linux-kernel - [PATCH 4.9 001/102] ARM: 8746/1: vfp: Go back to clearing vfp_current_hw

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Date:   Fri,  6 Apr 2018 15:22:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kohji Okuno <okuno.kohji@...panasonic.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH 4.9 001/102] ARM: 8746/1: vfp: Go back to clearing vfp_current_hw_state[]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabio Estevam <festevam@...il.com>

commit 1328f02005bbbaed15b9d5b7f3ab5ec9d4d5268a upstream.

Commit 384b38b66947 ("ARM: 7873/1: vfp: clear vfp_current_hw_state
for dying cpu") fixed the cpu dying notifier by clearing
vfp_current_hw_state[]. However commit e5b61bafe704 ("arm: Convert VFP
hotplug notifiers to state machine") incorrectly used the original
vfp_force_reload() function in the cpu dying notifier.

Fix it by going back to clearing vfp_current_hw_state[].

Fixes: e5b61bafe704 ("arm: Convert VFP hotplug notifiers to state machine")
Cc: linux-stable <stable@...r.kernel.org>
Reported-by: Kohji Okuno <okuno.kohji@...panasonic.com>
Signed-off-by: Fabio Estevam <fabio.estevam@....com>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/vfp/vfpmodule.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -648,7 +648,7 @@ int vfp_restore_user_hwstate(struct user
  */
 static int vfp_dying_cpu(unsigned int cpu)
 {
-	vfp_force_reload(cpu, current_thread_info());
+	vfp_current_hw_state[cpu] = NULL;
 	return 0;
 }