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kfifo: move out spinlock

Browse source 
Move the pointer to the spinlock out of struct kfifo.  Most users in
tree do not actually use a spinlock, so the few exceptions now have to
call kfifo_{get,put}_locked, which takes an extra argument to a
spinlock.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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 14:37:27 -08:00 committed by Linus Torvalds
parent 4546548789
commit c1e13f2567
16 changed files with 132 additions and 131 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/char/nozomi.c
View file

@ -686,7 +686,7 @@ static int nozomi_read_config_table(struct nozomi *dc)
for (i = PORT_MDM; i < MAX_PORT; i++) {
kfifo_alloc(&dc->port[i].fifo_ul,
FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
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));
}

21
drivers/char/sonypi.c
View file

@ -777,8 +777,9 @@ static void input_keyrelease(struct work_struct *work)
{
struct sonypi_keypress kp;
while (kfifo_get(&sonypi_device.input_fifo, (unsigned char *)&kp,
sizeof(kp)) == sizeof(kp)) {
while (kfifo_get_locked(&sonypi_device.input_fifo, (unsigned char *)&kp,
sizeof(kp), &sonypi_device.input_fifo_lock)
== sizeof(kp)) {
msleep(10);
input_report_key(kp.dev, kp.key, 0);
input_sync(kp.dev);
@ -827,8 +828,9 @@ static void sonypi_report_input_event(u8 event)
if (kp.dev) {
input_report_key(kp.dev, kp.key, 1);
input_sync(kp.dev);
kfifo_put(&sonypi_device.input_fifo,
(unsigned char *)&kp, sizeof(kp));
kfifo_put_locked(&sonypi_device.input_fifo,
(unsigned char *)&kp, sizeof(kp),
&sonypi_device.input_fifo_lock);
schedule_work(&sonypi_device.input_work);
}
}
@ -880,7 +882,8 @@ found:
acpi_bus_generate_proc_event(sonypi_acpi_device, 1, event);
#endif
kfifo_put(&sonypi_device.fifo, (unsigned char *)&event, sizeof(event));
kfifo_put_locked(&sonypi_device.fifo, (unsigned char *)&event,
sizeof(event), &sonypi_device.fifo_lock);
kill_fasync(&sonypi_device.fifo_async, SIGIO, POLL_IN);
wake_up_interruptible(&sonypi_device.fifo_proc_list);
@ -929,7 +932,8 @@ static ssize_t sonypi_misc_read(struct file *file, char __user *buf,
return ret;
while (ret < count &&
(kfifo_get(&sonypi_device.fifo, &c, sizeof(c)) == sizeof(c))) {
(kfifo_get_locked(&sonypi_device.fifo, &c, sizeof(c),
&sonypi_device.fifo_lock) == sizeof(c))) {
if (put_user(c, buf++))
return -EFAULT;
ret++;
@ -1313,8 +1317,7 @@ static int __devinit sonypi_probe(struct platform_device *dev)
"http://www.linux.it/~malattia/wiki/index.php/Sony_drivers\n");
spin_lock_init(&sonypi_device.fifo_lock);
error = kfifo_alloc(&sonypi_device.fifo, SONYPI_BUF_SIZE, GFP_KERNEL,
&sonypi_device.fifo_lock);
error = kfifo_alloc(&sonypi_device.fifo, SONYPI_BUF_SIZE, GFP_KERNEL);
if (error) {
printk(KERN_ERR "sonypi: kfifo_alloc failed\n");
return error;
@ -1394,7 +1397,7 @@ static int __devinit sonypi_probe(struct platform_device *dev)
spin_lock_init(&sonypi_device.input_fifo_lock);
error = kfifo_alloc(&sonypi_device.input_fifo, SONYPI_BUF_SIZE,
GFP_KERNEL, &sonypi_device.input_fifo_lock);
GFP_KERNEL);
if (error) {
printk(KERN_ERR "sonypi: kfifo_alloc failed\n");
goto err_inpdev_unregister;

