[Xen-devel] [PATCH v3 3/3] Use separate struct console structure for each hvc_console.

[Miche Baker-Harvey <miche@xxxxxxxxxx>]

It is possible to make any virtio_console port be a console
by sending VIRITO_CONSOLE_CONSOLE_PORT.  But hvc_alloc was
using a single struct console hvc_console, which contains
both an index and flags which are per-port.

This adds a separate struct console for each virtio_console
that is CONSOLE_PORT.

Signed-off-by: Miche Baker-Harvey <miche@xxxxxxxxxx>
---
 drivers/tty/hvc/hvc_console.c |   20 ++++++++++++++++++++
 drivers/tty/hvc/hvc_console.h |    1 +
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 09a6159..24a84d6 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -247,6 +247,7 @@ static void destroy_hvc_struct(struct kref *kref)
 
        spin_unlock(&hvc_structs_lock);
 
+       kfree(hp->hvc_console);
        kfree(hp);
 }
 
@@ -827,6 +828,7 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
                             int outbuf_size)
 {
        struct hvc_struct *hp;
+       struct console *cp;
        int i;
 
        /* We wait until a driver actually comes along */
@@ -854,6 +856,17 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
        kref_init(&hp->kref);
 
        INIT_WORK(&hp->tty_resize, hvc_set_winsz);
+       /*
+        * Make each console its own struct console.
+        */
+       cp = kmemdup(&hvc_console, sizeof(*cp), GFP_KERNEL);
+       if (!cp) {
+               kfree(hp);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       hp->hvc_console = cp;
+
        spin_lock_init(&hp->lock);
        spin_lock(&hvc_structs_lock);
 
@@ -872,8 +885,13 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 
        hp->index = i;
 
+       cp->index = i;
+       vtermnos[i] = vtermno;
+       cons_ops[i] = ops;
+
        list_add_tail(&(hp->next), &hvc_structs);
        spin_unlock(&hvc_structs_lock);
+       register_console(cp);
 
        return hp;
 }
@@ -884,6 +902,8 @@ int hvc_remove(struct hvc_struct *hp)
        unsigned long flags;
        struct tty_struct *tty;
 
+       BUG_ON(!hp->hvc_console);
+       unregister_console(hp->hvc_console);
        spin_lock_irqsave(&hp->lock, flags);
        tty = tty_kref_get(hp->tty);
 
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index c335a14..2d20ab7 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -58,6 +58,7 @@ struct hvc_struct {
        const struct hv_ops *ops;
        int irq_requested;
        int data;
+       struct console *hvc_console;
        struct winsize ws;
        struct work_struct tty_resize;
        struct list_head next;


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