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path: root/drivers/char/hvc_iucv.c
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Diffstat (limited to 'drivers/char/hvc_iucv.c')
-rw-r--r--drivers/char/hvc_iucv.c40
1 files changed, 28 insertions, 12 deletions
diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c
index 7b62736..a534968 100644
--- a/drivers/char/hvc_iucv.c
+++ b/drivers/char/hvc_iucv.c
@@ -60,6 +60,7 @@ enum tty_state_t {
struct hvc_iucv_private {
struct hvc_struct *hvc; /* HVC struct reference */
u8 srv_name[8]; /* IUCV service name (ebcdic) */
+ unsigned char is_console; /* Linux console usage flag */
enum iucv_state_t iucv_state; /* IUCV connection status */
enum tty_state_t tty_state; /* TTY status */
struct iucv_path *path; /* IUCV path pointer */
@@ -93,6 +94,7 @@ static unsigned long hvc_iucv_devices = 1;
/* Array of allocated hvc iucv tty lines... */
static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];
+#define IUCV_HVC_CON_IDX (0)
/* Kmem cache and mempool for iucv_tty_buffer elements */
static struct kmem_cache *hvc_iucv_buffer_cache;
@@ -139,7 +141,7 @@ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
bufp = mempool_alloc(hvc_iucv_mempool, flags);
if (!bufp)
return NULL;
- memset(bufp, 0, sizeof(struct iucv_tty_buffer));
+ memset(bufp, 0, sizeof(*bufp));
if (size > 0) {
bufp->msg.length = MSG_SIZE(size);
@@ -463,7 +465,7 @@ static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count)
* @id: Additional data (originally passed to hvc_alloc): the index of an struct
* hvc_iucv_private instance.
*
- * The function sets the tty state to TTY_OPEN for the struct hvc_iucv_private
+ * The function sets the tty state to TTY_OPENED for the struct hvc_iucv_private
* instance that is derived from @id. Always returns 0.
*
* Locking: struct hvc_iucv_private->lock, spin_lock_bh
@@ -707,6 +709,9 @@ static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
/* If the tty has not yet been opened, clean up the hvc_iucv_private
* structure to allow re-connects.
+ * This is also done for our console device because console hangups
+ * are handled specially and no notifier is called by HVC.
+ * The tty session is active (TTY_OPEN) and ready for re-connects...
*
* If it has been opened, let get_chars() return -EPIPE to signal the
* HVC layer to hang up the tty.
@@ -716,7 +721,11 @@ static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
if (priv->tty_state == TTY_CLOSED)
hvc_iucv_cleanup(priv);
else
- hvc_kick();
+ if (priv->is_console) {
+ hvc_iucv_cleanup(priv);
+ priv->tty_state = TTY_OPENED;
+ } else
+ hvc_kick();
spin_unlock(&priv->lock);
/* finally sever path (outside of priv->lock due to lock ordering) */
@@ -747,7 +756,6 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
return;
}
-
spin_lock(&priv->lock);
/* reject messages if tty has not yet been opened */
@@ -814,13 +822,14 @@ static struct hv_ops hvc_iucv_ops = {
/**
* hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
- * @id: hvc_iucv_table index
+ * @id: hvc_iucv_table index
+ * @is_console: Flag if the instance is used as Linux console
*
* This function allocates a new hvc_iucv_private structure and stores
* the instance in hvc_iucv_table at index @id.
* Returns 0 on success; otherwise non-zero.
*/
-static int __init hvc_iucv_alloc(int id)
+static int __init hvc_iucv_alloc(int id, unsigned int is_console)
{
struct hvc_iucv_private *priv;
char name[9];
@@ -842,6 +851,9 @@ static int __init hvc_iucv_alloc(int id)
return -ENOMEM;
}
+ /* set console flag */
+ priv->is_console = is_console;
+
/* finally allocate hvc */
priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /* PAGE_SIZE */
HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256);
@@ -869,7 +881,8 @@ static int __init hvc_iucv_alloc(int id)
*/
static int __init hvc_iucv_init(void)
{
- int rc, i;
+ int rc;
+ unsigned int i;
if (!MACHINE_IS_VM) {
pr_info("The z/VM IUCV HVC device driver cannot "
@@ -901,14 +914,16 @@ static int __init hvc_iucv_init(void)
/* register the first terminal device as console
* (must be done before allocating hvc terminal devices) */
- rc = hvc_instantiate(HVC_IUCV_MAGIC, 0, &hvc_iucv_ops);
- if (rc)
- pr_warning("Registering HVC terminal device as "
- "Linux console failed\n");
+ rc = hvc_instantiate(HVC_IUCV_MAGIC, IUCV_HVC_CON_IDX, &hvc_iucv_ops);
+ if (rc) {
+ pr_err("Registering HVC terminal device as "
+ "Linux console failed\n");
+ goto out_error_memory;
+ }
/* allocate hvc_iucv_private structs */
for (i = 0; i < hvc_iucv_devices; i++) {
- rc = hvc_iucv_alloc(i);
+ rc = hvc_iucv_alloc(i, (i == IUCV_HVC_CON_IDX) ? 1 : 0);
if (rc) {
pr_err("Creating a new HVC terminal device "
"failed with error code=%d\n", rc);
@@ -935,6 +950,7 @@ out_error_hvc:
hvc_remove(hvc_iucv_table[i]->hvc);
kfree(hvc_iucv_table[i]);
}
+out_error_memory:
mempool_destroy(hvc_iucv_mempool);
kmem_cache_destroy(hvc_iucv_buffer_cache);
return rc;
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