36
drivers/infiniband/hw/cxgb3/cxio_resource.c
View file

@ -55,7 +55,7 @@ static int __cxio_init_resource_fifo(struct kfifo *fifo,
u32 rarray[16];
spin_lock_init(fifo_lock);
if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL, fifo_lock))
if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL))
return -ENOMEM;
for (i = 0; i < skip_low + skip_high; i++)
@ -86,7 +86,8 @@ static int __cxio_init_resource_fifo(struct kfifo *fifo,
__kfifo_put(fifo, (unsigned char *) &i, sizeof(u32));
for (i = 0; i < skip_low + skip_high; i++)
kfifo_get(fifo, (unsigned char *) &entry, sizeof(u32));
kfifo_get_locked(fifo, (unsigned char *) &entry,
sizeof(u32), fifo_lock);
return 0;
}
@ -113,8 +114,7 @@ static int cxio_init_qpid_fifo(struct cxio_rdev *rdev_p)
spin_lock_init(&rdev_p->rscp->qpid_fifo_lock);
if (kfifo_alloc(&rdev_p->rscp->qpid_fifo, T3_MAX_NUM_QP * sizeof(u32),
GFP_KERNEL,
&rdev_p->rscp->qpid_fifo_lock))
GFP_KERNEL))
return -ENOMEM;
for (i = 16; i < T3_MAX_NUM_QP; i++)
@ -177,33 +177,37 @@ tpt_err:
/*
* returns 0 if no resource available
*/
static u32 cxio_hal_get_resource(struct kfifo *fifo)
static u32 cxio_hal_get_resource(struct kfifo *fifo, spinlock_t * lock)
{
u32 entry;
if (kfifo_get(fifo, (unsigned char *) &entry, sizeof(u32)))
if (kfifo_get_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock))
return entry;
else
return 0; /* fifo emptry */
}
static void cxio_hal_put_resource(struct kfifo *fifo, u32 entry)
static void cxio_hal_put_resource(struct kfifo *fifo, spinlock_t * lock,
u32 entry)
{
BUG_ON(kfifo_put(fifo, (unsigned char *) &entry, sizeof(u32)) == 0);
BUG_ON(
kfifo_put_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock)
== 0);
}
u32 cxio_hal_get_stag(struct cxio_hal_resource *rscp)
{
return cxio_hal_get_resource(&rscp->tpt_fifo);
return cxio_hal_get_resource(&rscp->tpt_fifo, &rscp->tpt_fifo_lock);
}
void cxio_hal_put_stag(struct cxio_hal_resource *rscp, u32 stag)
{
cxio_hal_put_resource(&rscp->tpt_fifo, stag);
cxio_hal_put_resource(&rscp->tpt_fifo, &rscp->tpt_fifo_lock, stag);
}
u32 cxio_hal_get_qpid(struct cxio_hal_resource *rscp)
{
u32 qpid = cxio_hal_get_resource(&rscp->qpid_fifo);
u32 qpid = cxio_hal_get_resource(&rscp->qpid_fifo,
&rscp->qpid_fifo_lock);
PDBG("%s qpid 0x%x\n", __func__, qpid);
return qpid;
}
@ -211,27 +215,27 @@ u32 cxio_hal_get_qpid(struct cxio_hal_resource *rscp)
void cxio_hal_put_qpid(struct cxio_hal_resource *rscp, u32 qpid)
{
PDBG("%s qpid 0x%x\n", __func__, qpid);
cxio_hal_put_resource(&rscp->qpid_fifo, qpid);
cxio_hal_put_resource(&rscp->qpid_fifo, &rscp->qpid_fifo_lock, qpid);
}
u32 cxio_hal_get_cqid(struct cxio_hal_resource *rscp)
{
return cxio_hal_get_resource(&rscp->cqid_fifo);
return cxio_hal_get_resource(&rscp->cqid_fifo, &rscp->cqid_fifo_lock);
}
void cxio_hal_put_cqid(struct cxio_hal_resource *rscp, u32 cqid)
{
cxio_hal_put_resource(&rscp->cqid_fifo, cqid);
cxio_hal_put_resource(&rscp->cqid_fifo, &rscp->cqid_fifo_lock, cqid);
}
u32 cxio_hal_get_pdid(struct cxio_hal_resource *rscp)
{
return cxio_hal_get_resource(&rscp->pdid_fifo);
return cxio_hal_get_resource(&rscp->pdid_fifo, &rscp->pdid_fifo_lock);
}
void cxio_hal_put_pdid(struct cxio_hal_resource *rscp, u32 pdid)
{
cxio_hal_put_resource(&rscp->pdid_fifo, pdid);
cxio_hal_put_resource(&rscp->pdid_fifo, &rscp->pdid_fifo_lock, pdid);
}
void cxio_hal_destroy_resource(struct cxio_hal_resource *rscp)

