kfifo: fix warn_unused_result

Fix the "ignoring return value of '...', declared with attribute
warn_unused_result" compiler warning in several users of the new kfifo
API.

It removes the __must_check attribute from kfifo_in() and
kfifo_in_locked() which must not necessary performed.

Fix the allocation bug in the nozomi driver file, by moving out the
kfifo_alloc from the interrupt handler into the probe function.

Fix the kfifo_out() and kfifo_out_locked() users to handle a unexpected
end of fifo.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefani Seibold 2009-12-21 14:37:29 -08:00 committed by Linus Torvalds
parent 7acd72eb85
commit 9842c38e91
7 changed files with 51 additions and 16 deletions

View File

@ -685,8 +685,6 @@ static int nozomi_read_config_table(struct nozomi *dc)
dump_table(dc);
for (i = PORT_MDM; i < MAX_PORT; i++) {
kfifo_alloc(&dc->port[i].fifo_ul,
FIFO_BUFFER_SIZE_UL, GFP_ATOMIC);
memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
}
@ -1433,6 +1431,16 @@ static int __devinit nozomi_card_init(struct pci_dev *pdev,
goto err_free_sbuf;
}
for (i = PORT_MDM; i < MAX_PORT; i++) {
if (kfifo_alloc(&dc->port[i].fifo_ul,
FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
dev_err(&pdev->dev,
"Could not allocate kfifo buffer\n");
ret = -ENOMEM;
goto err_free_kfifo;
}
}
spin_lock_init(&dc->spin_mutex);
nozomi_setup_private_data(dc);
@ -1445,7 +1453,7 @@ static int __devinit nozomi_card_init(struct pci_dev *pdev,
NOZOMI_NAME, dc);
if (unlikely(ret)) {
dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
goto err_free_sbuf;
goto err_free_kfifo;
}
DBG1("base_addr: %p", dc->base_addr);
@ -1464,13 +1472,28 @@ static int __devinit nozomi_card_init(struct pci_dev *pdev,
dc->state = NOZOMI_STATE_ENABLED;
for (i = 0; i < MAX_PORT; i++) {
struct device *tty_dev;
mutex_init(&dc->port[i].tty_sem);
tty_port_init(&dc->port[i].port);
tty_register_device(ntty_driver, dc->index_start + i,
tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
&pdev->dev);
if (IS_ERR(tty_dev)) {
ret = PTR_ERR(tty_dev);
dev_err(&pdev->dev, "Could not allocate tty?\n");
goto err_free_tty;
}
}
return 0;
err_free_tty:
for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
tty_unregister_device(ntty_driver, i);
err_free_kfifo:
for (i = 0; i < MAX_PORT; i++)
kfifo_free(&dc->port[i].fifo_ul);
err_free_sbuf:
kfree(dc->send_buf);
iounmap(dc->base_addr);

View File

@ -86,8 +86,9 @@ static int __cxio_init_resource_fifo(struct kfifo *fifo,
kfifo_in(fifo, (unsigned char *) &i, sizeof(u32));
for (i = 0; i < skip_low + skip_high; i++)
kfifo_out_locked(fifo, (unsigned char *) &entry,
sizeof(u32), fifo_lock);
if (kfifo_out_locked(fifo, (unsigned char *) &entry,
sizeof(u32), fifo_lock) != sizeof(u32))
break;
return 0;
}

View File

@ -968,8 +968,9 @@ static int meyeioc_sync(struct file *file, void *fh, int *i)
/* fall through */
case MEYE_BUF_DONE:
meye.grab_buffer[*i].state = MEYE_BUF_UNUSED;
kfifo_out_locked(&meye.doneq, (unsigned char *)&unused,
sizeof(int), &meye.doneq_lock);
if (kfifo_out_locked(&meye.doneq, (unsigned char *)&unused,
sizeof(int), &meye.doneq_lock) != sizeof(int))
break;
}
*i = meye.grab_buffer[*i].size;
mutex_unlock(&meye.lock);

View File

@ -514,8 +514,10 @@ static int lbs_thread(void *data)
while (kfifo_len(&priv->event_fifo)) {
u32 event;
kfifo_out(&priv->event_fifo, (unsigned char *) &event,
sizeof(event));
if (kfifo_out(&priv->event_fifo,
(unsigned char *) &event, sizeof(event)) !=
sizeof(event))
break;
spin_unlock_irq(&priv->driver_lock);
lbs_process_event(priv, event);
spin_lock_irq(&priv->driver_lock);

View File

@ -990,8 +990,13 @@ static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task)
}
if (r2t == NULL) {
kfifo_out(&tcp_task->r2tqueue,
(void *)&tcp_task->r2t, sizeof(void *));
if (kfifo_out(&tcp_task->r2tqueue,
(void *)&tcp_task->r2t, sizeof(void *)) !=
sizeof(void *)) {
WARN_ONCE(1, "unexpected fifo state");
r2t = NULL;
}
r2t = tcp_task->r2t;
}
spin_unlock_bh(&session->lock);

View File

@ -163,8 +163,11 @@ struct iu_entry *srp_iu_get(struct srp_target *target)
{
struct iu_entry *iue = NULL;
kfifo_out_locked(&target->iu_queue.queue, (void *) &iue,
sizeof(void *), &target->iu_queue.lock);
if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue,
sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) {
WARN_ONCE(1, "unexpected fifo state");
return NULL;
}
if (!iue)
return iue;
iue->target = target;

View File

@ -56,7 +56,7 @@ extern void kfifo_init(struct kfifo *fifo, unsigned char *buffer,
extern __must_check int kfifo_alloc(struct kfifo *fifo, unsigned int size,
gfp_t gfp_mask);
extern void kfifo_free(struct kfifo *fifo);
extern __must_check unsigned int kfifo_in(struct kfifo *fifo,
extern unsigned int kfifo_in(struct kfifo *fifo,
const unsigned char *from, unsigned int len);
extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
unsigned char *to, unsigned int len);
@ -94,7 +94,7 @@ static inline unsigned int kfifo_len(struct kfifo *fifo)
* the FIFO depending on the free space, and returns the number of
* bytes copied.
*/
static inline __must_check unsigned int kfifo_in_locked(struct kfifo *fifo,
static inline unsigned int kfifo_in_locked(struct kfifo *fifo,
const unsigned char *from, unsigned int n, spinlock_t *lock)
{
unsigned long flags;