target/linux/generic/patches-4.4/062-06-MIPS-IRQ-Stack-Fix-erroneous-jal-to-plat_irq_dispatc.patch

   1 From de856416e7143e32afc4849625616554aa060f7a Mon Sep 17 00:00:00 2001
   2 From: Matt Redfearn <matt.redfearn@imgtec.com>
   3 Date: Wed, 25 Jan 2017 17:00:25 +0000
   4 Subject: [PATCH] MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
   5
   6 Commit dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
   7 changed both the normal and vectored interrupt handlers. Unfortunately
   8 the vectored version, "except_vec_vi_handler", was incorrectly modified
   9 to unconditionally jal to plat_irq_dispatch, rather than doing a jalr to
  10 the vectored handler that has been set up. This is ok for many platforms
  11 which set the vectored handler to plat_irq_dispatch anyway, but will
  12 cause problems with platforms that use other handlers.
  13
  14 Fixes: dda45f701c9d ("MIPS: Switch to the irq_stack in interrupts")
  15 Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
  16 Cc: Ralf Baechle <ralf@linux-mips.org>
  17 Cc: Paul Burton <paul.burton@imgtec.com>
  18 Cc: linux-mips@linux-mips.org
  19 Patchwork: https://patchwork.linux-mips.org/patch/15110/
  20 Signed-off-by: James Hogan <james.hogan@imgtec.com>
  21 ---
  22  arch/mips/kernel/genex.S | 2 +-
  23  1 file changed, 1 insertion(+), 1 deletion(-)
  24
  25 --- a/arch/mips/kernel/genex.S
  26 +++ b/arch/mips/kernel/genex.S
  27 @@ -330,7 +330,7 @@ NESTED(except_vec_vi_handler, 0, sp)
  28         PTR_ADD sp, t0, t1
  29
  30  2:
  31 -       jal     plat_irq_dispatch
  32 +       jalr    v0
  33
  34         /* Restore sp */
  35         move    sp, s1