35
drivers/media/video/meye.c
View file

@ -800,8 +800,8 @@ again:
return IRQ_HANDLED;
if (meye.mchip_mode == MCHIP_HIC_MODE_CONT_OUT) {
if (kfifo_get(&meye.grabq, (unsigned char *)&reqnr,
sizeof(int)) != sizeof(int)) {
if (kfifo_get_locked(&meye.grabq, (unsigned char *)&reqnr,
sizeof(int), &meye.grabq_lock) != sizeof(int)) {
mchip_free_frame();
return IRQ_HANDLED;
}
@ -811,7 +811,8 @@ again:
meye.grab_buffer[reqnr].state = MEYE_BUF_DONE;
do_gettimeofday(&meye.grab_buffer[reqnr].timestamp);
meye.grab_buffer[reqnr].sequence = sequence++;
kfifo_put(&meye.doneq, (unsigned char *)&reqnr, sizeof(int));
kfifo_put_locked(&meye.doneq, (unsigned char *)&reqnr,
sizeof(int), &meye.doneq_lock);
wake_up_interruptible(&meye.proc_list);
} else {
int size;
@ -820,8 +821,8 @@ again:
mchip_free_frame();
goto again;
}
if (kfifo_get(&meye.grabq, (unsigned char *)&reqnr,
sizeof(int)) != sizeof(int)) {
if (kfifo_get_locked(&meye.grabq, (unsigned char *)&reqnr,
sizeof(int), &meye.grabq_lock) != sizeof(int)) {
mchip_free_frame();
goto again;
}
@ -831,7 +832,8 @@ again:
meye.grab_buffer[reqnr].state = MEYE_BUF_DONE;
do_gettimeofday(&meye.grab_buffer[reqnr].timestamp);
meye.grab_buffer[reqnr].sequence = sequence++;
kfifo_put(&meye.doneq, (unsigned char *)&reqnr, sizeof(int));
kfifo_put_locked(&meye.doneq, (unsigned char *)&reqnr,
sizeof(int), &meye.doneq_lock);
wake_up_interruptible(&meye.proc_list);
}
mchip_free_frame();
@ -933,7 +935,8 @@ static int meyeioc_qbuf_capt(int *nb)
mchip_cont_compression_start();
meye.grab_buffer[*nb].state = MEYE_BUF_USING;
kfifo_put(&meye.grabq, (unsigned char *)nb, sizeof(int));
kfifo_put_locked(&meye.grabq, (unsigned char *)nb, sizeof(int),
&meye.grabq_lock);
mutex_unlock(&meye.lock);
return 0;
@ -965,7 +968,8 @@ 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_get(&meye.doneq, (unsigned char *)&unused, sizeof(int));
kfifo_get_locked(&meye.doneq, (unsigned char *)&unused,
sizeof(int), &meye.doneq_lock);
}
*i = meye.grab_buffer[*i].size;
mutex_unlock(&meye.lock);
@ -1452,7 +1456,8 @@ static int vidioc_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
buf->flags |= V4L2_BUF_FLAG_QUEUED;
buf->flags &= ~V4L2_BUF_FLAG_DONE;
meye.grab_buffer[buf->index].state = MEYE_BUF_USING;
kfifo_put(&meye.grabq, (unsigned char *)&buf->index, sizeof(int));
kfifo_put_locked(&meye.grabq, (unsigned char *)&buf->index,
sizeof(int), &meye.grabq_lock);
mutex_unlock(&meye.lock);
return 0;
@ -1478,8 +1483,8 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
return -EINTR;
}
if (!kfifo_get(&meye.doneq, (unsigned char *)&reqnr,
sizeof(int))) {
if (!kfifo_get_locked(&meye.doneq, (unsigned char *)&reqnr,
sizeof(int), &meye.doneq_lock)) {
mutex_unlock(&meye.lock);
return -EBUSY;
}
@ -1745,14 +1750,14 @@ static int __devinit meye_probe(struct pci_dev *pcidev,
}
spin_lock_init(&meye.grabq_lock);
if (kfifo_alloc(&meye.grabq, sizeof(int) * MEYE_MAX_BUFNBRS, GFP_KERNEL,
&meye.grabq_lock)) {
if (kfifo_alloc(&meye.grabq, sizeof(int) * MEYE_MAX_BUFNBRS,
GFP_KERNEL)) {
printk(KERN_ERR "meye: fifo allocation failed\n");
goto outkfifoalloc1;
}
spin_lock_init(&meye.doneq_lock);
if (kfifo_alloc(&meye.doneq, sizeof(int) * MEYE_MAX_BUFNBRS, GFP_KERNEL,
&meye.doneq_lock)) {
if (kfifo_alloc(&meye.doneq, sizeof(int) * MEYE_MAX_BUFNBRS,
GFP_KERNEL)) {
printk(KERN_ERR "meye: fifo allocation failed\n");
goto outkfifoalloc2;
}

