FAILED: patch "[PATCH] crypto: hisi-trng - Remove crypto_rng interface" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 216a7795ec210bdabd5dad42323eee70bbfc8d90
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026071531-squash-prototype-9f5d@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 216a7795ec210bdabd5dad42323eee70bbfc8d90 Mon Sep 17 00:00:00 2001
From: Eric Biggers <[email protected]>
Date: Sat, 30 May 2026 13:26:23 -0700
Subject: [PATCH] crypto: hisi-trng - Remove crypto_rng interface

drivers/crypto/hisilicon/trng/trng.c exposes the same hardware through two completely separate interfaces, crypto_rng and hwrng. However, the implementation of this is buggy because it permits generation operations from these interfaces to run concurrently with each other, accessing the same registers. That is, hisi_trng_generate() synchronizes with itself but not with hisi_trng_read(). This results in potential repetition of output from the RNG, output of non-random values, etc.

Fortunately, there's actually no point in hardware RNG drivers implementing the crypto_rng interface. It's not actually used by anything besides the "rng" algorithm type of AF_ALG, which in turn is not actually used in practice. Other crypto_rng hardware drivers are likewise being phased out, leaving just the hwrng support.

Thus, remove it to simplify the code and avoid conflict (and confusion) with the hwrng interface which is the one that actually matters.

index 1e6d772f4bb6..8aa23c939775 100644
@@ -80,6 +80,5 @@ config CRYPTO_DEV_HISI_TRNG
 	tristate "Support for HISI TRNG Driver"
 	depends on ARM64 && ACPI
 	select HW_RANDOM
-	select CRYPTO_RNG
 	help
 	  Support for HiSilicon TRNG Driver.