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remarkable-linux/drivers/usb/renesas_usbhs/pipe.c
Kuninori Morimoto 1c90ee0b3e usb: renesas_usbhs: use transfer counter if IN direction bulk pipe 
received data will break if it was bulk pipe and large data size,
because pipe kept BUF PID even though it doesn't have enough buffer.
To avoid this issue, renesas_usbhs can use transfer counter.
Pipe PID will be NAK if it didn't have enough buffer by this patch.

renesas_usbhs has strange address mapping.
Thus, it is difficult to calculate transfer counter setting address.
This patch use fixed table for it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-11-08 15:46:06 +02:00

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/*
* Renesas USB driver
*
* Copyright (C) 2011 Renesas Solutions Corp.
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include "common.h"
#include "pipe.h"
/*
* macros
*/
#define usbhsp_addr_offset(p) ((usbhs_pipe_number(p) - 1) * 2)
#define usbhsp_flags_set(p, f) ((p)->flags |= USBHS_PIPE_FLAGS_##f)
#define usbhsp_flags_clr(p, f) ((p)->flags &= ~USBHS_PIPE_FLAGS_##f)
#define usbhsp_flags_has(p, f) ((p)->flags & USBHS_PIPE_FLAGS_##f)
#define usbhsp_flags_init(p) do {(p)->flags = 0; } while (0)
/*
* for debug
*/
static char *usbhsp_pipe_name[] = {
[USB_ENDPOINT_XFER_CONTROL] = "DCP",
[USB_ENDPOINT_XFER_BULK] = "BULK",
[USB_ENDPOINT_XFER_INT] = "INT",
[USB_ENDPOINT_XFER_ISOC] = "ISO",
};
char *usbhs_pipe_name(struct usbhs_pipe *pipe)
{
return usbhsp_pipe_name[usbhs_pipe_type(pipe)];
}
/*
* DCPCTR/PIPEnCTR functions
*/
static void usbhsp_pipectrl_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
int offset = usbhsp_addr_offset(pipe);
if (usbhs_pipe_is_dcp(pipe))
usbhs_bset(priv, DCPCTR, mask, val);
else
usbhs_bset(priv, PIPEnCTR + offset, mask, val);
}
static u16 usbhsp_pipectrl_get(struct usbhs_pipe *pipe)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
int offset = usbhsp_addr_offset(pipe);
if (usbhs_pipe_is_dcp(pipe))
return usbhs_read(priv, DCPCTR);
else
return usbhs_read(priv, PIPEnCTR + offset);
}
/*
* DCP/PIPE functions
*/
static void __usbhsp_pipe_xxx_set(struct usbhs_pipe *pipe,
u16 dcp_reg, u16 pipe_reg,
u16 mask, u16 val)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
if (usbhs_pipe_is_dcp(pipe))
usbhs_bset(priv, dcp_reg, mask, val);
else
usbhs_bset(priv, pipe_reg, mask, val);
}
/*
* DCPCFG/PIPECFG functions
*/
static void usbhsp_pipe_cfg_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
__usbhsp_pipe_xxx_set(pipe, DCPCFG, PIPECFG, mask, val);
}
/*
* PIPEnTRN/PIPEnTRE functions
*/
static void usbhsp_pipe_trn_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
struct device *dev = usbhs_priv_to_dev(priv);
int num = usbhs_pipe_number(pipe);
u16 reg;
/*
* It is impossible to calculate address,
* since PIPEnTRN addresses were mapped randomly.
*/
#define CASE_PIPExTRN(a) \
case 0x ## a: \
reg = PIPE ## a ## TRN; \
break;
switch (num) {
CASE_PIPExTRN(1);
CASE_PIPExTRN(2);
CASE_PIPExTRN(3);
CASE_PIPExTRN(4);
CASE_PIPExTRN(5);
CASE_PIPExTRN(B);
CASE_PIPExTRN(C);
CASE_PIPExTRN(D);
CASE_PIPExTRN(E);
CASE_PIPExTRN(F);
CASE_PIPExTRN(9);
CASE_PIPExTRN(A);
default:
dev_err(dev, "unknown pipe (%d)\n", num);
return;
}
__usbhsp_pipe_xxx_set(pipe, 0, reg, mask, val);
}
static void usbhsp_pipe_tre_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
struct device *dev = usbhs_priv_to_dev(priv);
int num = usbhs_pipe_number(pipe);
u16 reg;
/*
* It is impossible to calculate address,
* since PIPEnTRE addresses were mapped randomly.
