, jiffies);
> #endif
> - up(&ioctl_read_sem);
> + mutex_unlock(&ioctl_read_mtx);
> spin_lock_irq(q->queue_lock);
> end_request(req, 1);
> goto request_loop;
> @@ -4622,7 +4622,7 @@ static void do_sbpcd_request(request_queue_t * q)
> printk(" do_sbpcd_request[%do](%p:%ld+%ld) end 3, Time:%li\n",
> xnr, req, req->sector, req->nr_sectors, jiffies);
> #endif
> - up(&ioctl_read_sem);
> + mutex_unlock(&ioctl_read_mtx);
> spin_lock_irq(q->queue_lock);
> end_request(req, 1);
> goto request_loop;
> @@ -4637,7 +4637,7 @@ static void do_sbpcd_request(request_queue_t * q)
> printk(" do_sbpcd_request[%do](%p:%ld+%ld) end 4 (error), Time:%li\n",
> xnr, req, req->sector, req->nr_sectors, jiffies);
> #endif
> - up(&ioctl_read_sem);
> + mutex_unlock(&ioctl_read_mtx);
> sbp_sleep(0); /* wait a bit, try again */
> spin_lock_irq(q->queue_lock);
> end_request(req, 0);
> @@ -5059,7 +5059,7 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> msg(DBG_INF, "ioctl: bad device: %s\n", cdi->name);
> return (-ENXIO); /* no such drive */
> }
> - down(&ioctl_read_sem);
> + mutex_lock(&ioctl_read_mtx);
> if (p != current_drive)
> switch_drive(p);
>
> @@ -5067,34 +5067,34 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> switch (cmd) /* Sun-compatible */
> {
> case DDIOCSDBG: /* DDI Debug */
> - if (!capable(CAP_SYS_ADMIN)) RETURN_UP(-EPERM);
> + if (!capable(CAP_SYS_ADMIN)) RETURN_UNLOCK(-EPERM);
> i=sbpcd_dbg_ioctl(arg,1);
> - RETURN_UP(i);
> + RETURN_UNLOCK(i);
> case CDROMRESET: /* hard reset the drive */
> msg(DBG_IOC,"ioctl: CDROMRESET entered.\n");
> i=DriveReset();
> current_drive->audio_state=0;
> - RETURN_UP(i);
> + RETURN_UNLOCK(i);
>
> case CDROMREADMODE1:
> msg(DBG_IOC,"ioctl: CDROMREADMODE1 requested.\n");
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> cc_ModeSelect(CD_FRAMESIZE);
> cc_ModeSense();
> current_drive->mode=READ_M1;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMREADMODE2: /* not usable at the moment */
> msg(DBG_IOC,"ioctl: CDROMREADMODE2 requested.\n");
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> cc_ModeSelect(CD_FRAMESIZE_RAW1);
> cc_ModeSense();
> current_drive->mode=READ_M2;
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
>
> case CDROMAUDIOBUFSIZ: /* configure the audio buffer size */
> msg(DBG_IOC,"ioctl: CDROMAUDIOBUFSIZ entered.\n");
> @@ -5106,7 +5106,7 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> if (current_drive->sbp_audsiz>16)
> {
> current_drive->sbp_audsiz = 0;
> - RETURN_UP(current_drive->sbp_audsiz);
> + RETURN_UNLOCK(current_drive->sbp_audsiz);
> }
>
> if (current_drive->sbp_audsiz>0)
> @@ -5119,7 +5119,7 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> }
> else msg(DBG_INF,"audio buffer size: %d frames.\n",current_drive->sbp_audsiz);
> }
> - RETURN_UP(current_drive->sbp_audsiz);
> + RETURN_UNLOCK(current_drive->sbp_audsiz);
>
> case CDROMREADAUDIO:
> { /* start of CDROMREADAUDIO */
> @@ -5134,27 +5134,27 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> int error_flag;
>
> msg(DBG_IOC,"ioctl: CDROMREADAUDIO entered.\n");
> - if (fam0_drive) RETURN_UP(-EINVAL);
> - if (famL_drive) RETURN_UP(-EINVAL);
> - if (famV_drive) RETURN_UP(-EINVAL);
> - if (famT_drive) RETURN_UP(-EINVAL);
> + if (fam0_drive) RETURN_UNLOCK(-EINVAL);
> + if (famL_drive) RETURN_UNLOCK(-EINVAL);
> + if (famV_drive) RETURN_UNLOCK(-EINVAL);
> + if (famT_drive) RETURN_UNLOCK(-EINVAL);
> #ifdef SAFE_MIXED
> - if (current_drive->has_data>1) RETURN_UP(-EBUSY);
