hwrng: cctrng - Fix runtime PM usage counter leak

pm_runtime_get_sync() increments the device usage counter even when
runtime resume fails. cctrng_read() propagates errors from
cc_trng_pm_get() without scheduling the work that later drops the
counter, so a clock or reset-completion failure in cctrng_resume()
leaves the counter elevated.

Use pm_runtime_resume_and_get(), which drops the usage counter when
resume fails and returns zero on success. This preserves the existing
success path while balancing the error path.

This issue was found by a static analysis checker and confirmed by
manual source review.

Fixes: a583ed310bb6 ("hwrng: cctrng - introduce Arm CryptoCell driver")
Signed-off-by: Ruoyu Wang <ruoyuw560@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

0 files changed, 0 insertions, 0 deletions