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Catch the divide by zero bug earlier. If the drive give back

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a zero cylinder and/or head count, set them and the sector count
to some fictious values. The same already happens if the request
sense is unsuccessfull.
This commit is contained in:
Andreas Schulz 1994-03-15 20:49:09 +00:00
parent 11e4fa43bc
commit ee3794ce7d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=1265
1 changed files with 12 additions and 3 deletions
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15
sys/scsi/sd.c
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@ -14,7 +14,7 @@
*
* Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
*
* $Id: sd.c,v 1.18 1994/01/29 11:17:10 davidg Exp $
* $Id: sd.c,v 1.19 1994/03/14 23:09:34 ats Exp $
*/
#define SPLSD splbio
@ -183,7 +183,7 @@ sdattach(sc_link)
sd_get_parms(unit, SCSI_NOSLEEP | SCSI_NOMASK);
printf("sd%d: %dMB (%d total sec), %d cyl, %d head, %d sec, bytes/sec %d\n",
unit,
dp->secsiz ? dp->disksize / ((1024L * 1024L) / dp->secsiz) : 0,
dp->disksize / ((1024L * 1024L) / dp->secsiz),
dp->disksize,
dp->cyls,
dp->heads,
@ -877,7 +877,16 @@ sd_get_parms(unit, flags)
sectors = sd_size(unit, flags);
disk_parms->disksize = sectors;
sectors /= (disk_parms->heads * disk_parms->cyls);
/* Check if none of these values are zero */
if(disk_parms->heads && disk_parms->cyls) {
sectors /= (disk_parms->heads * disk_parms->cyls);
}
else {
/* set it to something reasonable */
sectors = 32;
disk_parms->heads = 64;
disk_parms->cyls = sectors / (64 * 32);
}
disk_parms->sectors = sectors; /* dubious on SCSI *//*XXX */
}
sd->sc_link->flags |= SDEV_MEDIA_LOADED;