soc: qcom: smd-rpm: Use GFP_ATOMIC in write path

Preparing for better lockdep annotations for things that happen in runpm
suspend/resume path vs shrinker/reclaim in the following patches, we
need to avoid allocations that can trigger reclaim in the icc_set_bw()
path.  In the RPMh case, rpmh_write_batch() already uses GFP_ATOMIC, so
it should be reasonable to use in the smd-rpm case as well.

Alternatively, 256bytes is small enough for a function that isn't called
recursively to allocate on-stack.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230320144356.803762-21-robdclark@gmail.com

drivers/soc/qcom/smd-rpm.c

@@ -113,7 +113,7 @@ int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
 	if (WARN_ON(size >= 256))
 		return -EINVAL;
 
-	pkt = kmalloc(size, GFP_KERNEL);
+	pkt = kmalloc(size, GFP_ATOMIC);
 	if (!pkt)
 		return -ENOMEM;