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tpm, tpm_crb: fix unaligned read of the command buffer address

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The command buffer address must be read with exactly two 32-bit reads.
Otherwise, on some HW platforms, it seems that HW will abort the read
operation, which causes CPU to fill the read bytes with 1's. Therefore,
we cannot rely on memcpy_fromio() but must call ioread32() two times
instead.

Also, this matches the PC Client Platform TPM Profile specification,
which defines command buffer address with two 32-bit fields.

Cc: stable@kernel.org
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen 2015-09-15 20:05:40 +03:00 committed by Peter Huewe
parent 60ecd86c4d
commit 149789ce9d
1 changed files with 4 additions and 3 deletions
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7
drivers/char/tpm/tpm_crb.c
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@ -74,7 +74,8 @@ struct crb_control_area {
u32 int_enable;
u32 int_sts;
u32 cmd_size;
u64 cmd_pa;
u32 cmd_pa_low;
u32 cmd_pa_high;
u32 rsp_size;
u64 rsp_pa;
} __packed;
@ -273,8 +274,8 @@ static int crb_acpi_add(struct acpi_device *device)
return -ENOMEM;
}
memcpy_fromio(&pa, &priv->cca->cmd_pa, 8);
pa = le64_to_cpu(pa);
pa = ((u64) le32_to_cpu(ioread32(&priv->cca->cmd_pa_high)) << 32) |
(u64) le32_to_cpu(ioread32(&priv->cca->cmd_pa_low));
priv->cmd = devm_ioremap_nocache(dev, pa,
ioread32(&priv->cca->cmd_size));
if (!priv->cmd) {