tpm: Do not remap from ACPI resources again for Pluton TPM

For Pluton TPM devices, it was assumed that there was no ACPI memory
regions. This is not true for ASUS ROG Ally. ACPI advertises
0xfd500000-0xfd5fffff.

Since remapping is already done in `crb_map_pluton`, remapping again
in `crb_map_io` causes EBUSY error:

[    3.510453] tpm_crb MSFT0101:00: can't request region for resource [mem 0xfd500000-0xfd5fffff]
[    3.510463] tpm_crb: probe of MSFT0101:00 failed with error -16

Cc: stable@vger.kernel.org # v6.3+
Fixes: 4d2732882703 ("tpm_crb: Add support for CRB devices based on Pluton")
Signed-off-by: Valentin David <valentin.david@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index d43a0d7b97a8995d34d3ef6ca60ecad25bfb818d..1a5d09b1851345306c45e5a2cf71d603e00fbc86 100644 (file)
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -563,15 +563,18 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
        u32 rsp_size;
        int ret;
 
-       INIT_LIST_HEAD(&acpi_resource_list);
-       ret = acpi_dev_get_resources(device, &acpi_resource_list,
-                                    crb_check_resource, iores_array);
-       if (ret < 0)
-               return ret;
-       acpi_dev_free_resource_list(&acpi_resource_list);
-
-       /* Pluton doesn't appear to define ACPI memory regions */
+       /*
+        * Pluton sometimes does not define ACPI memory regions.
+        * Mapping is then done in crb_map_pluton
+        */
        if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) {
+               INIT_LIST_HEAD(&acpi_resource_list);
+               ret = acpi_dev_get_resources(device, &acpi_resource_list,
+                                            crb_check_resource, iores_array);
+               if (ret < 0)
+                       return ret;
+               acpi_dev_free_resource_list(&acpi_resource_list);
+
                if (resource_type(iores_array) != IORESOURCE_MEM) {
                        dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
                        return -EINVAL;