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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-03-08 16:50:46 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-05-19 16:11:27 +0300 |
| commit | 804c0a166ffea628eb7ef72b9fd710883cb1fa8f (patch) | |
| tree | ce80ffed707d98661c28b31b4be35a6226d2cf84 /arch/powerpc/kernel/rtas.c | |
| parent | 014b2e896cc8445fcc04636e69bf5f9e24281daa (diff) | |
| download | linux-804c0a166ffea628eb7ef72b9fd710883cb1fa8f.tar.xz | |
powerpc/rtas: enture rtas_call is called with MMU enabled
rtas_call must not be called with the MMU disabled because in case
of rtas error, log_error is called which requires MMU enabled. Add
a test and warning for this.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-14-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/rtas.c')
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index c1403dc4fd66..9bb43aa53d43 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -476,6 +476,11 @@ int rtas_call(int token, int nargs, int nret, int *outputs, ...) if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) return -1; + if ((mfmsr() & (MSR_IR|MSR_DR)) != (MSR_IR|MSR_DR)) { + WARN_ON_ONCE(1); + return -1; + } + s = lock_rtas(); /* We use the global rtas args buffer */ |