Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 485 insertions, 0 deletions

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-ioread.c b/drivers/media/usb/pvrusb2/pvrusb2-ioread.c
new file mode 100644
index 000000000..46f801384
--- /dev/null
+++ b/drivers/media/usb/pvrusb2/pvrusb2-ioread.c
@@ -0,0 +1,485 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
+ */
+
+#include "pvrusb2-ioread.h"
+#include "pvrusb2-debug.h"
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+
+#define BUFFER_COUNT 32
+#define BUFFER_SIZE PAGE_ALIGN(0x4000)
+
+struct pvr2_ioread {
+	struct pvr2_stream *stream;
+	char *buffer_storage[BUFFER_COUNT];
+	char *sync_key_ptr;
+	unsigned int sync_key_len;
+	unsigned int sync_buf_offs;
+	unsigned int sync_state;
+	unsigned int sync_trashed_count;
+	int enabled;         // Streaming is on
+	int spigot_open;     // OK to pass data to client
+	int stream_running;  // Passing data to client now
+
+	/* State relevant to current buffer being read */
+	struct pvr2_buffer *c_buf;
+	char *c_data_ptr;
+	unsigned int c_data_len;
+	unsigned int c_data_offs;
+	struct mutex mutex;
+};
+
+static int pvr2_ioread_init(struct pvr2_ioread *cp)
+{
+	unsigned int idx;
+
+	cp->stream = NULL;
+	mutex_init(&cp->mutex);
+
+	for (idx = 0; idx < BUFFER_COUNT; idx++) {
+		cp->buffer_storage[idx] = kmalloc(BUFFER_SIZE,GFP_KERNEL);
+		if (!(cp->buffer_storage[idx])) break;
+	}
+
+	if (idx < BUFFER_COUNT) {
+		// An allocation appears to have failed
+		for (idx = 0; idx < BUFFER_COUNT; idx++) {
+			if (!(cp->buffer_storage[idx])) continue;
+			kfree(cp->buffer_storage[idx]);
+		}
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static void pvr2_ioread_done(struct pvr2_ioread *cp)
+{
+	unsigned int idx;
+
+	pvr2_ioread_setup(cp,NULL);
+	for (idx = 0; idx < BUFFER_COUNT; idx++) {
+		if (!(cp->buffer_storage[idx])) continue;
+		kfree(cp->buffer_storage[idx]);
+	}
+}
+
+struct pvr2_ioread *pvr2_ioread_create(void)
+{
+	struct pvr2_ioread *cp;
+	cp = kzalloc(sizeof(*cp),GFP_KERNEL);
+	if (!cp) return NULL;
+	pvr2_trace(PVR2_TRACE_STRUCT,"pvr2_ioread_create id=%p",cp);
+	if (pvr2_ioread_init(cp) < 0) {
+		kfree(cp);
+		return NULL;
+	}
+	return cp;
+}
+
+void pvr2_ioread_destroy(struct pvr2_ioread *cp)
+{
+	if (!cp) return;
+	pvr2_ioread_done(cp);
+	pvr2_trace(PVR2_TRACE_STRUCT,"pvr2_ioread_destroy id=%p",cp);
+	if (cp->sync_key_ptr) {
+		kfree(cp->sync_key_ptr);
+		cp->sync_key_ptr = NULL;
+	}
+	kfree(cp);
+}
+
+void pvr2_ioread_set_sync_key(struct pvr2_ioread *cp,
+			      const char *sync_key_ptr,
+			      unsigned int sync_key_len)
+{
+	if (!cp) return;
+
+	if (!sync_key_ptr) sync_key_len = 0;
+	if ((sync_key_len == cp->sync_key_len) &&
+	    ((!sync_key_len) ||
+	     (!memcmp(sync_key_ptr,cp->sync_key_ptr,sync_key_len)))) return;
+
+	if (sync_key_len != cp->sync_key_len) {
+		if (cp->sync_key_ptr) {
+			kfree(cp->sync_key_ptr);
+			cp->sync_key_ptr = NULL;
+		}
+		cp->sync_key_len = 0;
+		if (sync_key_len) {
+			cp->sync_key_ptr = kmalloc(sync_key_len,GFP_KERNEL);
+			if (cp->sync_key_ptr) {
+				cp->sync_key_len = sync_key_len;
+			}
+		}
+	}
+	if (!cp->sync_key_len) return;
