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authorStefani Seibold <stefani@seibold.net>2009-12-22 01:37:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-23 01:17:55 +0300
commit45465487897a1c6d508b14b904dc5777f7ec7e04 (patch)
tree935c8dae68dc793ff2f795d57cf027531475cd53 /drivers/usb
parent2ec91eec47f713e3d158ba5b28a24a85a2cf3650 (diff)
downloadlinux-45465487897a1c6d508b14b904dc5777f7ec7e04.tar.xz
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation. The current kernel fifo API is not very widely used, because it has to many constrains. Only 17 files in the current 2.6.31-rc5 used it. FIFO's are like list's a very basic thing and a kfifo API which handles the most use case would save a lot of development time and memory resources. I think this are the reasons why kfifo is not in use: - The API is to simple, important functions are missing - A fifo can be only allocated dynamically - There is a requirement of a spinlock whether you need it or not - There is no support for data records inside a fifo So I decided to extend the kfifo in a more generic way without blowing up the API to much. The new API has the following benefits: - Generic usage: For kernel internal use and/or device driver. - Provide an API for the most use case. - Slim API: The whole API provides 25 functions. - Linux style habit. - DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros - Direct copy_to_user from the fifo and copy_from_user into the fifo. - The kfifo itself is an in place member of the using data structure, this save an indirection access and does not waste the kernel allocator. - Lockless access: if only one reader and one writer is active on the fifo, which is the common use case, no additional locking is necessary. - Remove spinlock - give the user the freedom of choice what kind of locking to use if one is required. - Ability to handle records. Three type of records are supported: - Variable length records between 0-255 bytes, with a record size field of 1 bytes. - Variable length records between 0-65535 bytes, with a record size field of 2 bytes. - Fixed size records, which no record size field. - Preserve memory resource. - Performance! - Easy to use! This patch: Since most users want to have the kfifo as part of another object, reorganize the code to allow including struct kfifo in another data structure. This requires changing the kfifo_alloc and kfifo_init prototypes so that we pass an existing kfifo pointer into them. This patch changes the implementation and all existing users. [akpm@linux-foundation.org: fix warning] 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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/fhci-sched.c10
-rw-r--r--drivers/usb/host/fhci-tds.c35
-rw-r--r--drivers/usb/host/fhci.h10
-rw-r--r--drivers/usb/serial/usb-serial.c5
4 files changed, 29 insertions, 31 deletions
diff --git a/drivers/usb/host/fhci-sched.c b/drivers/usb/host/fhci-sched.c
index 00a29855d0c4..ff43747a614f 100644
--- a/drivers/usb/host/fhci-sched.c
+++ b/drivers/usb/host/fhci-sched.c
@@ -37,7 +37,7 @@ static void recycle_frame(struct fhci_usb *usb, struct packet *pkt)
pkt->info = 0;
pkt->priv_data = NULL;
- cq_put(usb->ep0->empty_frame_Q, pkt);
+ cq_put(&usb->ep0->empty_frame_Q, pkt);
}
/* confirm submitted packet */
@@ -57,7 +57,7 @@ void fhci_transaction_confirm(struct fhci_usb *usb, struct packet *pkt)
if ((td->data + td->actual_len) && trans_len)
memcpy(td->data + td->actual_len, pkt->data,
trans_len);
- cq_put(usb->ep0->dummy_packets_Q, pkt->data);
+ cq_put(&usb->ep0->dummy_packets_Q, pkt->data);
}
recycle_frame(usb, pkt);
@@ -213,7 +213,7 @@ static int add_packet(struct fhci_usb *usb, struct ed *ed, struct td *td)
}
/* update frame object fields before transmitting */
- pkt = cq_get(usb->ep0->empty_frame_Q);
+ pkt = cq_get(&usb->ep0->empty_frame_Q);
if (!pkt) {
fhci_dbg(usb->fhci, "there is no empty frame\n");
return -1;
@@ -222,7 +222,7 @@ static int add_packet(struct fhci_usb *usb, struct ed *ed, struct td *td)
pkt->info = 0;
if (data == NULL) {
- data = cq_get(usb->ep0->dummy_packets_Q);
+ data = cq_get(&usb->ep0->dummy_packets_Q);
BUG_ON(!data);
pkt->info = PKT_DUMMY_PACKET;
}
@@ -246,7 +246,7 @@ static int add_packet(struct fhci_usb *usb, struct ed *ed, struct td *td)
list_del_init(&td->frame_lh);
td->status = USB_TD_OK;
if (pkt->info & PKT_DUMMY_PACKET)
- cq_put(usb->ep0->dummy_packets_Q, pkt->data);
+ cq_put(&usb->ep0->dummy_packets_Q, pkt->data);
recycle_frame(usb, pkt);
usb->actual_frame->total_bytes -= (len + PROTOCOL_OVERHEAD);
