drivers: misc: ti-st: fix review comments

Based on comments from Jiri Slaby, drop the register
storage specifier, remove the unused code, cleanup
the const to non-const type casting.
Also make the line discipline ops structure static, since
its a singleton, unmodified structure which need not be
in heap.

Reported-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 25 insertions, 65 deletions

diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index 9bae0eb26b96..f9aad06d1ae5 100644
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -31,15 +31,6 @@
 #include <net/bluetooth/hci.h>
 #include <linux/ti_wilink_st.h>
 
-/* strings to be used for rfkill entries and by
- * ST Core to be used for sysfs debug entry
- */
-#define PROTO_ENTRY(type, name) name
-const unsigned char *protocol_strngs[] = {
-        PROTO_ENTRY(ST_BT, "Bluetooth"),
-        PROTO_ENTRY(ST_FM, "FM"),
-        PROTO_ENTRY(ST_GPS, "GPS"),
-};
 /* function pointer pointing to either,
  * st_kim_recv during registration to receive fw download responses
  * st_int_recv after registration to receive proto stack responses
@@ -144,7 +135,7 @@ void st_reg_complete(struct st_data_s *st_gdata, char err)
 static inline int st_check_data_len(struct st_data_s *st_gdata,
         int protoid, int len)
 {
-        register int room = skb_tailroom(st_gdata->rx_skb);
+        int room = skb_tailroom(st_gdata->rx_skb);
 
         pr_debug("len %d room %d", len, room);
 
@@ -187,7 +178,7 @@ static inline int st_check_data_len(struct st_data_s *st_gdata,
 static inline void st_wakeup_ack(struct st_data_s *st_gdata,
         unsigned char cmd)
 {
-        register struct sk_buff *waiting_skb;
+        struct sk_buff *waiting_skb;
         unsigned long flags = 0;
 
         spin_lock_irqsave(&st_gdata->lock, flags);
@@ -216,13 +207,13 @@ static inline void st_wakeup_ack(struct st_data_s *st_gdata,
 void st_int_recv(void *disc_data,
         const unsigned char *data, long count)
 {
-        register char *ptr;
+        char *ptr;
         struct hci_event_hdr *eh;
         struct hci_acl_hdr *ah;
         struct hci_sco_hdr *sh;
         struct fm_event_hdr *fm;
         struct gps_event_hdr *gps;
-        register int len = 0, type = 0, dlen = 0;
+        int len = 0, type = 0, dlen = 0;
         static enum proto_type protoid = ST_MAX;
         struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
 
@@ -918,34 +909,27 @@ static void st_tty_flush_buffer(struct tty_struct *tty)
         return;
 }
 
+static struct tty_ldisc_ops st_ldisc_ops = {
+        .magic = TTY_LDISC_MAGIC,
+        .name = "n_st",
+        .open = st_tty_open,
+        .close = st_tty_close,
+        .receive_buf = st_tty_receive,
+        .write_wakeup = st_tty_wakeup,
+        .flush_buffer = st_tty_flush_buffer,
+        .owner = THIS_MODULE
+};
+
 /********************************************************************/
 int st_core_init(struct st_data_s **core_data)
 {
         struct st_data_s *st_gdata;
         long err;
-        static struct tty_ldisc_ops *st_ldisc_ops;
-
-        /* populate and register to TTY line discipline */
-        st_ldisc_ops = kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL);
-        if (!st_ldisc_ops) {
-                pr_err("no mem to allocate");
-                return -ENOMEM;
-        }
 
-        st_ldisc_ops->magic = TTY_LDISC_MAGIC;
-        st_ldisc_ops->name = "n_st";    /*"n_hci"; */
-        st_ldisc_ops->open = st_tty_open;
-        st_ldisc_ops->close = st_tty_close;
-        st_ldisc_ops->receive_buf = st_tty_receive;
-        st_ldisc_ops->write_wakeup = st_tty_wakeup;
-        st_ldisc_ops->flush_buffer = st_tty_flush_buffer;
-        st_ldisc_ops->owner = THIS_MODULE;
-
-        err = tty_register_ldisc(N_TI_WL, st_ldisc_ops);
+        err = tty_register_ldisc(N_TI_WL, &st_ldisc_ops);
         if (err) {
                 pr_err("error registering %d line discipline %ld",
                            N_TI_WL, err);
-                kfree(st_ldisc_ops);
                 return err;
         }
         pr_debug("registered n_shared line discipline");
@@ -956,7 +940,6 @@ int st_core_init(struct st_data_s **core_data)
                 err = tty_unregister_ldisc(N_TI_WL);
                 if (err)
                         pr_err("unable to un-register ldisc %ld", err);
-                kfree(st_ldisc_ops);
                 err = -ENOMEM;
                 return err;
         }
@@ -970,22 +953,6 @@ int st_core_init(struct st_data_s **core_data)
         /* Locking used in st_int_enqueue() to avoid multiple execution */
         spin_lock_init(&st_gdata->lock);
 
-        /* ldisc_ops ref to be only used in __exit of module */
-        st_gdata->ldisc_ops = st_ldisc_ops;
-
-#if 0
-        err = st_kim_init();
-        if (err) {
-                pr_err("error during kim initialization(%ld)", err);
-                kfree(st_gdata);
-                err = tty_unregister_ldisc(N_TI_WL);
-                if (err)
-                        pr_err("unable to un-register ldisc");
-                kfree(st_ldisc_ops);
-                return -1;
-        }
-#endif
-
         err = st_ll_init(st_gdata);
         if (err) {
                 pr_err("error during st_ll initialization(%ld)", err);
@@ -993,7 +960,6 @@ int st_core_init(struct st_data_s **core_data)
                 err = tty_unregister_ldisc(N_TI_WL);
                 if (err)
                         pr_err("unable to un-register ldisc");
-                kfree(st_ldisc_ops);
                 return -1;
         }
         *core_data = st_gdata;
@@ -1007,11 +973,7 @@ void st_core_exit(struct st_data_s *st_gdata)
         err = st_ll_deinit(st_gdata);
         if (err)
                 pr_err("error during deinit of ST LL %ld", err);
-#if 0
-        err = st_kim_deinit();
-        if (err)
-                pr_err("error during deinit of ST KIM %ld", err);
-#endif
+
         if (st_gdata != NULL) {
                 /* Free ST Tx Qs and skbs */
                 skb_queue_purge(&st_gdata->txq);
@@ -1022,7 +984,6 @@ void st_core_exit(struct st_data_s *st_gdata)
                 err = tty_unregister_ldisc(N_TI_WL);
                 if (err)
                         pr_err("unable to un-register ldisc %ld", err);
-                kfree(st_gdata->ldisc_ops);
                 /* free the global data pointer */