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SubjectRe: Patch with scsi probing fixes

Pete,

Lets queue this one for 2.4.18pre, OK ?

On Mon, 10 Dec 2001, Pete Zaitcev wrote:

> Dear Marcelo:
>
> You said - only bugfixes for -rc1, so here's a bugfix for you.
> Attached is a conservative version of the scsi fix that I developed
> for our customers. Only the actual oops material is included,
> but no cleanups (I am working on cleanups with Andreas for 2.5.x,
> they are more radical).
>
> As a maintainer, I guess, you may take offense to scsi_dev->detected.
> It is a bloat. But personally, I see no other way to handle a failure
> of sd_init(). Traditional thinking is to call ->detach(), but it's totally
> useless before ->attach() was called. So ->detected is how I roll back
> the ->detect().
>
> -- Pete
>
> P.S. Alan tasked me with changing sd.c to allocate reasonably sized
> structures in relation to this fix, but I am not done with it yet.
> It would not be an oops fix anyways.
>
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/hosts.c linux-2.4.17-pre8-p3/drivers/scsi/hosts.c
> --- linux-2.4.17-pre8/drivers/scsi/hosts.c Thu Jul 5 11:28:17 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/hosts.c Mon Dec 10 16:07:47 2001
> @@ -275,6 +275,24 @@
> return 0;
> }
>
> +void
> +scsi_deregister_device(struct Scsi_Device_Template * tpnt)
> +{
> + struct Scsi_Device_Template *spnt;
> + struct Scsi_Device_Template *prev_spnt;
> +
> + spnt = scsi_devicelist;
> + prev_spnt = NULL;
> + while (spnt != tpnt) {
> + prev_spnt = spnt;
> + spnt = spnt->next;
> + }
> + if (prev_spnt == NULL)
> + scsi_devicelist = tpnt->next;
> + else
> + prev_spnt->next = spnt->next;
> +}
> +
> /*
> * Overrides for Emacs so that we follow Linus's tabbing style.
> * Emacs will notice this stuff at the end of the file and automatically
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/hosts.h linux-2.4.17-pre8-p3/drivers/scsi/hosts.h
> --- linux-2.4.17-pre8/drivers/scsi/hosts.h Thu Nov 22 11:49:15 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/hosts.h Mon Dec 10 16:07:47 2001
> @@ -526,6 +526,7 @@
> void scsi_initialize_queue(Scsi_Device * SDpnt, struct Scsi_Host * SHpnt);
>
> int scsi_register_device(struct Scsi_Device_Template * sdpnt);
> +void scsi_deregister_device(struct Scsi_Device_Template * tpnt);
>
> /* These are used by loadable modules */
> extern int scsi_register_module(int, void *);
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/scsi.c linux-2.4.17-pre8-p3/drivers/scsi/scsi.c
> --- linux-2.4.17-pre8/drivers/scsi/scsi.c Mon Dec 10 15:57:51 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/scsi.c Mon Dec 10 16:07:47 2001
> @@ -2261,7 +2261,7 @@
> for (SDpnt = shpnt->host_queue; SDpnt;
> SDpnt = SDpnt->next) {
> if (tpnt->detect)
> - SDpnt->attached += (*tpnt->detect) (SDpnt);
> + SDpnt->detected = (*tpnt->detect) (SDpnt);
> }
> }
>
> @@ -2269,9 +2269,19 @@
> * If any of the devices would match this driver, then perform the
> * init function.
> */
> - if (tpnt->init && tpnt->dev_noticed)
> - if ((*tpnt->init) ())
