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authorHorst Hummel <horst.hummel@de.ibm.com>2006-08-10 15:45:16 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-08-10 15:45:16 +0200
commitd0710c7c9eea2145a0614f39dbe9dc8cb4ae14da (patch)
tree6d89207033a0a4a9e0c02b507a7f4745d40d4a9d /drivers/s390/block/dasd_devmap.c
parentebc4599990898ecaaace7ed40dfad6d8d9f2a24a (diff)
[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>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
-rw-r--r--drivers/s390/block/dasd_devmap.c65
1 files changed, 28 insertions, 37 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 7f6fdac7470..6fcb28d55a9 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -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);
@@ -859,39 +859,6 @@ static struct attribute_group dasd_attr_group = {
};
/*
- * 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.
*/
int
@@ -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);