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Commit e4c0058e authored by Kai Mäkisara's avatar Kai Mäkisara Committed by Linus Torvalds
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[PATCH] SCSI tape driver locking fixes 

This contains the following changes for the SCSI tape driver in 2.5.39:
- move driverfs file creation and removal outside the st_dev_arr_lock
  spinlock
- change page pointer array allocation from GFP_ATOMIC to GFP_KERNEL
parent c17acb1f
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Showing with 60 additions and 55 deletions
drivers/scsi/st.c
View file @ e4c0058e
......@@ -12,13 +12,13 @@
Copyright 1992 - 2002 Kai Makisara
email Kai.Makisara@metla.fi
Last modified: Thu Aug 22 21:57:07 2002 by makisara
Last modified: Sun Sep 29 22:29:16 2002 by makisara
Some small formal changes - aeb, 950809
Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
static char *verstr = "20020822";
static char *verstr = "20020929";
#include <linux/module.h>
......@@ -3738,51 +3738,6 @@ static int st_attach(Scsi_Device * SDp)
scsi_tapes[i] = tpnt;
dev_num = i;
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
char name[8];
static char *formats[ST_NBR_MODES] ={"", "l", "m", "a"};
/* Rewind entry */
sprintf (name, "mt%s", formats[mode]);
sprintf(tpnt->driverfs_dev_r[mode].bus_id, "%s:%s",
SDp->sdev_driverfs_dev.bus_id, name);
sprintf(tpnt->driverfs_dev_r[mode].name, "%s%s",
SDp->sdev_driverfs_dev.name, name);
tpnt->driverfs_dev_r[mode].parent = &SDp->sdev_driverfs_dev;
tpnt->driverfs_dev_r[mode].bus = &scsi_driverfs_bus_type;
tpnt->driverfs_dev_r[mode].driver_data =
(void *)(long)__mkdev(MAJOR_NR, i + (mode << 5));
device_register(&tpnt->driverfs_dev_r[mode]);
device_create_file(&tpnt->driverfs_dev_r[mode],
&dev_attr_type);
device_create_file(&tpnt->driverfs_dev_r[mode], &dev_attr_kdev);
tpnt->de_r[mode] =
devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
MAJOR_NR, i + (mode << 5),
S_IFCHR | S_IRUGO | S_IWUGO,
&st_fops, NULL);
/* No-rewind entry */
sprintf (name, "mt%sn", formats[mode]);
sprintf(tpnt->driverfs_dev_n[mode].bus_id, "%s:%s",
SDp->sdev_driverfs_dev.bus_id, name);
sprintf(tpnt->driverfs_dev_n[mode].name, "%s%s",
SDp->sdev_driverfs_dev.name, name);
tpnt->driverfs_dev_n[mode].parent= &SDp->sdev_driverfs_dev;
tpnt->driverfs_dev_n[mode].bus = &scsi_driverfs_bus_type;
tpnt->driverfs_dev_n[mode].driver_data =
(void *)(long)__mkdev(MAJOR_NR, i + (mode << 5) + 128);
device_register(&tpnt->driverfs_dev_n[mode]);
device_create_file(&tpnt->driverfs_dev_n[mode],
&dev_attr_type);
device_create_file(&tpnt->driverfs_dev_n[mode],
&dev_attr_kdev);
tpnt->de_n[mode] =
devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
MAJOR_NR, i + (mode << 5) + 128,
S_IFCHR | S_IRUGO | S_IWUGO,
&st_fops, NULL);
}
devfs_register_tape (tpnt->de_r[0]);
tpnt->device = SDp;
if (SDp->scsi_level <= 2)
tpnt->tape_type = MT_ISSCSI1;
......@@ -3863,6 +3818,53 @@ static int st_attach(Scsi_Device * SDp)
st_template.nr_dev++;
write_unlock(&st_dev_arr_lock);
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
char name[8];
