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n_gsm: introduce enum gsm_dlci_mode

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gsm_dlci->mode is clearly an enumeration. So introduce one and use it
-- compiler now checks if valid values are assigned to the field.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200219084949.28074-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2020-02-19 09:49:42 +01:00 committed by Greg Kroah-Hartman
parent 72ae8cc192
commit e1785996f4
1 changed files with 6 additions and 3 deletions
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9
drivers/tty/n_gsm.c
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@ -107,6 +107,11 @@ enum gsm_dlci_state {
DLCI_CLOSING, /* Sending DISC not seen UA/DM */
};
enum gsm_dlci_mode {
DLCI_MODE_ABM, /* Normal Asynchronous Balanced Mode */
DLCI_MODE_ADM, /* Asynchronous Disconnected Mode */
};
/*
* Each active data link has a gsm_dlci structure associated which ties
* the link layer to an optional tty (if the tty side is open). To avoid
@ -124,9 +129,7 @@ struct gsm_dlci {
struct mutex mutex;
/* Link layer */
int mode;
#define DLCI_MODE_ABM 0 /* Normal Asynchronous Balanced Mode */
#define DLCI_MODE_ADM 1 /* Asynchronous Disconnected Mode */
enum gsm_dlci_mode mode;
spinlock_t lock; /* Protects the internal state */
struct timer_list t1; /* Retransmit timer for SABM and UA */
int retries;