2
drivers/net/wireless/libertas/main.c
View file

@ -883,7 +883,7 @@ static int lbs_init_adapter(struct lbs_private *priv)
priv->resp_len[0] = priv->resp_len[1] = 0;
/* Create the event FIFO */
ret = kfifo_alloc(&priv->event_fifo, sizeof(u32) * 16, GFP_KERNEL, NULL);
ret = kfifo_alloc(&priv->event_fifo, sizeof(u32) * 16, GFP_KERNEL);
if (ret) {
lbs_pr_err("Out of memory allocating event FIFO buffer\n");
goto out;

18
drivers/platform/x86/fujitsu-laptop.c
View file

@ -825,7 +825,7 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
/* kfifo */
spin_lock_init(&fujitsu_hotkey->fifo_lock);
error = kfifo_alloc(&fujitsu_hotkey->fifo, RINGBUFFERSIZE * sizeof(int),
GFP_KERNEL, &fujitsu_hotkey->fifo_lock);
GFP_KERNEL);
if (error) {
printk(KERN_ERR "kfifo_alloc failed\n");
goto err_stop;
@ -1006,9 +1006,10 @@ static void acpi_fujitsu_hotkey_notify(struct acpi_device *device, u32 event)
vdbg_printk(FUJLAPTOP_DBG_TRACE,
"Push keycode into ringbuffer [%d]\n",
keycode);
status = kfifo_put(&fujitsu_hotkey->fifo,
status = kfifo_put_locked(&fujitsu_hotkey->fifo,
(unsigned char *)&keycode,
sizeof(keycode));
sizeof(keycode),
&fujitsu_hotkey->fifo_lock);
if (status != sizeof(keycode)) {
vdbg_printk(FUJLAPTOP_DBG_WARN,
"Could not push keycode [0x%x]\n",
@ -1019,11 +1020,12 @@ static void acpi_fujitsu_hotkey_notify(struct acpi_device *device, u32 event)
}
} else if (keycode == 0) {
while ((status =
kfifo_get
(&fujitsu_hotkey->fifo, (unsigned char *)
&keycode_r,
sizeof
(keycode_r))) == sizeof(keycode_r)) {
kfifo_get_locked(
&fujitsu_hotkey->fifo,
(unsigned char *) &keycode_r,
sizeof(keycode_r),
&fujitsu_hotkey->fifo_lock))
== sizeof(keycode_r)) {
input_report_key(input, keycode_r, 0);
input_sync(input);
vdbg_printk(FUJLAPTOP_DBG_TRACE,

