From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
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@xxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 1eac1279594d..58a53ec534aa 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -734,18 +734,11 @@ static void tpm_tis_gen_interrupt(struct tpm_chip *chip)
const char *desc = "attempting to generate an interrupt";
u32 cap2;
cap_t cap;
- int ret;
-
- ret = request_locality(chip, 0);
- if (ret < 0)
- return;
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
else
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
@@ -768,10 +761,16 @@ 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)
@@ -805,10 +804,12 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
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
--
2.36.1