> + if (current_drive->has_data>1) RETURN_UNLOCK(-EBUSY);
> #endif /* SAFE_MIXED */
> - if (current_drive->aud_buf==NULL) RETURN_UP(-EINVAL);
> + if (current_drive->aud_buf==NULL) RETURN_UNLOCK(-EINVAL);
> if (copy_from_user(&read_audio, (void __user *)arg,
> sizeof(struct cdrom_read_audio)))
> - RETURN_UP(-EFAULT);
> - if (read_audio.nframes < 0 || read_audio.nframes>current_drive->sbp_audsiz) RETURN_UP(-EINVAL);
> + RETURN_UNLOCK(-EFAULT);
> + if (read_audio.nframes < 0 || read_audio.nframes>current_drive->sbp_audsiz) RETURN_UNLOCK(-EINVAL);
> if (!access_ok(VERIFY_WRITE, read_audio.buf,
> read_audio.nframes*CD_FRAMESIZE_RAW))
> - RETURN_UP(-EFAULT);
> + RETURN_UNLOCK(-EFAULT);
>
> if (read_audio.addr_format==CDROM_MSF) /* MSF-bin specification of where to start */
> block=msf2lba(&read_audio.addr.msf.minute);
> else if (read_audio.addr_format==CDROM_LBA) /* lba specification of where to start */
> block=read_audio.addr.lba;
> - else RETURN_UP(-EINVAL);
> + else RETURN_UNLOCK(-EINVAL);
> #if 000
> i=cc_SetSpeed(speed_150,0,0);
> if (i) msg(DBG_AUD,"read_audio: SetSpeed error %d\n", i);
> @@ -5344,7 +5344,7 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> if (copy_to_user(read_audio.buf,
> current_drive->aud_buf,
> read_audio.nframes * CD_FRAMESIZE_RAW))
> - RETURN_UP(-EFAULT);
> + RETURN_UNLOCK(-EFAULT);
> msg(DBG_AUD,"read_audio: copy_to_user done.\n");
> break;
> }
> @@ -5357,15 +5357,15 @@ static int sbpcd_block_ioctl(struct inode *inode, struct file *file,
> if (data_tries == 0)
> {
> msg(DBG_AUD,"read_audio: failed after 5 tries in line %d.\n", __LINE__);
> - RETURN_UP(-EIO);
> + RETURN_UNLOCK(-EIO);
> }
> msg(DBG_AUD,"read_audio: successful return.\n");
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
> } /* end of CDROMREADAUDIO */
>
> default:
> msg(DBG_IOC,"ioctl: unknown function request %04X\n", cmd);
> - RETURN_UP(-EINVAL);
> + RETURN_UNLOCK(-EINVAL);
> } /* end switch(cmd) */
> }
>
> @@ -5391,7 +5391,7 @@ static int sbpcd_open(struct cdrom_device_info *cdi, int purpose)
> {
> struct sbpcd_drive *p = cdi->handle;
>
> - down(&ioctl_read_sem);
> + mutex_lock(&ioctl_read_mtx);
> switch_drive(p);
>
> /*
> @@ -5419,7 +5419,7 @@ static int sbpcd_open(struct cdrom_device_info *cdi, int purpose)
> #endif /* SAFE_MIXED */
> }
> if (!st_spinning) cc_SpinUp();
> - RETURN_UP(0);
> + RETURN_UNLOCK(0);
> }
> /*==========================================================================*/
> /*
> @@ -5433,7 +5433,7 @@ static void sbpcd_release(struct cdrom_device_info * cdi)
> msg(DBG_INF, "release: bad device: %s\n", cdi->name);
> return;
> }
> - down(&ioctl_read_sem);
> + mutex_lock(&ioctl_read_mtx);
> switch_drive(p);
> /*
> * try to keep an "open" counter here and unlock the door if 1->0.
> @@ -5454,7 +5454,7 @@ static void sbpcd_release(struct cdrom_device_info * cdi)
> #endif /* SAFE_MIXED */
> }
> }
> - up(&ioctl_read_sem);
> + mutex_unlock(&ioctl_read_mtx);
> return ;
> }
> /*==========================================================================*/
>
> --
> Matthias Kaehlcke
> Linux Application Developer
> Barcelona
>
> The assumption that what currently exists must necessarily
> exist is the acid that corrodes all visionary thinking
> .''`.
> using free software / Debian GNU/Linux | http://debian.org : :' :
> `. `'`
> gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4 `-
>

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