+	memcpy(cp->sync_key_ptr,sync_key_ptr,cp->sync_key_len);
+}
+
+static void pvr2_ioread_stop(struct pvr2_ioread *cp)
+{
+	if (!(cp->enabled)) return;
+	pvr2_trace(PVR2_TRACE_START_STOP,
+		   "/*---TRACE_READ---*/ pvr2_ioread_stop id=%p",cp);
+	pvr2_stream_kill(cp->stream);
+	cp->c_buf = NULL;
+	cp->c_data_ptr = NULL;
+	cp->c_data_len = 0;
+	cp->c_data_offs = 0;
+	cp->enabled = 0;
+	cp->stream_running = 0;
+	cp->spigot_open = 0;
+	if (cp->sync_state) {
+		pvr2_trace(PVR2_TRACE_DATA_FLOW,
+			   "/*---TRACE_READ---*/ sync_state <== 0");
+		cp->sync_state = 0;
+	}
+}
+
+static int pvr2_ioread_start(struct pvr2_ioread *cp)
+{
+	int stat;
+	struct pvr2_buffer *bp;
+	if (cp->enabled) return 0;
+	if (!(cp->stream)) return 0;
+	pvr2_trace(PVR2_TRACE_START_STOP,
+		   "/*---TRACE_READ---*/ pvr2_ioread_start id=%p",cp);
+	while ((bp = pvr2_stream_get_idle_buffer(cp->stream)) != NULL) {
+		stat = pvr2_buffer_queue(bp);
+		if (stat < 0) {
+			pvr2_trace(PVR2_TRACE_DATA_FLOW,
+				   "/*---TRACE_READ---*/ pvr2_ioread_start id=%p error=%d",
+				   cp,stat);
+			pvr2_ioread_stop(cp);
+			return stat;
+		}
+	}
+	cp->enabled = !0;
+	cp->c_buf = NULL;
+	cp->c_data_ptr = NULL;
+	cp->c_data_len = 0;
+	cp->c_data_offs = 0;
+	cp->stream_running = 0;
+	if (cp->sync_key_len) {
+		pvr2_trace(PVR2_TRACE_DATA_FLOW,
+			   "/*---TRACE_READ---*/ sync_state <== 1");
+		cp->sync_state = 1;
+		cp->sync_trashed_count = 0;
+		cp->sync_buf_offs = 0;
+	}
+	cp->spigot_open = 0;
+	return 0;
+}
+
+struct pvr2_stream *pvr2_ioread_get_stream(struct pvr2_ioread *cp)
+{
+	return cp->stream;
+}
+
+int pvr2_ioread_setup(struct pvr2_ioread *cp,struct pvr2_stream *sp)
+{
+	int ret;
+	unsigned int idx;
+	struct pvr2_buffer *bp;
+
+	mutex_lock(&cp->mutex);
+	do {
+		if (cp->stream) {
+			pvr2_trace(PVR2_TRACE_START_STOP,
+				   "/*---TRACE_READ---*/ pvr2_ioread_setup (tear-down) id=%p",
+				   cp);
+			pvr2_ioread_stop(cp);
+			pvr2_stream_kill(cp->stream);
+			if (pvr2_stream_get_buffer_count(cp->stream)) {
+				pvr2_stream_set_buffer_count(cp->stream,0);
+			}
+			cp->stream = NULL;
+		}
+		if (sp) {
+			pvr2_trace(PVR2_TRACE_START_STOP,
+				   "/*---TRACE_READ---*/ pvr2_ioread_setup (setup) id=%p",
+				   cp);
+			pvr2_stream_kill(sp);
+			ret = pvr2_stream_set_buffer_count(sp,BUFFER_COUNT);
+			if (ret < 0) {
+				mutex_unlock(&cp->mutex);
+				return ret;
+			}
+			for (idx = 0; idx < BUFFER_COUNT; idx++) {
+				bp = pvr2_stream_get_buffer(sp,idx);
+				pvr2_buffer_set_buffer(bp,
+						       cp->buffer_storage[idx],
+						       BUFFER_SIZE);
+			}
+			cp->stream = sp;
+		}
+	} while (0);
+	mutex_unlock(&cp->mutex);
+
+	return 0;
+}
+
+int pvr2_ioread_set_enabled(struct pvr2_ioread *cp,int fl)
+{
+	int ret = 0;
+	if ((!fl) == (!(cp->enabled))) return ret;
+
+	mutex_lock(&cp->mutex);
+	do {
+		if (fl) {
+			ret = pvr2_ioread_start(cp);
+		} else {
+			pvr2_ioread_stop(cp);
+		}
+	} while (0);
+	mutex_unlock(&cp->mutex);
+	return ret;
+}
+
+static int pvr2_ioread_get_buffer(struct pvr2_ioread *cp)
+{
+	int stat;
+
+	while (cp->c_data_len <= cp->c_data_offs) {
+		if (cp->c_buf) {
+			// Flush out current buffer first.
