linux-kernel - [PATCH pstore-next v2 2/4] pstore: Allocate compression during late

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Date:   Thu, 18 Oct 2018 11:56:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH pstore-next v2 2/4] pstore: Allocate compression during late_initcall()

From: "Joel Fernandes (Google)" <joel@...lfernandes.org>

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@...eaurora.org>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Fixes: cb3bee0369bc ("pstore: Use crypto compress API")
[kees: trivial rebase]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/platform.c | 10 +++++++++-
 fs/pstore/ram.c      |  2 +-
 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 f4fd2e72add4..6ea9cd801044 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -962,7 +962,7 @@ static int __init ramoops_init(void)
 
 	return ret;
 }
-late_initcall(ramoops_init);
+postcore_initcall(ramoops_init);
 
 static void __exit ramoops_exit(void)
 {
-- 
2.17.1