linux-kernel - [RFC 16/32] misc: handle HAS

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Message-Id: <20211227164317.4146918-17-schnelle@linux.ibm.com>
Date:   Mon, 27 Dec 2021 17:43:01 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-csky@...r.kernel.org
Subject: [RFC 16/32] misc: handle HAS_IOPORT dependencies

In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
not being declared. We thus need to add HAS_IOPORT as dependency for
those drivers using them.

Co-developed-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...nel.org>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 drivers/misc/altera-stapl/Makefile | 3 ++-
 drivers/misc/altera-stapl/altera.c | 6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/altera-stapl/Makefile b/drivers/misc/altera-stapl/Makefile
index dd0f8189666b..90f18e7bf9b0 100644
--- a/drivers/misc/altera-stapl/Makefile
+++ b/drivers/misc/altera-stapl/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
-altera-stapl-objs = altera-lpt.o altera-jtag.o altera-comp.o altera.o
+altera-stapl-y = altera-jtag.o altera-comp.o altera.o
+altera-stapl-$(CONFIG_HAS_IOPORT) += altera-lpt.o
 
 obj-$(CONFIG_ALTERA_STAPL) += altera-stapl.o
diff --git a/drivers/misc/altera-stapl/altera.c b/drivers/misc/altera-stapl/altera.c
index 92c0611034b0..c7ae64de8bb4 100644
--- a/drivers/misc/altera-stapl/altera.c
+++ b/drivers/misc/altera-stapl/altera.c
@@ -2431,6 +2431,10 @@ int altera_init(struct altera_config *config, const struct firmware *fw)
 
 	astate->config = config;
 	if (!astate->config->jtag_io) {
+		if (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
+			retval = -ENODEV;
+			goto free_state;
+		}
 		dprintk("%s: using byteblaster!\n", __func__);
 		astate->config->jtag_io = netup_jtag_io_lpt;
 	}
@@ -2505,7 +2509,7 @@ int altera_init(struct altera_config *config, const struct firmware *fw)
 
 	} else if (exec_result)
 		printk(KERN_ERR "%s: error %d\n", __func__, exec_result);
-
+free_state:
 	kfree(astate);
 free_value:
 	kfree(value);
-- 
2.32.0