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crypto: ccp - Get a free page to use while fetching initial nonce

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[ Upstream commit 53f7f779f4 ]

dbc_dev_init() gets a free page from `GFP_KERNEL`, but if that page has
any data in it the first nonce request will fail.
This prevents dynamic boost control from probing. To fix this, explicitly
request a zeroed page with `__GFP_ZERO` to ensure first nonce fetch works.

Fixes: c04cf9e14f ("crypto: ccp - Add support for fetching a nonce for dynamic boost control")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mario Limonciello 2023-08-29 10:07:55 -05:00 committed by Greg Kroah-Hartman
parent 93a2477b87
commit 4c2c057d77
1 changed files with 1 additions and 1 deletions
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2
drivers/crypto/ccp/dbc.c
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@ -205,7 +205,7 @@ int dbc_dev_init(struct psp_device *psp)
return -ENOMEM;
BUILD_BUG_ON(sizeof(union dbc_buffer) > PAGE_SIZE);
dbc_dev->mbox = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
dbc_dev->mbox = (void *)devm_get_free_pages(dev, GFP_KERNEL | __GFP_ZERO, 0);
if (!dbc_dev->mbox) {
ret = -ENOMEM;
goto cleanup_dev;