pstore: Allocate compression during late_initcall()

ramoops's call of pstore_register() was recently moved to run during
late_initcall() because the crypto backend may not have been ready during
postcore_initcall(). This meant early-boot crash dumps were not getting
caught by pstore any more.

Instead, lets allow calls to pstore_register() earlier, and once crypto
is ready we can initialize the compression.

Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Fixes: cb3bee0369bc ("pstore: Use crypto compress API")
[kees: trivial rebase]
Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Guenter Roeck <groeck@chromium.org>

2 files changed, 10 insertions, 2 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index d61e26812af6..578f178a695f 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -786,13 +786,21 @@ static int __init pstore_init(void)
 
         pstore_choose_compression();
 
+        /*
+         * Check if any pstore backends registered earlier but did not
+         * initialize compression because crypto was not ready. If so,
+         * initialize compression now.
+         */
+        if (psinfo && !tfm)
+                allocate_buf_for_compression();
+
         ret = pstore_init_fs();
         if (ret)
                 return ret;
 
         return 0;
 }
-module_init(pstore_init)
+late_initcall(pstore_init);
 
 static void __exit pstore_exit(void)
 {
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index bbd1e357c23d..98e48d1a9776 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -940,7 +940,7 @@ static int __init ramoops_init(void)
         ramoops_register_dummy();
         return platform_driver_register(&ramoops_driver);
 }
-late_initcall(ramoops_init);
+postcore_initcall(ramoops_init);
 
 static void __exit ramoops_exit(void)
 {