firmware: turris-mox-rwtm: Use container_of() instead of hwrng .priv member

Use container_of() to get driver private structure from hwnrg structure,
instead of the hwrng's .priv member, as suggested by Herbert for another
driver.

Link: https://lore.kernel.org/soc/ZmLhQBdmg613KdET@gondor.apana.org.au/
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240831092050.23093-14-kabel@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/firmware/turris-mox-rwtm.c b/drivers/firmware/turris-mox-rwtm.c
index 9f6bda969943dc8f2a8fdb61b352b98ea317c37c..52f97235c3a69cfcf4824c610dffd58b92576b76 100644 (file)
--- a/drivers/firmware/turris-mox-rwtm.c
+++ b/drivers/firmware/turris-mox-rwtm.c
@@ -259,7 +259,7 @@ static int check_get_random_support(struct mox_rwtm *rwtm)
 
 static int mox_hwrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
-       struct mox_rwtm *rwtm = (struct mox_rwtm *) rng->priv;
+       struct mox_rwtm *rwtm = container_of(rng, struct mox_rwtm, hwrng);
        struct armada_37xx_rwtm_tx_msg msg;
        int ret;
 
@@ -487,7 +487,6 @@ static int turris_mox_rwtm_probe(struct platform_device *pdev)
 
        rwtm->hwrng.name = DRIVER_NAME "_hwrng";
        rwtm->hwrng.read = mox_hwrng_read;
-       rwtm->hwrng.priv = (unsigned long) rwtm;
 
        ret = devm_hwrng_register(dev, &rwtm->hwrng);
        if (ret)