fhci_err(usb->fhci, "host transaction failed\n");
diff --git a/drivers/usb/host/fhci-tds.c b/drivers/usb/host/fhci-tds.c
index b40332290319..d224ab467a40 100644
--- a/drivers/usb/host/fhci-tds.c
+++ b/drivers/usb/host/fhci-tds.c
@@ -106,33 +106,33 @@ void fhci_ep0_free(struct fhci_usb *usb)
cpm_muram_free(cpm_muram_offset(ep->td_base));
if (ep->conf_frame_Q) {
- size = cq_howmany(ep->conf_frame_Q);
+ size = cq_howmany(&ep->conf_frame_Q);
for (; size; size--) {
- struct packet *pkt = cq_get(ep->conf_frame_Q);
+ struct packet *pkt = cq_get(&ep->conf_frame_Q);
kfree(pkt);
}
- cq_delete(ep->conf_frame_Q);
+ cq_delete(&ep->conf_frame_Q);
}
if (ep->empty_frame_Q) {
- size = cq_howmany(ep->empty_frame_Q);
+ size = cq_howmany(&ep->empty_frame_Q);
for (; size; size--) {
- struct packet *pkt = cq_get(ep->empty_frame_Q);
+ struct packet *pkt = cq_get(&ep->empty_frame_Q);
kfree(pkt);
}
- cq_delete(ep->empty_frame_Q);
+ cq_delete(&ep->empty_frame_Q);
}
if (ep->dummy_packets_Q) {
- size = cq_howmany(ep->dummy_packets_Q);
+ size = cq_howmany(&ep->dummy_packets_Q);
for (; size; size--) {
- u8 *buff = cq_get(ep->dummy_packets_Q);
+ u8 *buff = cq_get(&ep->dummy_packets_Q);
kfree(buff);
}
- cq_delete(ep->dummy_packets_Q);
+ cq_delete(&ep->dummy_packets_Q);
}
kfree(ep);
@@ -175,10 +175,9 @@ u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
ep->td_base = cpm_muram_addr(ep_offset);
/* zero all queue pointers */
- ep->conf_frame_Q = cq_new(ring_len + 2);
- ep->empty_frame_Q = cq_new(ring_len + 2);
- ep->dummy_packets_Q = cq_new(ring_len + 2);
- if (!ep->conf_frame_Q || !ep->empty_frame_Q || !ep->dummy_packets_Q) {
+ if (cq_new(&ep->conf_frame_Q, ring_len + 2) ||
+ cq_new(&ep->empty_frame_Q, ring_len + 2) ||
+ cq_new(&ep->dummy_packets_Q, ring_len + 2)) {
err_for = "frame_queues";
goto err;
}
@@ -199,8 +198,8 @@ u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
err_for = "buffer";
goto err;
}
- cq_put(ep->empty_frame_Q, pkt);
- cq_put(ep->dummy_packets_Q, buff);
+ cq_put(&ep->empty_frame_Q, pkt);
+ cq_put(&ep->dummy_packets_Q, buff);
}
/* we put the endpoint parameter RAM right behind the TD ring */
@@ -319,7 +318,7 @@ static void fhci_td_transaction_confirm(struct fhci_usb *usb)
if ((buf == DUMMY2_BD_BUFFER) && !(td_status & ~TD_W))
continue;
- pkt = cq_get(ep->conf_frame_Q);
+ pkt = cq_get(&ep->conf_frame_Q);
if (!pkt)
fhci_err(usb->fhci, "no frame to confirm\n");
@@ -460,9 +459,9 @@ u32 fhci_host_transaction(struct fhci_usb *usb,
out_be16(&td->length, pkt->len);
/* put the frame to the confirmation queue */
- cq_put(ep->conf_frame_Q, pkt);
+ cq_put(&ep->conf_frame_Q, pkt);
- if (cq_howmany(ep->conf_frame_Q) == 1)
+ if (cq_howmany(&ep->conf_frame_Q) == 1)
out_8(&usb->fhci->regs->usb_comm, USB_CMD_STR_FIFO);
return 0;
diff --git a/drivers/usb/host/fhci.h b/drivers/usb/host/fhci.h
index 7116284ed21a..2277428ef5d3 100644
--- a/drivers/usb/host/fhci.h
+++ b/drivers/usb/host/fhci.h
@@ -423,9 +423,9 @@ struct endpoint {
struct usb_td __iomem *td_base; /* first TD in the ring */
struct usb_td __iomem *conf_td; /* next TD for confirm after transac */
struct usb_td __iomem *empty_td;/* next TD for new transaction req. */
- struct kfifo *empty_frame_Q; /* Empty frames list to use */
- struct kfifo *conf_frame_Q; /* frames passed to TDs,waiting for tx */
- struct kfifo *dummy_packets_Q;/* dummy packets for the CRC overun */
+ struct kfifo empty_frame_Q; /* Empty frames list to use */
+ struct kfifo conf_frame_Q; /* frames passed to TDs,waiting for tx */
+ struct kfifo dummy_packets_Q;/* dummy packets for the CRC overun */
bool already_pushed_dummy_bd;
};
@@ -493,9 +493,9 @@ static inline struct usb_hcd *fhci_to_hcd(struct fhci_hcd *fhci)
}
/* fifo of pointers */
-static inline struct kfifo *cq_new(int size)
+static inline int cq_new(struct kfifo *fifo, int size)
{
- return kfifo_alloc(size * sizeof(void *), GFP_KERNEL, NULL);
+ return kfifo_alloc(fifo, size * sizeof(void *), GFP_KERNEL, NULL);
}
static inline void cq_delete(struct kfifo *kfifo)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 4543f359be75..44b72d47fac2 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -939,9 +939,8 @@ int usb_serial_probe(struct usb_interface *interface,
dev_err(&interface->dev, "No free urbs available\n");
goto probe_error;
}
- port->write_fifo = kfifo_alloc(PAGE_SIZE, GFP_KERNEL,
- &port->lock);
- if (IS_ERR(port->write_fifo))
+ if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL,
+ &port->lock))
goto probe_error;
buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
port->bulk_out_size = buffer_size;