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authorMatthew Garrett <mjg@redhat.com>2011-07-21 16:57:55 -0400
committerTony Luck <tony.luck@intel.com>2011-07-22 16:14:39 -0700
commitdee28e72b619b48ec80a9e5509db458dbe66f71f (patch)
tree781ef74fc42193f05877af53fe0787d175181bd7 /fs
parentb94fdd077eef5e6cab56836bf62695b497946716 (diff)
downloadop-kernel-dev-dee28e72b619b48ec80a9e5509db458dbe66f71f.zip
op-kernel-dev-dee28e72b619b48ec80a9e5509db458dbe66f71f.tar.gz
pstore: Allow the user to explicitly choose a backend
pstore only allows one backend to be registered at present, but the system may provide several. Add a parameter to allow the user to choose which backend will be used rather than just relying on load order. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/pstore/platform.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 49ff1de..c5300ec 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -37,6 +37,8 @@
static DEFINE_SPINLOCK(pstore_lock);
static struct pstore_info *psinfo;
+static char *backend;
+
/* How much of the console log to snapshot */
static unsigned long kmsg_bytes = 10240;
@@ -131,6 +133,12 @@ int pstore_register(struct pstore_info *psi)
spin_unlock(&pstore_lock);
return -EBUSY;
}
+
+ if (backend && strcmp(backend, psi->name)) {
+ spin_unlock(&pstore_lock);
+ return -EINVAL;
+ }
+
psinfo = psi;
spin_unlock(&pstore_lock);
@@ -208,3 +216,6 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
return 0;
}
EXPORT_SYMBOL_GPL(pstore_write);
+
+module_param(backend, charp, 0444);
+MODULE_PARM_DESC(backend, "Pstore backend to use");
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