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MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch

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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@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15110/
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Redfearn 2017-01-25 17:00:25 +00:00 committed by Greg Kroah-Hartman
parent aa05503149
commit 91f9f51b18
1 changed files with 1 additions and 1 deletions
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2
arch/mips/kernel/genex.S
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@ -329,7 +329,7 @@ NESTED(except_vec_vi_handler, 0, sp)
PTR_ADD sp, t0, t1
2:
jal plat_irq_dispatch
jalr v0
/* Restore sp */
move sp, s1