diff options
| author | Lino Sanfilippo <l.sanfilippo@kunbus.com> | 2022-11-24 14:55:29 +0100 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2023-04-24 16:15:53 +0300 |
| commit | 15d7aa4e46eba87242a320f39773aa16faddadee (patch) | |
| tree | 3ac972989c5c3322037dec362e0f79736677ffba /drivers/char/tpm | |
| parent | ed9be0e6c892a783800d77a41ca4c7255c6af8c5 (diff) | |
| download | linux-15d7aa4e46eba87242a320f39773aa16faddadee.tar.gz | |
tpm, tpm_tis: Claim locality before writing interrupt registers
In tpm_tis_probe_single_irq() interrupt registers TPM_INT_VECTOR,
TPM_INT_STATUS and TPM_INT_ENABLE are modified to setup the interrupts.
Currently these modifications are done without holding a locality thus they
have no effect. Fix this by claiming the (default) locality before the
registers are written.
Since now tpm_tis_gen_interrupt() is called with the locality already
claimed remove locality request and release from this function.
Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index b5338e522a455..f70c1d95bc03a 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -740,16 +740,10 @@ static void tpm_tis_gen_interrupt(struct tpm_chip *chip) cap_t cap; int ret; - ret = request_locality(chip, 0); - if (ret < 0) - return; - if (chip->flags & TPM_CHIP_FLAG_TPM2) ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); else ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0); - - release_locality(chip, 0); } /* Register the IRQ and issue a command that will cause an interrupt. If an @@ -772,10 +766,16 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, } priv->irq = irq; + rc = request_locality(chip, 0); + if (rc < 0) + return rc; + rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), &original_int_vec); - if (rc < 0) + if (rc < 0) { + release_locality(chip, priv->locality); return rc; + } rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq); if (rc < 0) @@ -809,10 +809,12 @@ restore_irqs: if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { tpm_tis_write8(priv, original_int_vec, TPM_INT_VECTOR(priv->locality)); - return -1; + rc = -1; } - return 0; + release_locality(chip, priv->locality); + + return rc; } /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that |