6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mario Limonciello mario.limonciello@amd.com
[ 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 --- 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 839ea14b9a853..6f33149ef80df 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;