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Date:   Thu, 25 Mar 2021 21:26:03 +0000
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Message-Id: <20210325212609.492188-3-satyat@google.com>
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Subject: [PATCH v2 2/8] dm,mmc,ufshcd: handle error from blk_ksm_register()
From:   Satya Tangirala <satyat@google.com>
To:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Jens Axboe <axboe@kernel.dk>, Eric Biggers <ebiggers@google.com>,
        Satya Tangirala <satyat@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Handle any error from blk_ksm_register() in the callers. Previously,
the callers ignored the return value because blk_ksm_register() wouldn't
fail as long as the request_queue didn't have integrity support too, but
as this is no longer the case, it's safer for the callers to just handle
the return value appropriately.

Signed-off-by: Satya Tangirala <satyat@google.com>
---
 drivers/md/dm-table.c            | 3 ++-
 drivers/mmc/core/crypto.c        | 6 ++++--
 drivers/scsi/ufs/ufshcd-crypto.c | 6 ++++--
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index db18a58adad7..1225b9050f29 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1372,7 +1372,8 @@ static void dm_update_keyslot_manager(struct request_queue *q,
 
 	/* Make the ksm less restrictive */
 	if (!q->ksm) {
-		blk_ksm_register(t->ksm, q);
+		if (WARN_ON(!blk_ksm_register(t->ksm, q)))
+			dm_destroy_keyslot_manager(t->ksm);
 	} else {
 		blk_ksm_update_capabilities(q->ksm, t->ksm);
 		dm_destroy_keyslot_manager(t->ksm);
diff --git a/drivers/mmc/core/crypto.c b/drivers/mmc/core/crypto.c
index 419a368f8402..616103393557 100644
--- a/drivers/mmc/core/crypto.c
+++ b/drivers/mmc/core/crypto.c
@@ -21,8 +21,10 @@ void mmc_crypto_set_initial_state(struct mmc_host *host)
 
 void mmc_crypto_setup_queue(struct request_queue *q, struct mmc_host *host)
 {
-	if (host->caps2 & MMC_CAP2_CRYPTO)
-		blk_ksm_register(&host->ksm, q);
+	if (host->caps2 & MMC_CAP2_CRYPTO) {
+		if (WARN_ON(!blk_ksm_register(&host->ksm, q)))
+			host->caps2 &= ~MMC_CAP2_CRYPTO;
+	}
 }
 EXPORT_SYMBOL_GPL(mmc_crypto_setup_queue);
 
diff --git a/drivers/scsi/ufs/ufshcd-crypto.c b/drivers/scsi/ufs/ufshcd-crypto.c
index d70cdcd35e43..f47a72fefe9e 100644
--- a/drivers/scsi/ufs/ufshcd-crypto.c
+++ b/drivers/scsi/ufs/ufshcd-crypto.c
@@ -233,6 +233,8 @@ void ufshcd_init_crypto(struct ufs_hba *hba)
 void ufshcd_crypto_setup_rq_keyslot_manager(struct ufs_hba *hba,
 					    struct request_queue *q)
 {
-	if (hba->caps & UFSHCD_CAP_CRYPTO)
-		blk_ksm_register(&hba->ksm, q);
+	if (hba->caps & UFSHCD_CAP_CRYPTO) {
+		if (WARN_ON(!blk_ksm_register(&hba->ksm, q)))
+			hba->caps &= ~UFSHCD_CAP_CRYPTO;
+	}
 }
-- 
2.31.0.291.g576ba9dcdaf-goog