isdn/gigaset: unify function return values
Various functions in the Gigaset driver were using different
conventions for the meaning of their int return values.
Align them to the usual negative error numbers convention.
Inspired-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c
index 6c306d4..aa41485 100644
--- a/drivers/isdn/gigaset/common.c
+++ b/drivers/isdn/gigaset/common.c
@@ -194,13 +194,13 @@
gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d",
bcs->channel);
spin_unlock_irqrestore(&bcs->cs->lock, flags);
- return 0;
+ return -EBUSY;
}
++bcs->use_count;
bcs->busy = 1;
gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
spin_unlock_irqrestore(&bcs->cs->lock, flags);
- return 1;
+ return 0;
}
struct bc_state *gigaset_get_free_channel(struct cardstate *cs)
@@ -258,7 +258,7 @@
spin_unlock_irqrestore(&cs->lock, flags);
gig_dbg(DEBUG_CHANNEL,
"could not allocate all channels");
- return 0;
+ return -EBUSY;
}
for (i = 0; i < cs->channels; ++i)
++cs->bcs[i].use_count;
@@ -266,7 +266,7 @@
gig_dbg(DEBUG_CHANNEL, "allocated all channels");
- return 1;
+ return 0;
}
void gigaset_free_channels(struct cardstate *cs)
@@ -388,8 +388,7 @@
int i;
gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
- if (!bcs->cs->ops->freebcshw(bcs))
- gig_dbg(DEBUG_INIT, "failed");
+ bcs->cs->ops->freebcshw(bcs);
gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
clear_at_state(&bcs->at_state);
@@ -566,6 +565,8 @@
* @inbuf: buffer structure.
* @src: received data.
* @numbytes: number of bytes received.
+ *
+ * Return value: !=0 if some data was appended
*/
int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
unsigned numbytes)
@@ -609,8 +610,8 @@
EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
/* Initialize the b-channel structure */
-static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
- struct cardstate *cs, int channel)
+static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
+ int channel)
{
int i;
@@ -649,11 +650,7 @@
bcs->apconnstate = 0;
gig_dbg(DEBUG_INIT, " setting up bcs[%d]->hw", channel);
- if (cs->ops->initbcshw(bcs))
- return bcs;
-
- gig_dbg(DEBUG_INIT, " failed");
- return NULL;
+ return cs->ops->initbcshw(bcs);
}
/**
@@ -752,7 +749,7 @@
cs->cmdbytes = 0;
gig_dbg(DEBUG_INIT, "setting up iif");
- if (!gigaset_isdn_regdev(cs, modulename)) {
+ if (gigaset_isdn_regdev(cs, modulename) < 0) {
pr_err("error registering ISDN device\n");
goto error;
}
@@ -760,7 +757,7 @@
make_valid(cs, VALID_ID);
++cs->cs_init;
gig_dbg(DEBUG_INIT, "setting up hw");
- if (!cs->ops->initcshw(cs))
+ if (cs->ops->initcshw(cs) < 0)
goto error;
++cs->cs_init;
@@ -774,7 +771,7 @@
/* set up channel data structures */
for (i = 0; i < channels; ++i) {
gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
- if (!gigaset_initbcs(cs->bcs + i, cs, i)) {
+ if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
pr_err("could not allocate channel %d data\n", i);
goto error;
}
@@ -869,7 +866,7 @@
for (i = 0; i < cs->channels; ++i) {
gigaset_freebcs(cs->bcs + i);
- if (!gigaset_initbcs(cs->bcs + i, cs, i))
+ if (gigaset_initbcs(cs->bcs + i, cs, i) < 0)
pr_err("could not allocate channel %d data\n", i);
}
@@ -890,14 +887,14 @@
* waiting for completion of the initialization.
*
* Return value:
- * 1 - success, 0 - error
+ * 0 on success, error code < 0 on failure
*/
int gigaset_start(struct cardstate *cs)
{
unsigned long flags;
if (mutex_lock_interruptible(&cs->mutex))
- return 0;
+ return -EBUSY;
spin_lock_irqsave(&cs->lock, flags);
cs->connected = 1;
@@ -921,11 +918,11 @@
wait_event(cs->waitqueue, !cs->waiting);
mutex_unlock(&cs->mutex);
- return 1;
+ return 0;
error:
mutex_unlock(&cs->mutex);
- return 0;
+ return -ENOMEM;
}
EXPORT_SYMBOL_GPL(gigaset_start);
@@ -937,7 +934,7 @@
* waiting for completion of the shutdown.
*
* Return value:
- * 0 - success, -1 - error (no device associated)
+ * 0 - success, -ENODEV - error (no device associated)
*/
int gigaset_shutdown(struct cardstate *cs)
{
@@ -945,7 +942,7 @@
if (!(cs->flags & VALID_MINOR)) {
mutex_unlock(&cs->mutex);
- return -1;
+ return -ENODEV;
}
cs->waiting = 1;