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tee: amdtee: check TEE status during driver initialization

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The AMD-TEE driver should check if TEE is available before
registering itself with TEE subsystem. This ensures that
there is a TEE which the driver can talk to before proceeding
with tee device node allocation.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Co-developed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com>
Reviewed-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Rijo Thomas
2019-12-27 10:54:02 +05:30
committed by Herbert Xu
parent 757cc3e9ff
commit bade7e1fbd
3 changed files with 35 additions and 0 deletions
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11
drivers/crypto/ccp/tee-dev.c
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@@ -362,3 +362,14 @@ int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, size_t len,
return 0;
}
EXPORT_SYMBOL(psp_tee_process_cmd);
int psp_check_tee_status(void)
{
struct psp_device *psp = psp_get_master_device();
if (!psp || !psp->tee_data)
return -ENODEV;
return 0;
}
EXPORT_SYMBOL(psp_check_tee_status);