22
drivers/platform/x86/sony-laptop.c
View file

@ -300,8 +300,9 @@ static void do_sony_laptop_release_key(struct work_struct *work)
{
struct sony_laptop_keypress kp;
while (kfifo_get(&sony_laptop_input.fifo, (unsigned char *)&kp,
sizeof(kp)) == sizeof(kp)) {
while (kfifo_get_locked(&sony_laptop_input.fifo, (unsigned char *)&kp,
sizeof(kp), &sony_laptop_input.fifo_lock)
== sizeof(kp)) {
msleep(10);
input_report_key(kp.dev, kp.key, 0);
input_sync(kp.dev);
@ -362,8 +363,9 @@ static void sony_laptop_report_input_event(u8 event)
/* we emit the scancode so we can always remap the key */
input_event(kp.dev, EV_MSC, MSC_SCAN, event);
input_sync(kp.dev);
kfifo_put(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp));
kfifo_put_locked(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp),
&sony_laptop_input.fifo_lock);
if (!work_pending(&sony_laptop_release_key_work))
queue_work(sony_laptop_input.wq,
@ -386,8 +388,7 @@ static int sony_laptop_setup_input(struct acpi_device *acpi_device)
/* kfifo */
spin_lock_init(&sony_laptop_input.fifo_lock);
error =
kfifo_alloc(&sony_laptop_input.fifo, SONY_LAPTOP_BUF_SIZE, GFP_KERNEL,
&sony_laptop_input.fifo_lock);
kfifo_alloc(&sony_laptop_input.fifo, SONY_LAPTOP_BUF_SIZE, GFP_KERNEL);
if (error) {
printk(KERN_ERR DRV_PFX "kfifo_alloc failed\n");
goto err_dec_users;
@ -2129,7 +2130,8 @@ static ssize_t sonypi_misc_read(struct file *file, char __user *buf,
return ret;
while (ret < count &&
(kfifo_get(&sonypi_compat.fifo, &c, sizeof(c)) == sizeof(c))) {
(kfifo_get_locked(&sonypi_compat.fifo, &c, sizeof(c),
&sonypi_compat.fifo_lock) == sizeof(c))) {
if (put_user(c, buf++))
return -EFAULT;
ret++;
@ -2308,7 +2310,8 @@ static struct miscdevice sonypi_misc_device = {
static void sonypi_compat_report_event(u8 event)
{
kfifo_put(&sonypi_compat.fifo, (unsigned char *)&event, sizeof(event));
kfifo_put_locked(&sonypi_compat.fifo, (unsigned char *)&event,
sizeof(event), &sonypi_compat.fifo_lock);
kill_fasync(&sonypi_compat.fifo_async, SIGIO, POLL_IN);
wake_up_interruptible(&sonypi_compat.fifo_proc_list);
}
@ -2319,8 +2322,7 @@ static int sonypi_compat_init(void)
spin_lock_init(&sonypi_compat.fifo_lock);
error =
kfifo_alloc(&sonypi_compat.fifo, SONY_LAPTOP_BUF_SIZE, GFP_KERNEL,
&sonypi_compat.fifo_lock);
kfifo_alloc(&sonypi_compat.fifo, SONY_LAPTOP_BUF_SIZE, GFP_KERNEL);
if (error) {
printk(KERN_ERR DRV_PFX "kfifo_alloc failed\n");
return error;

2
drivers/scsi/libiscsi.c
View file

@ -2461,7 +2461,7 @@ iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
if (q->pool == NULL)
return -ENOMEM;
kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*), NULL);
kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
for (i = 0; i < max; i++) {
q->pool[i] = kzalloc(item_size, GFP_KERNEL);

2
drivers/scsi/libiscsi_tcp.c
View file

@ -1128,7 +1128,7 @@ int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session)
/* R2T xmit queue */
if (kfifo_alloc(&tcp_task->r2tqueue,
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL)) {
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) {
iscsi_pool_free(&tcp_task->r2tpool);
goto r2t_alloc_fail;
}

9
drivers/scsi/libsrp.c
View file

@ -58,8 +58,7 @@ static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
goto free_pool;
spin_lock_init(&q->lock);
kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *),
&q->lock);
kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *));
for (i = 0, iue = q->items; i < max; i++) {
__kfifo_put(&q->queue, (void *) &iue, sizeof(void *));
@ -164,7 +163,8 @@ struct iu_entry *srp_iu_get(struct srp_target *target)
{
struct iu_entry *iue = NULL;
kfifo_get(&target->iu_queue.queue, (void *) &iue, sizeof(void *));
kfifo_get_locked(&target->iu_queue.queue, (void *) &iue,
sizeof(void *), &target->iu_queue.lock);
if (!iue)
return iue;
iue->target = target;
@ -176,7 +176,8 @@ EXPORT_SYMBOL_GPL(srp_iu_get);
void srp_iu_put(struct iu_entry *iue)
{
kfifo_put(&iue->target->iu_queue.queue, (void *) &iue, sizeof(void *));
kfifo_put_locked(&iue->target->iu_queue.queue, (void *) &iue,
sizeof(void *), &iue->target->iu_queue.lock);
}
EXPORT_SYMBOL_GPL(srp_iu_put);

2
drivers/usb/host/fhci.h
View file

@ -495,7 +495,7 @@ static inline struct usb_hcd *fhci_to_hcd(struct fhci_hcd *fhci)
/* fifo of pointers */
static inline int cq_new(struct kfifo *fifo, int size)
{
return kfifo_alloc(fifo, size * sizeof(void *), GFP_KERNEL, NULL);
return kfifo_alloc(fifo, size * sizeof(void *), GFP_KERNEL);
}
static inline void cq_delete(struct kfifo *kfifo)