> + if (tpnt->init && tpnt->dev_noticed) {
> + if ((*tpnt->init) ()) {
> + for (shpnt = scsi_hostlist; shpnt;
> + shpnt = shpnt->next) {
> + for (SDpnt = shpnt->host_queue; SDpnt;
> + SDpnt = SDpnt->next) {
> + SDpnt->detected = 0;
> + }
> + }
> + scsi_deregister_device(tpnt);
> return 1;
> + }
> + }
>
> /*
> * Now actually connect the devices to the new driver.
> @@ -2279,6 +2289,8 @@
> for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
> for (SDpnt = shpnt->host_queue; SDpnt;
> SDpnt = SDpnt->next) {
> + SDpnt->attached += SDpnt->detected;
> + SDpnt->detected = 0;
> if (tpnt->attach)
> (*tpnt->attach) (SDpnt);
> /*
> @@ -2314,9 +2326,7 @@
> {
> Scsi_Device *SDpnt;
> struct Scsi_Host *shpnt;
> - struct Scsi_Device_Template *spnt;
> - struct Scsi_Device_Template *prev_spnt;
> -
> +
> lock_kernel();
> /*
> * If we are busy, this is not going to fly.
> @@ -2347,16 +2357,7 @@
> /*
> * Extract the template from the linked list.
> */
> - spnt = scsi_devicelist;
> - prev_spnt = NULL;
> - while (spnt != tpnt) {
> - prev_spnt = spnt;
> - spnt = spnt->next;
> - }
> - if (prev_spnt == NULL)
> - scsi_devicelist = tpnt->next;
> - else
> - prev_spnt->next = spnt->next;
> + scsi_deregister_device(tpnt);
>
> MOD_DEC_USE_COUNT;
> unlock_kernel();
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/scsi.h linux-2.4.17-pre8-p3/drivers/scsi/scsi.h
> --- linux-2.4.17-pre8/drivers/scsi/scsi.h Thu Nov 22 11:49:15 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/scsi.h Mon Dec 10 16:07:48 2001
> @@ -575,8 +575,8 @@
> * vendor-specific cmd's */
> unsigned sector_size; /* size in bytes */
>
> - int attached; /* # of high level drivers attached to
> - * this */
> + int attached; /* # of high level drivers attached to this */
> + int detected; /* Delta attached - don't use in drivers! */
> int access_count; /* Count of open channels/mounts */
>
> void *hostdata; /* available to low-level driver */
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/sd.c linux-2.4.17-pre8-p3/drivers/scsi/sd.c
> --- linux-2.4.17-pre8/drivers/scsi/sd.c Fri Nov 9 14:05:06 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/sd.c Mon Dec 10 16:07:48 2001
> @@ -1078,6 +1078,7 @@
> for (i = 0; i < N_USED_SD_MAJORS; i++) {
> if (devfs_register_blkdev(SD_MAJOR(i), "sd", &sd_fops)) {
> printk("Unable to get major %d for SCSI disk\n", SD_MAJOR(i));
> + sd_template.dev_noticed = 0;
> return 1;
> }
> }
> @@ -1175,7 +1176,8 @@
> kfree(sd_gendisks[i].de_arr);
> kfree(sd_gendisks[i].flags);
> }
> - kfree(sd_gendisks);
> + if (sd_gendisks != &sd_gendisk)
> + kfree(sd_gendisks);
> cleanup_sd_gendisks:
> kfree(sd);
> cleanup_sd:
> @@ -1188,11 +1190,13 @@
> kfree(sd_sizes);
> cleanup_disks:
> kfree(rscsi_disks);
> + rscsi_disks = NULL;
> cleanup_devfs:
> for (i = 0; i < N_USED_SD_MAJORS; i++) {
> devfs_unregister_blkdev(SD_MAJOR(i), "sd");
> }
> sd_registered--;
> + sd_template.dev_noticed = 0;
> return 1;
> }
>
> @@ -1251,7 +1255,7 @@
> if (SDp->type != TYPE_DISK && SDp->type != TYPE_MOD)
> return 0;
>
> - if (sd_template.nr_dev >= sd_template.dev_max) {
