@@ -173,6 +173,20 @@ struct gsm_control {
int error; /* Error if any */
};
+enum gsm_mux_state {
+ GSM_SEARCH,
+ GSM_START,
+ GSM_ADDRESS,
+ GSM_CONTROL,
+ GSM_LEN,
+ GSM_DATA,
+ GSM_FCS,
+ GSM_OVERRUN,
+ GSM_LEN0,
+ GSM_LEN1,
+ GSM_SSOF,
+};
+
/*
* Each GSM mux we have is represented by this structure. If we are
* operating as an ldisc then we use this structure as our ldisc
@@ -197,18 +211,7 @@ struct gsm_mux {
/* Framing Layer */
unsigned char *buf;
- int state;
-#define GSM_SEARCH 0
-#define GSM_START 1
-#define GSM_ADDRESS 2
-#define GSM_CONTROL 3
-#define GSM_LEN 4
-#define GSM_DATA 5
-#define GSM_FCS 6
-#define GSM_OVERRUN 7
-#define GSM_LEN0 8
-#define GSM_LEN1 9
-#define GSM_SSOF 10
+ enum gsm_mux_state state;
unsigned int len;
unsigned int address;
unsigned int count;
@@ -1934,6 +1937,9 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c)
break;
}
break;
+ default:
+ pr_debug("%s: unhandled state: %d\n", __func__, gsm->state);
+ break;
}
}
@@ -2008,6 +2014,9 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c)
break;
case GSM_OVERRUN: /* Over-long - eg a dropped SOF */
break;
+ default:
+ pr_debug("%s: unhandled state: %d\n", __func__, gsm->state);
+ break;
}
}
gsm_mux->state is clearly an enumeration. So introduce one and use it -- compiler now checks if valid values are assigned to the field. Note that a compiler warns about unhandled cases in switch. Add default cases with a pr_debug (which is not printed by default). The values of the states are preserved thanks to the nature of enum. Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/tty/n_gsm.c | 33 +++++++++++++++++++++------------ 1 file changed, 21 insertions(+), 12 deletions(-)