*/
#define CASE_PIPExTRE(a) \
case 0x ## a: \
reg = PIPE ## a ## TRE; \
break;
switch (num) {
CASE_PIPExTRE(1);
CASE_PIPExTRE(2);
CASE_PIPExTRE(3);
CASE_PIPExTRE(4);
CASE_PIPExTRE(5);
CASE_PIPExTRE(B);
CASE_PIPExTRE(C);
CASE_PIPExTRE(D);
CASE_PIPExTRE(E);
CASE_PIPExTRE(F);
CASE_PIPExTRE(9);
CASE_PIPExTRE(A);
default:
dev_err(dev, "unknown pipe (%d)\n", num);
return;
}
__usbhsp_pipe_xxx_set(pipe, 0, reg, mask, val);
}
/*
* PIPEBUF
*/
static void usbhsp_pipe_buf_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
if (usbhs_pipe_is_dcp(pipe))
return;
__usbhsp_pipe_xxx_set(pipe, 0, PIPEBUF, mask, val);
}
/*
* DCPMAXP/PIPEMAXP
*/
static void usbhsp_pipe_maxp_set(struct usbhs_pipe *pipe, u16 mask, u16 val)
{
__usbhsp_pipe_xxx_set(pipe, DCPMAXP, PIPEMAXP, mask, val);
}
/*
* pipe control functions
*/
static void usbhsp_pipe_select(struct usbhs_pipe *pipe)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
/*
* On pipe, this is necessary before
* accesses to below registers.
*
* PIPESEL : usbhsp_pipe_select
* PIPECFG : usbhsp_pipe_cfg_xxx
* PIPEBUF : usbhsp_pipe_buf_xxx
* PIPEMAXP : usbhsp_pipe_maxp_xxx
* PIPEPERI
*/
/*
* if pipe is dcp, no pipe is selected.
* it is no problem, because dcp have its register
*/
usbhs_write(priv, PIPESEL, 0xF & usbhs_pipe_number(pipe));
}
static int usbhsp_pipe_barrier(struct usbhs_pipe *pipe)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
int timeout = 1024;
u16 val;
/*
* make sure....
*
* Modify these bits when CSSTS = 0, PID = NAK, and no pipe number is
* specified by the CURPIPE bits.
* When changing the setting of this bit after changing
* the PID bits for the selected pipe from BUF to NAK,
* check that CSSTS = 0 and PBUSY = 0.
*/
/*
* CURPIPE bit = 0
*
* see also
* "Operation"
* - "Pipe Control"
* - "Pipe Control Registers Switching Procedure"
*/
usbhs_write(priv, CFIFOSEL, 0);
usbhs_pipe_disable(pipe);
do {
val = usbhsp_pipectrl_get(pipe);
val &= CSSTS | PID_MASK;
if (!val)
return 0;
udelay(10);
} while (timeout--);
return -EBUSY;
}
int usbhs_pipe_is_accessible(struct usbhs_pipe *pipe)
{
u16 val;
val = usbhsp_pipectrl_get(pipe);
if (val & BSTS)
return 0;
return -EBUSY;
}
/*
* PID ctrl
*/
static void __usbhsp_pid_try_nak_if_stall(struct usbhs_pipe *pipe)
{
u16 pid = usbhsp_pipectrl_get(pipe);
pid &= PID_MASK;
/*
* see
* "Pipe n Control Register" - "PID"
*/
switch (pid) {
case PID_STALL11:
usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL10);
/* fall-through */
case PID_STALL10:
usbhsp_pipectrl_set(pipe, PID_MASK, PID_NAK);
}
}
void usbhs_pipe_disable(struct usbhs_pipe *pipe)
{
int timeout = 1024;
u16 val;
/* see "Pipe n Control Register" - "PID" */
__usbhsp_pid_try_nak_if_stall(pipe);
usbhsp_pipectrl_set(pipe, PID_MASK, PID_NAK);
do {
val = usbhsp_pipectrl_get(pipe);
val &= PBUSY;
if (!val)
break;
udelay(10);
} while (timeout--);
}
void usbhs_pipe_enable(struct usbhs_pipe *pipe)
{
/* see "Pipe n Control Register" - "PID" */
__usbhsp_pid_try_nak_if_stall(pipe);
usbhsp_pipectrl_set(pipe, PID_MASK, PID_BUF);
}
void usbhs_pipe_stall(struct usbhs_pipe *pipe)
{
u16 pid = usbhsp_pipectrl_get(pipe);
pid &= PID_MASK;
/*
* see
* "Pipe n Control Register" - "PID"
*/
switch (pid) {
case PID_NAK:
usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL10);
break;
case PID_BUF:
usbhsp_pipectrl_set(pipe, PID_MASK, PID_STALL11);
break;
}
}
int usbhs_pipe_is_stall(struct usbhs_pipe *pipe)
{
u16 pid = usbhsp_pipectrl_get(pipe) & PID_MASK;
return (int)(pid == PID_STALL10 || pid == PID_STALL11);
}
void usbhs_pipe_set_trans_count_if_bulk(struct usbhs_pipe *pipe, int len)
{
if (!usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
return;
/*
* clear and disable transfer counter for IN/OUT pipe
*/
usbhsp_pipe_tre_set(pipe, TRCLR | TRENB, TRCLR);
/*
* Only IN direction bulk pipe can use transfer count.