> + if (sd_template.nr_dev >= sd_template.dev_max || rscsi_disks == NULL) {
> SDp->attached--;
> return 1;
> }
> @@ -1259,8 +1263,13 @@
> if (!dpnt->device)
> break;
>
> - if (i >= sd_template.dev_max)
> - panic("scsi_devices corrupt (sd)");
> + if (i >= sd_template.dev_max) {
> + printk(KERN_WARNING "scsi_devices corrupt (sd),"
> + " nr_dev %d dev_max %d\n",
> + sd_template.nr_dev, sd_template.dev_max);
> + SDp->attached--;
> + return 1;
> + }
>
> rscsi_disks[i].device = SDp;
> rscsi_disks[i].has_part_table = 0;
> @@ -1348,6 +1357,9 @@
> int max_p;
> int start;
>
> + if (rscsi_disks == NULL)
> + return;
> +
> for (dpnt = rscsi_disks, i = 0; i < sd_template.dev_max; i++, dpnt++)
> if (dpnt->device == SDp) {
>
> @@ -1365,7 +1377,6 @@
> }
> devfs_register_partitions (&SD_GENDISK (i),
> SD_MINOR_NUMBER (start), 1);
> - /* unregister_disk() */
> dpnt->has_part_table = 0;
> dpnt->device = NULL;
> dpnt->capacity = 0;
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/sg.c linux-2.4.17-pre8-p3/drivers/scsi/sg.c
> --- linux-2.4.17-pre8/drivers/scsi/sg.c Mon Dec 10 15:57:51 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/sg.c Mon Dec 10 16:07:48 2001
> @@ -1344,6 +1344,7 @@
> printk(KERN_ERR "Unable to get major %d for generic SCSI device\n",
> SCSI_GENERIC_MAJOR);
> write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
> + sg_template.dev_noticed = 0;
> return 1;
> }
> sg_registered++;
> @@ -1356,6 +1357,7 @@
> if (NULL == sg_dev_arr) {
> printk(KERN_ERR "sg_init: no space for sg_dev_arr\n");
> write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
> + sg_template.dev_noticed = 0;
> return 1;
> }
> memset(sg_dev_arr, 0, sg_template.dev_max * sizeof(Sg_device *));
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/sr.c linux-2.4.17-pre8-p3/drivers/scsi/sr.c
> --- linux-2.4.17-pre8/drivers/scsi/sr.c Thu Oct 25 13:58:35 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/sr.c Mon Dec 10 16:07:48 2001
> @@ -789,6 +789,7 @@
> if (!sr_registered) {
> if (devfs_register_blkdev(MAJOR_NR, "sr", &sr_bdops)) {
> printk("Unable to get major %d for SCSI-CD\n", MAJOR_NR);
> + sr_template.dev_noticed = 0;
> return 1;
> }
> sr_registered++;
> @@ -830,8 +831,10 @@
> kfree(sr_sizes);
> cleanup_cds:
> kfree(scsi_CDs);
> + scsi_CDs = NULL;
> cleanup_devfs:
> devfs_unregister_blkdev(MAJOR_NR, "sr");
> + sr_template.dev_noticed = 0;
> sr_registered--;
> return 1;
> }
> @@ -905,6 +908,8 @@
> Scsi_CD *cpnt;
> int i;
>
> + if (scsi_CDs == NULL)
> + return;
> for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
> if (cpnt->device == SDp) {
> /*
> diff -ur -X dontdiff linux-2.4.17-pre8/drivers/scsi/st.c linux-2.4.17-pre8-p3/drivers/scsi/st.c
> --- linux-2.4.17-pre8/drivers/scsi/st.c Fri Nov 9 13:52:21 2001
> +++ linux-2.4.17-pre8-p3/drivers/scsi/st.c Mon Dec 10 16:07:48 2001
> @@ -3818,6 +3818,7 @@
> write_unlock_irqrestore(&st_dev_arr_lock, flags);
> printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
> MAJOR_NR);
> + st_template.dev_noticed = 0;
> return 1;
> }
> st_registered++;
>

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