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9941fe8a04
qcom_tzmem_enable() returns -EBUSY if called a second time, but this
causes probe retries to fail permanently if a later step in
qcom_scm_probe() defers after qcom_tzmem_enable() has already succeeded.
Use DO_ONCE() to ensure qcom_tzmem_init() runs exactly once across all
calls in a thread-safe manner. qcom_tzmem_dev is set on every call since
probe retries use the same device pointer. The result of the first
initialisation is cached and returned to every subsequent caller.
Fixes: 40289e35ca ("firmware: qcom: scm: enable the TZ mem allocator")
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260724094939.613844-4-mukesh.ojha@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>