static char *formats[ST_NBR_MODES] ={"", "l", "m", "a"};
/* Rewind entry */
sprintf (name, "mt%s", formats[mode]);
sprintf(tpnt->driverfs_dev_r[mode].bus_id, "%s:%s",
SDp->sdev_driverfs_dev.bus_id, name);
sprintf(tpnt->driverfs_dev_r[mode].name, "%s%s",
SDp->sdev_driverfs_dev.name, name);
tpnt->driverfs_dev_r[mode].parent = &SDp->sdev_driverfs_dev;
tpnt->driverfs_dev_r[mode].bus = &scsi_driverfs_bus_type;
tpnt->driverfs_dev_r[mode].driver_data =
(void *)(long)__mkdev(MAJOR_NR, i + (mode << 5));
device_register(&tpnt->driverfs_dev_r[mode]);
device_create_file(&tpnt->driverfs_dev_r[mode],
&dev_attr_type);
device_create_file(&tpnt->driverfs_dev_r[mode], &dev_attr_kdev);
tpnt->de_r[mode] =
devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
MAJOR_NR, i + (mode << 5),
S_IFCHR | S_IRUGO | S_IWUGO,
&st_fops, NULL);
/* No-rewind entry */
sprintf (name, "mt%sn", formats[mode]);
sprintf(tpnt->driverfs_dev_n[mode].bus_id, "%s:%s",
SDp->sdev_driverfs_dev.bus_id, name);
sprintf(tpnt->driverfs_dev_n[mode].name, "%s%s",
SDp->sdev_driverfs_dev.name, name);
tpnt->driverfs_dev_n[mode].parent= &SDp->sdev_driverfs_dev;
tpnt->driverfs_dev_n[mode].bus = &scsi_driverfs_bus_type;
tpnt->driverfs_dev_n[mode].driver_data =
(void *)(long)__mkdev(MAJOR_NR, i + (mode << 5) + 128);
device_register(&tpnt->driverfs_dev_n[mode]);
device_create_file(&tpnt->driverfs_dev_n[mode],
&dev_attr_type);
device_create_file(&tpnt->driverfs_dev_n[mode],
&dev_attr_kdev);
tpnt->de_n[mode] =
devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
MAJOR_NR, i + (mode << 5) + 128,
S_IFCHR | S_IRUGO | S_IWUGO,
&st_fops, NULL);
}
devfs_register_tape (tpnt->de_r[0]);
printk(KERN_WARNING
"Attached scsi tape st%d at scsi%d, channel %d, id %d, lun %d\n",
dev_num, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
......@@ -3893,13 +3895,21 @@ static void st_detach(Scsi_Device * SDp)
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
devfs_unregister (tpnt->de_r[mode]);
tpnt->de_r[mode] = NULL;
devfs_unregister (tpnt->de_n[mode]);
tpnt->de_n[mode] = NULL;
}
scsi_tapes[i] = 0;
SDp->attached--;
st_template.nr_dev--;
st_template.dev_noticed--;
write_unlock(&st_dev_arr_lock);
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
device_remove_file(&tpnt->driverfs_dev_r[mode],
&dev_attr_type);
device_remove_file(&tpnt->driverfs_dev_r[mode],
&dev_attr_kdev);
put_device(&tpnt->driverfs_dev_r[mode]);
devfs_unregister (tpnt->de_n[mode]);
tpnt->de_n[mode] = NULL;
device_remove_file(&tpnt->driverfs_dev_n[mode],
&dev_attr_type);
device_remove_file(&tpnt->driverfs_dev_n[mode],
......@@ -3912,11 +3922,6 @@ static void st_detach(Scsi_Device * SDp)
kfree(tpnt->buffer);
}
kfree(tpnt);
scsi_tapes[i] = 0;
SDp->attached--;
st_template.nr_dev--;
st_template.dev_noticed--;
write_unlock(&st_dev_arr_lock);
return;
}
}
......@@ -4020,7 +4025,7 @@ static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pa
if (count == 0)
return 0;
if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
return -ENOMEM;
/* Try to fault in all of the necessary pages */
......
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