[PATCH v10 06/15] mmc: crypto: add mmc_from_crypto_profile()

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Add a helper function that encapsulates a container_of expression.  For
now there is just one user but soon there will be more.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 drivers/mmc/host/cqhci-crypto.c | 5 +----
 include/linux/mmc/host.h        | 8 ++++++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/cqhci-crypto.c b/drivers/mmc/host/cqhci-crypto.c
index d5f4b6972f63..2951911d3f78 100644
--- a/drivers/mmc/host/cqhci-crypto.c
+++ b/drivers/mmc/host/cqhci-crypto.c
@@ -23,14 +23,11 @@ static const struct cqhci_crypto_alg_entry {
 };
 
 static inline struct cqhci_host *
 cqhci_host_from_crypto_profile(struct blk_crypto_profile *profile)
 {
-	struct mmc_host *mmc =
-		container_of(profile, struct mmc_host, crypto_profile);
-
-	return mmc->cqe_private;
+	return mmc_from_crypto_profile(profile)->cqe_private;
 }
 
 static int cqhci_crypto_program_key(struct cqhci_host *cq_host,
 				    const union cqhci_crypto_cfg_entry *cfg,
 				    int slot)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index f166d6611ddb..68f09a955a90 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -588,10 +588,18 @@ static inline void *mmc_priv(struct mmc_host *host)
 static inline struct mmc_host *mmc_from_priv(void *priv)
 {
 	return container_of(priv, struct mmc_host, private);
 }
 
+#ifdef CONFIG_MMC_CRYPTO
+static inline struct mmc_host *
+mmc_from_crypto_profile(struct blk_crypto_profile *profile)
+{
+	return container_of(profile, struct mmc_host, crypto_profile);
+}
+#endif
+
 #define mmc_host_is_spi(host)	((host)->caps & MMC_CAP_SPI)
 
 #define mmc_dev(x)	((x)->parent)
 #define mmc_classdev(x)	(&(x)->class_dev)
 #define mmc_hostname(x)	(dev_name(&(x)->class_dev))
-- 
2.47.1