From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 28 Feb 2020 11:42:57 +0000 (+0100)
Subject: 4.19-stable patches
X-Git-Tag: v4.4.215~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0f95a4ca841685ece0e307af55b25c800bc23bb2;p=thirdparty%2Fkernel%2Fstable-queue.git

4.19-stable patches

added patches:
	revert-char-random-silence-a-lockdep-splat-with-printk.patch
---

diff --git a/queue-4.19/revert-char-random-silence-a-lockdep-splat-with-printk.patch b/queue-4.19/revert-char-random-silence-a-lockdep-splat-with-printk.patch
new file mode 100644
index 00000000000..eae430ac8ac
--- /dev/null
+++ b/queue-4.19/revert-char-random-silence-a-lockdep-splat-with-printk.patch
@@ -0,0 +1,53 @@
+From d35ac6648c712f0d79adc6522f3f71e8b871e349 Mon Sep 17 00:00:00 2001
+From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Date: Fri, 28 Feb 2020 12:40:03 +0100
+Subject: [PATCH] Revert "char/random: silence a lockdep splat with printk()"
+
+This reverts commit 15341b1dd409749fa5625e4b632013b6ba81609b which is
+commit 1b710b1b10eff9d46666064ea25f079f70bc67a8 upstream.
+
+Lech writes:
+	After upgrading kernel on our boards from v4.19.105 to v4.19.106
+	we found out that syslog fails to read the messages after ones
+	read initially after opening /proc/kmsg just after booting.
+
+	I also found out, that output of 'dmesg --follow' also doesn't
+	react on new printks appearing for whatever reason - to read new
+	messages, reopening /proc/kmsg or /dev/kmsg was needed.
+
+	I bisected this down to commit
+	15341b1dd409749fa5625e4b632013b6ba81609b ("char/random: silence
+	a lockdep splat with printk()"), and reverting it on top of
+	v4.19.106 restored correct behaviour.
+
+While people dig to find out how such an odd change causes a lockup,
+let's just revert this for now as it's not all that big of a deal for
+4.19.y.
+
+Reported-by: Lech Perczak <l.perczak@camlintechnologies.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
+Cc: Qian Cai <cai@lca.pw>
+Cc: Theodore Ts'o <tytso@mit.edu>
+Cc: Sasha Levin <sashal@kernel.org>
+Cc: Petr Mladek <pmladek@suse.com>
+Cc: John Ogness <john.ogness@linutronix.de>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/char/random.c |    5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+--- a/drivers/char/random.c
++++ b/drivers/char/random.c
+@@ -1609,9 +1609,8 @@ static void _warn_unseeded_randomness(co
+ 	print_once = true;
+ #endif
+ 	if (__ratelimit(&unseeded_warning))
+-		printk_deferred(KERN_NOTICE "random: %s called from %pS "
+-				"with crng_init=%d\n", func_name, caller,
+-				crng_init);
++		pr_notice("random: %s called from %pS with crng_init=%d\n",
++			  func_name, caller, crng_init);
+ }
+ 
+ /*
diff --git a/queue-4.19/series b/queue-4.19/series
index 27af8f278ac..5879c0d1745 100644
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -95,3 +95,4 @@ rxrpc-fix-call-rcu-cleanup-using-non-bh-safe-locks.patch
 ata-ahci-add-shutdown-to-freeze-hardware-resources-of-ahci.patch
 xen-enable-interrupts-when-calling-_cond_resched.patch
 s390-mm-explicitly-compare-page_default_key-against-zero-in-storage_key_init_range.patch
+revert-char-random-silence-a-lockdep-splat-with-printk.patch