From: Mario Limonciello mario.limonciello@amd.com
stable inclusion from stable-v6.6.2 commit 4c2c057d771c956c6a4504a46ed416725bbe50ee category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 53f7f779f45cbe1771bc4ae05f0320e204a18611 ]
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: c04cf9e14f10 ("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 Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/crypto/ccp/dbc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c index 839ea14b9a85..6f33149ef80d 100644 --- a/drivers/crypto/ccp/dbc.c +++ b/drivers/crypto/ccp/dbc.c @@ -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;