diff options
| -rw-r--r-- | drivers/isdn/gigaset/common.c | 61 |
1 files changed, 33 insertions, 28 deletions
diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c index 95eff3b2917a..4f75cce6fdff 100644 --- a/drivers/isdn/gigaset/common.c +++ b/drivers/isdn/gigaset/common.c @@ -356,16 +356,17 @@ static struct cardstate *alloc_cs(struct gigaset_driver *drv) { unsigned long flags; unsigned i; - static struct cardstate *ret = NULL; + struct cardstate *ret = NULL; spin_lock_irqsave(&drv->lock, flags); for (i = 0; i < drv->minors; ++i) { if (!(drv->flags[i] & VALID_MINOR)) { - drv->flags[i] = VALID_MINOR; - ret = drv->cs + i; - } - if (ret) + if (try_module_get(drv->owner)) { + drv->flags[i] = VALID_MINOR; + ret = drv->cs + i; + } break; + } } spin_unlock_irqrestore(&drv->lock, flags); return ret; @@ -376,6 +377,8 @@ static void free_cs(struct cardstate *cs) unsigned long flags; struct gigaset_driver *drv = cs->driver; spin_lock_irqsave(&drv->lock, flags); + if (drv->flags[cs->minor_index] & VALID_MINOR) + module_put(drv->owner); drv->flags[cs->minor_index] = 0; spin_unlock_irqrestore(&drv->lock, flags); } @@ -579,7 +582,7 @@ static struct bc_state *gigaset_initbcs(struct bc_state *bcs, } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL) skb_reserve(bcs->skb, HW_HDR_LEN); else { - warn("could not allocate skb\n"); + warn("could not allocate skb"); bcs->inputstate |= INS_skip_frame; } @@ -632,17 +635,25 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, int i; gig_dbg(DEBUG_INIT, "allocating cs"); - cs = alloc_cs(drv); - if (!cs) - goto error; + if (!(cs = alloc_cs(drv))) { + err("maximum number of devices exceeded"); + return NULL; + } + mutex_init(&cs->mutex); + mutex_lock(&cs->mutex); + gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1); cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL); - if (!cs->bcs) + if (!cs->bcs) { + err("out of memory"); goto error; + } gig_dbg(DEBUG_INIT, "allocating inbuf"); cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL); - if (!cs->inbuf) + if (!cs->inbuf) { + err("out of memory"); goto error; + } cs->cs_init = 0; cs->channels = channels; @@ -654,8 +665,6 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, spin_lock_init(&cs->ev_lock); cs->ev_tail = 0; cs->ev_head = 0; - mutex_init(&cs->mutex); - mutex_lock(&cs->mutex); tasklet_init(&cs->event_tasklet, &gigaset_handle_event, (unsigned long) cs); @@ -684,8 +693,10 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, for (i = 0; i < channels; ++i) { gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i); - if (!gigaset_initbcs(cs->bcs + i, cs, i)) + if (!gigaset_initbcs(cs->bcs + i, cs, i)) { + err("could not allocate channel %d data", i); goto error; + } } ++cs->cs_init; @@ -720,8 +731,10 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, 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)) { + err("could not allocate device specific data"); goto error; + } ++cs->cs_init; @@ -743,8 +756,8 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, mutex_unlock(&cs->mutex); return cs; -error: if (cs) - mutex_unlock(&cs->mutex); +error: + mutex_unlock(&cs->mutex); gig_dbg(DEBUG_INIT, "failed"); gigaset_freecs(cs); return NULL; @@ -1040,7 +1053,6 @@ void gigaset_freedriver(struct gigaset_driver *drv) spin_unlock_irqrestore(&driver_lock, flags); gigaset_if_freedriver(drv); - module_put(drv->owner); kfree(drv->cs); kfree(drv->flags); @@ -1072,10 +1084,6 @@ struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors, if (!drv) return NULL; - if (!try_module_get(owner)) - goto out1; - - drv->cs = NULL; drv->have_tty = 0; drv->minor = minor; drv->minors = minors; @@ -1087,11 +1095,11 @@ struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors, drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL); if (!drv->cs) - goto out2; + goto error; drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL); if (!drv->flags) - goto out3; + goto error; for (i = 0; i < minors; ++i) { drv->flags[i] = 0; @@ -1108,11 +1116,8 @@ struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors, return drv; -out3: +error: kfree(drv->cs); -out2: - module_put(owner); -out1: kfree(drv); return NULL; } |