ACPI: PCC: Release resources on address space setup failure path

The allocated memory for the pcc_data struct doesn't get freed under an
error path in pcc_mbox_request_channel() or acpi_os_ioremap(). Also, the
PCC mailbox channel doesn't get freed under an error path in
acpi_os_ioremap().

Fixes: 77e2a04 ("ACPI: PCC: Implement OperationRegion handler for the PCC Type 3 subtype")
Signed-off-by: Rafael Mendonca <[email protected]>
Reviewed-by: Sudeep Holla <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: rafaelmsoares

drivers/acpi/acpi_pcc.c

@@ -63,6 +63,7 @@ acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
 	if (IS_ERR(data->pcc_chan)) {
 		pr_err("Failed to find PCC channel for subspace %d\n",
 		       ctx->subspace_id);
+		kfree(data);
 		return AE_NOT_FOUND;
 	}
 
@@ -72,6 +73,8 @@ acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
 	if (!data->pcc_comm_addr) {
 		pr_err("Failed to ioremap PCC comm region mem for %d\n",
 		       ctx->subspace_id);
+		pcc_mbox_free_channel(data->pcc_chan);
+		kfree(data);
 		return AE_NO_MEMORY;
 	}