4
drivers/usb/serial/generic.c
View file

@ -285,7 +285,7 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port)
return 0;
data = port->write_urb->transfer_buffer;
count = kfifo_get(port->write_fifo, data, port->bulk_out_size);
count = kfifo_get_locked(port->write_fifo, data, port->bulk_out_size, &port->lock);
usb_serial_debug_data(debug, &port->dev, __func__, count, data);
/* set up our urb */
@ -345,7 +345,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
return usb_serial_multi_urb_write(tty, port,
buf, count);
count = kfifo_put(port->write_fifo, buf, count);
count = kfifo_put_locked(port->write_fifo, buf, count, &port->lock);
result = usb_serial_generic_write_start(port);
if (result >= 0)

3
drivers/usb/serial/usb-serial.c
View file

@ -939,8 +939,7 @@ int usb_serial_probe(struct usb_interface *interface,
dev_err(&interface->dev, "No free urbs available\n");
goto probe_error;
}
if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL,
&port->lock))
if (kfifo_alloc(port->write_fifo, PAGE_SIZE, GFP_KERNEL))
goto probe_error;
buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
port->bulk_out_size = buffer_size;

82
include/linux/kfifo.h
View file

@ -30,13 +30,12 @@ struct kfifo {
unsigned int size; /* the size of the allocated buffer */
unsigned int in; /* data is added at offset (in % size) */
unsigned int out; /* data is extracted from off. (out % size) */
spinlock_t *lock; /* protects concurrent modifications */
};
extern void kfifo_init(struct kfifo *fifo, unsigned char *buffer,
unsigned int size, spinlock_t *lock);
unsigned int size);
extern __must_check int kfifo_alloc(struct kfifo *fifo, unsigned int size,
gfp_t gfp_mask, spinlock_t *lock);
gfp_t gfp_mask);
extern void kfifo_free(struct kfifo *fifo);
extern unsigned int __kfifo_put(struct kfifo *fifo,
const unsigned char *buffer, unsigned int len);
@ -58,58 +57,67 @@ static inline void __kfifo_reset(struct kfifo *fifo)
*/
static inline void kfifo_reset(struct kfifo *fifo)
{
unsigned long flags;
spin_lock_irqsave(fifo->lock, flags);
__kfifo_reset(fifo);
spin_unlock_irqrestore(fifo->lock, flags);
}
/**
* kfifo_put - puts some data into the FIFO
* __kfifo_len - returns the number of bytes available in the FIFO
* @fifo: the fifo to be used.
* @buffer: the data to be added.
* @len: the length of the data to be added.
*/
static inline unsigned int __kfifo_len(struct kfifo *fifo)
{
register unsigned int out;
out = fifo->out;
smp_rmb();
return fifo->in - out;
}
/**
* kfifo_put_locked - puts some data into the FIFO using a spinlock for locking
* @fifo: the fifo to be used.
* @from: the data to be added.
* @n: the length of the data to be added.
* @lock: pointer to the spinlock to use for locking.
*
* This function copies at most @len bytes from the @buffer into
* This function copies at most @len bytes from the @from buffer into
* the FIFO depending on the free space, and returns the number of
* bytes copied.
*/
static inline unsigned int kfifo_put(struct kfifo *fifo,
const unsigned char *buffer, unsigned int len)
static inline __must_check unsigned int kfifo_put_locked(struct kfifo *fifo,
const unsigned char *from, unsigned int n, spinlock_t *lock)
{
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(fifo->lock, flags);
spin_lock_irqsave(lock, flags);
ret = __kfifo_put(fifo, buffer, len);
ret = __kfifo_put(fifo, from, n);
spin_unlock_irqrestore(fifo->lock, flags);
spin_unlock_irqrestore(lock, flags);
return ret;
}
/**
* kfifo_get - gets some data from the FIFO
* kfifo_get_locked - gets some data from the FIFO using a spinlock for locking
* @fifo: the fifo to be used.
* @buffer: where the data must be copied.
* @len: the size of the destination buffer.
* @to: where the data must be copied.
* @n: the size of the destination buffer.
* @lock: pointer to the spinlock to use for locking.
*
* This function copies at most @len bytes from the FIFO into the
* @buffer and returns the number of copied bytes.
* @to buffer and returns the number of copied bytes.
*/
static inline unsigned int kfifo_get(struct kfifo *fifo,
unsigned char *buffer, unsigned int len)
static inline __must_check unsigned int kfifo_get_locked(struct kfifo *fifo,
unsigned char *to, unsigned int n, spinlock_t *lock)
{
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(fifo->lock, flags);
spin_lock_irqsave(lock, flags);
ret = __kfifo_get(fifo, buffer, len);
ret = __kfifo_get(fifo, to, n);
/*
* optimization: if the FIFO is empty, set the indices to 0
@ -118,36 +126,18 @@ static inline unsigned int kfifo_get(struct kfifo *fifo,
if (fifo->in == fifo->out)
fifo->in = fifo->out = 0;
spin_unlock_irqrestore(fifo->lock, flags);
spin_unlock_irqrestore(lock, flags);
return ret;
}
/**
* __kfifo_len - returns the number of bytes available in the FIFO, no locking version
* @fifo: the fifo to be used.
*/
static inline unsigned int __kfifo_len(struct kfifo *fifo)
{
return fifo->in - fifo->out;
}
/**
* kfifo_len - returns the number of bytes available in the FIFO
* @fifo: the fifo to be used.
*/
static inline unsigned int kfifo_len(struct kfifo *fifo)
{
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(fifo->lock, flags);
ret = __kfifo_len(fifo);
spin_unlock_irqrestore(fifo->lock, flags);
return ret;
return __kfifo_len(fifo);
}
#endif