+			stat = pvr2_buffer_queue(cp->c_buf);
+			if (stat < 0) {
+				// Streaming error...
+				pvr2_trace(PVR2_TRACE_DATA_FLOW,
+					   "/*---TRACE_READ---*/ pvr2_ioread_read id=%p queue_error=%d",
+					   cp,stat);
+				pvr2_ioread_stop(cp);
+				return 0;
+			}
+			cp->c_buf = NULL;
+			cp->c_data_ptr = NULL;
+			cp->c_data_len = 0;
+			cp->c_data_offs = 0;
+		}
+		// Now get a freshly filled buffer.
+		cp->c_buf = pvr2_stream_get_ready_buffer(cp->stream);
+		if (!cp->c_buf) break; // Nothing ready; done.
+		cp->c_data_len = pvr2_buffer_get_count(cp->c_buf);
+		if (!cp->c_data_len) {
+			// Nothing transferred.  Was there an error?
+			stat = pvr2_buffer_get_status(cp->c_buf);
+			if (stat < 0) {
+				// Streaming error...
+				pvr2_trace(PVR2_TRACE_DATA_FLOW,
+					   "/*---TRACE_READ---*/ pvr2_ioread_read id=%p buffer_error=%d",
+					   cp,stat);
+				pvr2_ioread_stop(cp);
+				// Give up.
+				return 0;
+			}
+			// Start over...
+			continue;
+		}
+		cp->c_data_offs = 0;
+		cp->c_data_ptr = cp->buffer_storage[
+			pvr2_buffer_get_id(cp->c_buf)];
+	}
+	return !0;
+}
+
+static void pvr2_ioread_filter(struct pvr2_ioread *cp)
+{
+	unsigned int idx;
+	if (!cp->enabled) return;
+	if (cp->sync_state != 1) return;
+
+	// Search the stream for our synchronization key.  This is made
+	// complicated by the fact that in order to be honest with
+	// ourselves here we must search across buffer boundaries...
+	mutex_lock(&cp->mutex);
+	while (1) {
+		// Ensure we have a buffer
+		if (!pvr2_ioread_get_buffer(cp)) break;
+		if (!cp->c_data_len) break;
+
+		// Now walk the buffer contents until we match the key or
+		// run out of buffer data.
+		for (idx = cp->c_data_offs; idx < cp->c_data_len; idx++) {
+			if (cp->sync_buf_offs >= cp->sync_key_len) break;
+			if (cp->c_data_ptr[idx] ==
+			    cp->sync_key_ptr[cp->sync_buf_offs]) {
+				// Found the next key byte
+				(cp->sync_buf_offs)++;
+			} else {
+				// Whoops, mismatched.  Start key over...
+				cp->sync_buf_offs = 0;
+			}
+		}
+
+		// Consume what we've walked through
+		cp->c_data_offs += idx;
+		cp->sync_trashed_count += idx;
+
+		// If we've found the key, then update state and get out.
+		if (cp->sync_buf_offs >= cp->sync_key_len) {
+			cp->sync_trashed_count -= cp->sync_key_len;
+			pvr2_trace(PVR2_TRACE_DATA_FLOW,
+				   "/*---TRACE_READ---*/ sync_state <== 2 (skipped %u bytes)",
+				   cp->sync_trashed_count);
+			cp->sync_state = 2;
+			cp->sync_buf_offs = 0;
+			break;
+		}
+
+		if (cp->c_data_offs < cp->c_data_len) {
+			// Sanity check - should NEVER get here
+			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
+				   "ERROR: pvr2_ioread filter sync problem len=%u offs=%u",
+				   cp->c_data_len,cp->c_data_offs);
+			// Get out so we don't get stuck in an infinite
+			// loop.
