misc: bcm-vk: only support ttyVK if CONFIG_TTY is set

Correct compile issue if CONFIG_TTY is not set by
only adding ttyVK devices if CONFIG_BCM_VK_TTY is set.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Link: https://lore.kernel.org/r/20210203223826.21674-1-scott.branden@broadcom.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/bcm-vk/Kconfig

@@ -15,3 +15,15 @@ config BCM_VK
 	  accelerators via /dev/bcm-vk.N devices.
 
 	  If unsure, say N.
+
+config BCM_VK_TTY
+	bool "Enable tty ports on a Broadcom VK Accelerator device"
+	depends on TTY
+	depends on BCM_VK
+	help
+	  Select this option to enable tty support to allow console
+	  access to Broadcom VK Accelerator cards from host.
+
+	  Device node will in the form /dev/bcm-vk.x_ttyVKy where:
+	  x is the instance of the VK card
+	  y is the tty device number on the VK card.

drivers/misc/bcm-vk/Makefile

@@ -7,6 +7,6 @@ obj-$(CONFIG_BCM_VK) += bcm_vk.o
 bcm_vk-objs := \
 	bcm_vk_dev.o \
 	bcm_vk_msg.o \
-	bcm_vk_sg.o \
-	bcm_vk_tty.o
+	bcm_vk_sg.o
 
+bcm_vk-$(CONFIG_BCM_VK_TTY) += bcm_vk_tty.o

drivers/misc/bcm-vk/bcm_vk.h

@@ -258,7 +258,11 @@ enum pci_barno {
 	BAR_2
 };
 
+#ifdef CONFIG_BCM_VK_TTY
 #define BCM_VK_NUM_TTY 2
+#else
+#define BCM_VK_NUM_TTY 0
+#endif
 
 struct bcm_vk_tty {
 	struct tty_port port;
@@ -366,11 +370,13 @@ struct bcm_vk {
 	struct miscdevice miscdev;
 	int devid; /* dev id allocated */
 
+#ifdef CONFIG_BCM_VK_TTY
 	struct tty_driver *tty_drv;
 	struct timer_list serial_timer;
 	struct bcm_vk_tty tty[BCM_VK_NUM_TTY];
 	struct workqueue_struct *tty_wq_thread;
 	struct work_struct tty_wq_work;
+#endif
 
 	/* Reference-counting to handle file operations */
 	struct kref kref;
@@ -501,13 +507,43 @@ int bcm_vk_send_shutdown_msg(struct bcm_vk *vk, u32 shut_type,
 			     const pid_t pid, const u32 q_num);
 void bcm_to_v_q_doorbell(struct bcm_vk *vk, u32 q_num, u32 db_val);
 int bcm_vk_auto_load_all_images(struct bcm_vk *vk);
-int bcm_vk_tty_init(struct bcm_vk *vk, char *name);
-void bcm_vk_tty_exit(struct bcm_vk *vk);
-void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk);
 void bcm_vk_hb_init(struct bcm_vk *vk);
 void bcm_vk_hb_deinit(struct bcm_vk *vk);
 void bcm_vk_handle_notf(struct bcm_vk *vk);
 bool bcm_vk_drv_access_ok(struct bcm_vk *vk);
 void bcm_vk_set_host_alert(struct bcm_vk *vk, u32 bit_mask);
 
+#ifdef CONFIG_BCM_VK_TTY
+int bcm_vk_tty_init(struct bcm_vk *vk, char *name);
+void bcm_vk_tty_exit(struct bcm_vk *vk);
+void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk);
+void bcm_vk_tty_wq_exit(struct bcm_vk *vk);
+
+static inline void bcm_vk_tty_set_irq_enabled(struct bcm_vk *vk, int index)
+{
+	vk->tty[index].irq_enabled = true;
+}
+#else
+static inline int bcm_vk_tty_init(struct bcm_vk *vk, char *name)
+{
+	return 0;
+}
+
+static inline void bcm_vk_tty_exit(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_wq_exit(struct bcm_vk *vk)
+{
+}
+
+static inline void bcm_vk_tty_set_irq_enabled(struct bcm_vk *vk, int index)
+{
+}
+#endif /* CONFIG_BCM_VK_TTY */
+
 #endif

drivers/misc/bcm-vk/bcm_vk_dev.c

@@ -1397,7 +1397,7 @@ static int bcm_vk_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 				pdev->irq + vk->num_irqs, vk->num_irqs + 1);
 			goto err_irq;
 		}
-		vk->tty[i].irq_enabled = true;
+		bcm_vk_tty_set_irq_enabled(vk, i);
 	}
 
 	id = ida_simple_get(&bcm_vk_ida, 0, 0, GFP_KERNEL);
@@ -1582,8 +1582,7 @@ static void bcm_vk_remove(struct pci_dev *pdev)
 
 	cancel_work_sync(&vk->wq_work);
 	destroy_workqueue(vk->wq_thread);
-	cancel_work_sync(&vk->tty_wq_work);
-	destroy_workqueue(vk->tty_wq_thread);
+	bcm_vk_tty_wq_exit(vk);
 
 	for (i = 0; i < MAX_BAR; i++) {
 		if (vk->bar[i])

drivers/misc/bcm-vk/bcm_vk_tty.c

@@ -331,3 +331,9 @@ void bcm_vk_tty_terminate_tty_user(struct bcm_vk *vk)
 			kill_pid(find_vpid(vktty->pid), SIGKILL, 1);
 	}
 }
+
+void bcm_vk_tty_wq_exit(struct bcm_vk *vk)
+{
+	cancel_work_sync(&vk->tty_wq_work);
+	destroy_workqueue(vk->tty_wq_thread);
+}