17
kernel/kfifo.c
View file

@ -28,11 +28,10 @@
#include <linux/log2.h>
static void _kfifo_init(struct kfifo *fifo, unsigned char *buffer,
unsigned int size, spinlock_t *lock)
unsigned int size)
{
fifo->buffer = buffer;
fifo->size = size;
fifo->lock = lock;
kfifo_reset(fifo);
}
@ -42,16 +41,14 @@ static void _kfifo_init(struct kfifo *fifo, unsigned char *buffer,
* @fifo: the fifo to assign the buffer
* @buffer: the preallocated buffer to be used.
* @size: the size of the internal buffer, this have to be a power of 2.
* @lock: the lock to be used to protect the fifo buffer
*
*/
void kfifo_init(struct kfifo *fifo, unsigned char *buffer, unsigned int size,
spinlock_t *lock)
void kfifo_init(struct kfifo *fifo, unsigned char *buffer, unsigned int size)
{
/* size must be a power of 2 */
BUG_ON(!is_power_of_2(size));
_kfifo_init(fifo, buffer, size, lock);
_kfifo_init(fifo, buffer, size);
}
EXPORT_SYMBOL(kfifo_init);
@ -60,7 +57,6 @@ EXPORT_SYMBOL(kfifo_init);
* @fifo: the fifo to assign then new buffer
* @size: the size of the buffer to be allocated, this have to be a power of 2.
* @gfp_mask: get_free_pages mask, passed to kmalloc()
* @lock: the lock to be used to protect the fifo buffer
*
* This function dynamically allocates a new fifo internal buffer
*
@ -68,8 +64,7 @@ EXPORT_SYMBOL(kfifo_init);
* The buffer will be release with kfifo_free().
* Return 0 if no error, otherwise the an error code
*/
int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask,
spinlock_t *lock)
int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask)
{
unsigned char *buffer;
@ -84,11 +79,11 @@ int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask,
buffer = kmalloc(size, gfp_mask);
if (!buffer) {
_kfifo_init(fifo, 0, 0, NULL);
_kfifo_init(fifo, 0, 0);
return -ENOMEM;
}
_kfifo_init(fifo, buffer, size, lock);
_kfifo_init(fifo, buffer, size);
return 0;
}

6
net/dccp/probe.c
View file

@ -67,7 +67,7 @@ static void printl(const char *fmt, ...)
len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
va_end(args);
kfifo_put(&dccpw.fifo, tbuf, len);
kfifo_put_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
wake_up(&dccpw.wait);
}
@ -135,7 +135,7 @@ static ssize_t dccpprobe_read(struct file *file, char __user *buf,
if (error)
goto out_free;
cnt = kfifo_get(&dccpw.fifo, tbuf, len);
cnt = kfifo_get_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
out_free:
@ -156,7 +156,7 @@ static __init int dccpprobe_init(void)
init_waitqueue_head(&dccpw.wait);
spin_lock_init(&dccpw.lock);
if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL, &dccpw.lock))
if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
return ret;
if (!proc_net_fops_create(&init_net, procname, S_IRUSR, &dccpprobe_fops))
goto err0;