+			break;
+		}
+
+		continue; // (for clarity)
+	}
+	mutex_unlock(&cp->mutex);
+}
+
+int pvr2_ioread_avail(struct pvr2_ioread *cp)
+{
+	int ret;
+	if (!(cp->enabled)) {
+		// Stream is not enabled; so this is an I/O error
+		return -EIO;
+	}
+
+	if (cp->sync_state == 1) {
+		pvr2_ioread_filter(cp);
+		if (cp->sync_state == 1) return -EAGAIN;
+	}
+
+	ret = 0;
+	if (cp->stream_running) {
+		if (!pvr2_stream_get_ready_count(cp->stream)) {
+			// No data available at all right now.
+			ret = -EAGAIN;
+		}
+	} else {
+		if (pvr2_stream_get_ready_count(cp->stream) < BUFFER_COUNT/2) {
+			// Haven't buffered up enough yet; try again later
+			ret = -EAGAIN;
+		}
+	}
+
+	if ((!(cp->spigot_open)) != (!(ret == 0))) {
+		cp->spigot_open = (ret == 0);
+		pvr2_trace(PVR2_TRACE_DATA_FLOW,
+			   "/*---TRACE_READ---*/ data is %s",
+			   cp->spigot_open ? "available" : "pending");
+	}
+
+	return ret;
+}
+
+int pvr2_ioread_read(struct pvr2_ioread *cp,void __user *buf,unsigned int cnt)
+{
+	unsigned int copied_cnt;
+	unsigned int bcnt;
+	const char *src;
+	int stat;
+	int ret = 0;
+	unsigned int req_cnt = cnt;
+
+	if (!cnt) {
+		pvr2_trace(PVR2_TRACE_TRAP,
+			   "/*---TRACE_READ---*/ pvr2_ioread_read id=%p ZERO Request? Returning zero.",
+cp);
+		return 0;
+	}
+
+	stat = pvr2_ioread_avail(cp);
+	if (stat < 0) return stat;
+
+	cp->stream_running = !0;
+
+	mutex_lock(&cp->mutex);
+	do {
+
+		// Suck data out of the buffers and copy to the user
+		copied_cnt = 0;
+		if (!buf) cnt = 0;
+		while (1) {
+			if (!pvr2_ioread_get_buffer(cp)) {
+				ret = -EIO;
+				break;
+			}
+
+			if (!cnt) break;
+
+			if (cp->sync_state == 2) {
+				// We're repeating the sync key data into
+				// the stream.
+				src = cp->sync_key_ptr + cp->sync_buf_offs;
+				bcnt = cp->sync_key_len - cp->sync_buf_offs;
+			} else {
+				// Normal buffer copy
+				src = cp->c_data_ptr + cp->c_data_offs;
+				bcnt = cp->c_data_len - cp->c_data_offs;
+			}
+
+			if (!bcnt) break;
+
+			// Don't run past user's buffer
+			if (bcnt > cnt) bcnt = cnt;
+
+			if (copy_to_user(buf,src,bcnt)) {
+				// User supplied a bad pointer?
+				// Give up - this *will* cause data
+				// to be lost.
+				ret = -EFAULT;
+				break;
+			}
+			cnt -= bcnt;
+			buf += bcnt;
+			copied_cnt += bcnt;
+
+			if (cp->sync_state == 2) {
+				// Update offset inside sync key that we're
+				// repeating back out.
+				cp->sync_buf_offs += bcnt;
+				if (cp->sync_buf_offs >= cp->sync_key_len) {
+					// Consumed entire key; switch mode
+					// to normal.
+					pvr2_trace(PVR2_TRACE_DATA_FLOW,
+						   "/*---TRACE_READ---*/ sync_state <== 0");
+					cp->sync_state = 0;
+				}
+			} else {
+				// Update buffer offset.
+				cp->c_data_offs += bcnt;
+			}
+		}
+
+	} while (0);
+	mutex_unlock(&cp->mutex);
+
+	if (!ret) {
+		if (copied_cnt) {
+			// If anything was copied, return that count
+			ret = copied_cnt;
+		} else {
+			// Nothing copied; suggest to caller that another
+			// attempt should be tried again later
+			ret = -EAGAIN;
+		}
+	}
+
+	pvr2_trace(PVR2_TRACE_DATA_FLOW,
+		   "/*---TRACE_READ---*/ pvr2_ioread_read id=%p request=%d result=%d",
+		   cp,req_cnt,ret);
+	return ret;
+}