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Diffstat (limited to 'fs/pstore/platform.c')
-rw-r--r--fs/pstore/platform.c47
1 files changed, 44 insertions, 3 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 791743deedf1..588461bb2dd4 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -237,6 +237,14 @@ static void allocate_buf_for_compression(void)
}
+static void free_buf_for_compression(void)
+{
+ kfree(stream.workspace);
+ stream.workspace = NULL;
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+}
+
/*
* Called when compression fails, since the printk buffer
* would be fetched for compression calling it again when
@@ -353,6 +361,19 @@ static struct kmsg_dumper pstore_dumper = {
.dump = pstore_dump,
};
+/*
+ * Register with kmsg_dump to save last part of console log on panic.
+ */
+static void pstore_register_kmsg(void)
+{
+ kmsg_dump_register(&pstore_dumper);
+}
+
+static void pstore_unregister_kmsg(void)
+{
+ kmsg_dump_unregister(&pstore_dumper);
+}
+
#ifdef CONFIG_PSTORE_CONSOLE
static void pstore_console_write(struct console *con, const char *s, unsigned c)
{
@@ -390,8 +411,14 @@ static void pstore_register_console(void)
{
register_console(&pstore_console);
}
+
+static void pstore_unregister_console(void)
+{
+ unregister_console(&pstore_console);
+}
#else
static void pstore_register_console(void) {}
+static void pstore_unregister_console(void) {}
#endif
static int pstore_write_compat(enum pstore_type_id type,
@@ -410,8 +437,6 @@ static int pstore_write_compat(enum pstore_type_id type,
* read function right away to populate the file system. If not
* then the pstore mount code will call us later to fill out
* the file system.
- *
- * Register with kmsg_dump to save last part of console log on panic.
*/
int pstore_register(struct pstore_info *psi)
{
@@ -442,7 +467,7 @@ int pstore_register(struct pstore_info *psi)
if (pstore_is_mounted())
pstore_get_records(0);
- kmsg_dump_register(&pstore_dumper);
+ pstore_register_kmsg();
if ((psi->flags & PSTORE_FLAGS_FRAGILE) == 0) {
pstore_register_console();
@@ -462,12 +487,28 @@ int pstore_register(struct pstore_info *psi)
*/
backend = psi->name;
+ module_put(owner);
+
pr_info("Registered %s as persistent store backend\n", psi->name);
return 0;
}
EXPORT_SYMBOL_GPL(pstore_register);
+void pstore_unregister(struct pstore_info *psi)
+{
+ pstore_unregister_pmsg();
+ pstore_unregister_ftrace();
+ pstore_unregister_console();
+ pstore_unregister_kmsg();
+
+ free_buf_for_compression();
+
+ psinfo = NULL;
+ backend = NULL;
+}
+EXPORT_SYMBOL_GPL(pstore_unregister);
+
/*
* Read all the records from the persistent store. Create
* files in our filesystem. Don't warn about -EEXIST errors