> -----Original Message----- > From: Pali Rohár [mailto:pali.rohar@xxxxxxxxx] > Sent: Thursday, October 19, 2017 1:09 PM > To: Limonciello, Mario <Mario_Limonciello@xxxxxxxx> > Cc: dvhart@xxxxxxxxxxxxx; Andy Shevchenko <andy.shevchenko@xxxxxxxxx>; > LKML <linux-kernel@xxxxxxxxxxxxxxx>; platform-driver-x86@xxxxxxxxxxxxxxx; Andy > Lutomirski <luto@xxxxxxxxxx>; quasisec@xxxxxxxxxx; rjw@xxxxxxxxxxxxx; > mjg59@xxxxxxxxxx; hch@xxxxxx; Greg KH <greg@xxxxxxxxx>; Alan Cox > <gnomes@xxxxxxxxxxxxxxxxxxx> > Subject: Re: [PATCH v10 11/15] platform/x86: dell-smbios-smm: test for WSMT > > On Thursday 19 October 2017 12:50:14 Mario Limonciello wrote: > > +/* When enabled this indicates that SMM won't work */ > > +static bool test_wsmt_enabled(void) > > +{ > > + struct calling_interface_token *token; > > + > > + /* if token doesn't exist, SMM will work */ > > + token = dell_smbios_find_token(WSMT_EN_TOKEN); > > + if (!token) > > + return false; > > + > > + /* if token exists, try to access over SMM */ > > + buffer->class = CLASS_TOKEN_READ; > > + buffer->select = SELECT_TOKEN_STD; > > + memset(buffer, 0, sizeof(struct calling_interface_buffer)); > > + buffer->input[0] = token->location; > > + dell_smbios_smm_call(buffer); > > + > > + /* if lookup failed, we know WSMT was enabled */ > > + if (buffer->output[0] != 0) > > + return true; > > + > > + /* query token status if it didn't fail */ > > + return (buffer->output[1] == token->value); > > +} > > + > > static int __init dell_smbios_smm_init(void) > > { > > int ret; > > @@ -115,6 +140,13 @@ static int __init dell_smbios_smm_init(void) > > > > dmi_walk(find_cmd_address, NULL); > > > > + ret = test_wsmt_enabled(); > > ret is int, but test_wsmt_enabled() returns bool. Yes, ret is re-used within this method. 0, 1 enum is a subset of int, so this seemed like a logical thing to me to do.
