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From:   john.hubbard@gmail.com
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Subject: [PATCH 16/34] drivers/tee: convert put_page() to put_user_page*()
Date:   Thu,  1 Aug 2019 19:19:47 -0700
Message-Id: <20190802022005.5117-17-jhubbard@nvidia.com>
In-Reply-To: <20190802022005.5117-1-jhubbard@nvidia.com>
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From: John Hubbard <jhubbard@nvidia.com>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/tee/tee_shm.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 2da026fd12c9..c967d0420b67 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -31,16 +31,13 @@ static void tee_shm_release(struct tee_shm *shm)
 
 		poolm->ops->free(poolm, shm);
 	} else if (shm->flags & TEE_SHM_REGISTER) {
-		size_t n;
 		int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
 
 		if (rc)
 			dev_err(teedev->dev.parent,
 				"unregister shm %p failed: %d", shm, rc);
 
-		for (n = 0; n < shm->num_pages; n++)
-			put_page(shm->pages[n]);
-
+		put_user_pages(shm->pages, shm->num_pages);
 		kfree(shm->pages);
 	}
 
@@ -313,16 +310,13 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
 	return shm;
 err:
 	if (shm) {
-		size_t n;
-
 		if (shm->id >= 0) {
 			mutex_lock(&teedev->mutex);
 			idr_remove(&teedev->idr, shm->id);
 			mutex_unlock(&teedev->mutex);
 		}
 		if (shm->pages) {
-			for (n = 0; n < shm->num_pages; n++)
-				put_page(shm->pages[n]);
+			put_user_pages(shm->pages, shm->num_pages);
 			kfree(shm->pages);
 		}
 	}
-- 
2.22.0