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[S390] dasd calls kzalloc while holding a spinlock. 

The dasd function dasd_set_uid calls kzalloc while holding the
dasd_devmap_lock. Rearrange the code to do the memory allocation
outside the lock.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Horst Hummel 2006-08-10 15:45:16 +02:00 committed by Martin Schwidefsky
parent ebc4599990
commit d0710c7c9e
2 changed files with 32 additions and 41 deletions
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65
drivers/s390/block/dasd_devmap.c
View File

@ -89,7 +89,7 @@ static char *dasd[256];
module_param_array(dasd, charp, NULL, 0);
/*
* Single spinlock to protect devmap structures and lists.
* Single spinlock to protect devmap and servermap structures and lists.
*/
static DEFINE_SPINLOCK(dasd_devmap_lock);
@ -858,39 +858,6 @@ static struct attribute_group dasd_attr_group = {
.attrs = dasd_attrs,
};
/*
* Check if the related storage server is already contained in the
* dasd_serverlist. If server is not contained, create new entry.
* Return 0 if server was already in serverlist,
* 1 if the server was added successfully
* <0 in case of error.
*/
static int
dasd_add_server(struct dasd_uid *uid)
{
struct dasd_servermap *new, *tmp;
/* check if server is already contained */
list_for_each_entry(tmp, &dasd_serverlist, list)
// normale cmp?
if (strncmp(tmp->sid.vendor, uid->vendor,
sizeof(tmp->sid.vendor)) == 0
&& strncmp(tmp->sid.serial, uid->serial,
sizeof(tmp->sid.serial)) == 0)
return 0;
new = (struct dasd_servermap *)
kzalloc(sizeof(struct dasd_servermap), GFP_KERNEL);
if (!new)
return -ENOMEM;
strncpy(new->sid.vendor, uid->vendor, sizeof(new->sid.vendor));
strncpy(new->sid.serial, uid->serial, sizeof(new->sid.serial));
list_add(&new->list, &dasd_serverlist);
return 1;
}
/*
* Return copy of the device unique identifier.
*/
@ -910,6 +877,8 @@ dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
/*
* Register the given device unique identifier into devmap struct.
* In addition check if the related storage server is already contained in the
* dasd_serverlist. If server is not contained, create new entry.
* Return 0 if server was already in serverlist,
* 1 if the server was added successful
* <0 in case of error.
@ -918,16 +887,38 @@ int
dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid)
{
struct dasd_devmap *devmap;
int rc;
struct dasd_servermap *srv, *tmp;
devmap = dasd_find_busid(cdev->dev.bus_id);
if (IS_ERR(devmap))
return PTR_ERR(devmap);
/* generate entry for servermap */
srv = (struct dasd_servermap *)
kzalloc(sizeof(struct dasd_servermap), GFP_KERNEL);
if (!srv)
return -ENOMEM;
strncpy(srv->sid.vendor, uid->vendor, sizeof(srv->sid.vendor) - 1);
strncpy(srv->sid.serial, uid->serial, sizeof(srv->sid.serial) - 1);
/* server is already contained ? */
spin_lock(&dasd_devmap_lock);
devmap->uid = *uid;
rc = dasd_add_server(uid);
list_for_each_entry(tmp, &dasd_serverlist, list) {
if (!memcmp(&srv->sid, &tmp->sid,
sizeof(struct dasd_servermap))) {
kfree(srv);
srv = NULL;
break;
}
}
/* add servermap to serverlist */
if (srv)
list_add(&srv->list, &dasd_serverlist);
spin_unlock(&dasd_devmap_lock);
return rc;
return (srv ? 1 : 0);
}
EXPORT_SYMBOL_GPL(dasd_set_uid);

8
drivers/s390/block/dasd_eckd.c
View File

@ -468,11 +468,11 @@ dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
return -ENODEV;
memset(uid, 0, sizeof(struct dasd_uid));
strncpy(uid->vendor, confdata->ned1.HDA_manufacturer,
sizeof(uid->vendor) - 1);
memcpy(uid->vendor, confdata->ned1.HDA_manufacturer,
sizeof(uid->vendor) - 1);
EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
strncpy(uid->serial, confdata->ned1.HDA_location,
sizeof(uid->serial) - 1);
memcpy(uid->serial, confdata->ned1.HDA_location,
sizeof(uid->serial) - 1);
EBCASC(uid->serial, sizeof(uid->serial) - 1);
uid->ssid = confdata->neq.subsystemID;
if (confdata->ned2.sneq.flags == 0x40) {