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tty: n_gsm: add helpers to convert mux-num to/from tty-base

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Make it obvious how the gsm mux number relates to the virtual tty lines
by using helper functions instead of shifting 6 bits.

Signed-off-by: Martin Hundebøll <martin@geanix.com>
Link: https://lore.kernel.org/r/20190710192656.60381-3-martin@geanix.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Hundebøll 2019-07-10 21:26:55 +02:00 committed by Greg Kroah-Hartman
parent a64d19aa0e
commit 43a9e710cb
1 changed files with 15 additions and 4 deletions
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19
drivers/tty/n_gsm.c
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@ -2171,6 +2171,16 @@ static inline void mux_put(struct gsm_mux *gsm)
kref_put(&gsm->ref, gsm_free_muxr);
}
static inline unsigned int mux_num_to_base(struct gsm_mux *gsm)
{
return gsm->num * NUM_DLCI;
}
static inline unsigned int mux_line_to_num(unsigned int line)
{
return line / NUM_DLCI;
}
/**
* gsm_alloc_mux - allocate a mux
*
@ -2351,7 +2361,8 @@ static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
{
int ret, i, base;
unsigned int base;
int ret, i;
gsm->tty = tty_kref_get(tty);
gsm->output = gsmld_output;
@ -2361,7 +2372,7 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
else {
/* Don't register device 0 - this is the control channel and not
a usable tty interface */
base = gsm->num << 6; /* Base for this MUX */
base = mux_num_to_base(gsm); /* Base for this MUX */
for (i = 1; i < NUM_DLCI; i++)
tty_register_device(gsm_tty_driver, base + i, NULL);
}
@ -2379,8 +2390,8 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
{
unsigned int base = mux_num_to_base(gsm); /* Base for this MUX */
int i;
int base = gsm->num << 6; /* Base for this MUX */
WARN_ON(tty != gsm->tty);
for (i = 1; i < NUM_DLCI; i++)
@ -2908,7 +2919,7 @@ static int gsmtty_install(struct tty_driver *driver, struct tty_struct *tty)
struct gsm_mux *gsm;
struct gsm_dlci *dlci;
unsigned int line = tty->index;
unsigned int mux = line >> 6;
unsigned int mux = mux_line_to_num(line);
bool alloc = false;
int ret;