This is a note to let you know that I've just added the patch titled
MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-irq-stack-fix-erroneous-jal-to-plat_irq_dispatch.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c25f8064c1d5731a2ce5664def890140dcdd3e5c Mon Sep 17 00:00:00 2001
From: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
Date: Wed, 25 Jan 2017 17:00:25 +0000
Subject: MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
From: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
commit c25f8064c1d5731a2ce5664def890140dcdd3e5c upstream.
Commit dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
changed both the normal and vectored interrupt handlers. Unfortunately
the vectored version, "except_vec_vi_handler", was incorrectly modified
to unconditionally jal to plat_irq_dispatch, rather than doing a jalr to
the vectored handler that has been set up. This is ok for many platforms
which set the vectored handler to plat_irq_dispatch anyway, but will
cause problems with platforms that use other handlers.
Fixes: dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/15110/
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/genex.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -330,7 +330,7 @@ NESTED(except_vec_vi_handler, 0, sp)
PTR_ADD sp, t0, t1
2:
- jal plat_irq_dispatch
+ jalr v0
/* Restore sp */
move sp, s1
Patches currently in stable-queue which might be from matt.redfearn@xxxxxxxxxx are
queue-4.4/mips-switch-to-the-irq_stack-in-interrupts.patch
queue-4.4/mips-select-have_irq_exit_on_irq_stack.patch
queue-4.4/mips-only-change-28-to-thread_info-if-coming-from-user-mode.patch
queue-4.4/mips-stack-unwinding-while-on-irq-stack.patch
queue-4.4/mips-irq-stack-fix-erroneous-jal-to-plat_irq_dispatch.patch
queue-4.4/mips-introduce-irq_stack.patch