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powerpc/rtas: Serialize firmware activation sequences

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Use rtas_ibm_activate_firmware_lock to prevent interleaving call
sequences of the ibm,activate-firmware RTAS function, which typically
requires multiple calls to complete the update. While the spec does
not specifically prohibit interleaved sequences, there's almost
certainly no advantage to allowing them.

Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-7-e9eafd0c8c6c@linux.ibm.com
This commit is contained in:
Nathan Lynch 2023-12-12 11:01:54 -06:00 committed by Michael Ellerman
parent adf7a019e5
commit dc7637c402
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/rtas.c
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@ -1734,10 +1734,14 @@ void rtas_activate_firmware(void)
return;
}
mutex_lock(&rtas_ibm_activate_firmware_lock);
do {
fwrc = rtas_call(token, 0, 1, NULL);
} while (rtas_busy_delay(fwrc));
mutex_unlock(&rtas_ibm_activate_firmware_lock);
if (fwrc)
pr_err("ibm,activate-firmware failed (%i)\n", fwrc);
}