* Without using this function,
* received data will break if it was large data size.
* see PIPEnTRN/PIPEnTRE for detail
*/
if (usbhs_pipe_is_dir_in(pipe)) {
int maxp = usbhs_pipe_get_maxpacket(pipe);
usbhsp_pipe_trn_set(pipe, 0xffff, DIV_ROUND_UP(len, maxp));
usbhsp_pipe_tre_set(pipe, TRENB, TRENB); /* enable */
}
}
/*
* pipe setup
*/
static int usbhsp_possible_double_buffer(struct usbhs_pipe *pipe)
{
/*
* only ISO / BULK pipe can use double buffer
*/
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK) ||
usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
return 1;
return 0;
}
static u16 usbhsp_setup_pipecfg(struct usbhs_pipe *pipe,
int is_host,
int dir_in)
{
u16 type = 0;
u16 bfre = 0;
u16 dblb = 0;
u16 cntmd = 0;
u16 dir = 0;
u16 epnum = 0;
u16 shtnak = 0;
u16 type_array[] = {
[USB_ENDPOINT_XFER_BULK] = TYPE_BULK,
[USB_ENDPOINT_XFER_INT] = TYPE_INT,
[USB_ENDPOINT_XFER_ISOC] = TYPE_ISO,
};
int is_double = usbhsp_possible_double_buffer(pipe);
if (usbhs_pipe_is_dcp(pipe))
return -EINVAL;
/*
* PIPECFG
*
* see
* - "Register Descriptions" - "PIPECFG" register
* - "Features" - "Pipe configuration"
* - "Operation" - "Pipe Control"
*/
/* TYPE */
type = type_array[usbhs_pipe_type(pipe)];
/* BFRE */
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC) ||
usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
bfre = 0; /* FIXME */
/* DBLB */
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC) ||
usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
dblb = (is_double) ? DBLB : 0;
/* CNTMD */
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
cntmd = 0; /* FIXME */
/* DIR */
if (dir_in)
usbhsp_flags_set(pipe, IS_DIR_HOST);
if (!!is_host ^ !!dir_in)
dir |= DIR_OUT;
if (!dir)
usbhsp_flags_set(pipe, IS_DIR_IN);
/* SHTNAK */
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK) &&
!dir)
shtnak = SHTNAK;
/* EPNUM */
epnum = 0; /* see usbhs_pipe_config_update() */
return type |
bfre |
dblb |
cntmd |
dir |
shtnak |
epnum;
}
static u16 usbhsp_setup_pipebuff(struct usbhs_pipe *pipe)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
struct device *dev = usbhs_priv_to_dev(priv);
int pipe_num = usbhs_pipe_number(pipe);
int is_double = usbhsp_possible_double_buffer(pipe);
u16 buff_size;
u16 bufnmb;
u16 bufnmb_cnt;
/*
* PIPEBUF
*
* see
* - "Register Descriptions" - "PIPEBUF" register
* - "Features" - "Pipe configuration"
* - "Operation" - "FIFO Buffer Memory"
* - "Operation" - "Pipe Control"
*
* ex) if pipe6 - pipe9 are USB_ENDPOINT_XFER_INT (SH7724)
*
* BUFNMB: PIPE
* 0: pipe0 (DCP 256byte)
* 1: -
* 2: -
* 3: -
* 4: pipe6 (INT 64byte)
* 5: pipe7 (INT 64byte)
* 6: pipe8 (INT 64byte)
* 7: pipe9 (INT 64byte)
* 8 - xx: free (for BULK, ISOC)
*/
/*
* FIXME
*
* it doesn't have good buffer allocator
*
* DCP : 256 byte
* BULK: 512 byte
* INT : 64 byte
* ISOC: 512 byte
*/
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_CONTROL))
buff_size = 256;
else if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_INT))
buff_size = 64;
else
buff_size = 512;
/* change buff_size to register value */
bufnmb_cnt = (buff_size / 64) - 1;
/* BUFNMB has been reserved for INT pipe
* see above */
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_INT)) {
bufnmb = pipe_num - 2;
} else {
bufnmb = info->bufnmb_last;
info->bufnmb_last += bufnmb_cnt + 1;
/*
* double buffer
*/
if (is_double)
info->bufnmb_last += bufnmb_cnt + 1;
}
dev_dbg(dev, "pipe : %d : buff_size 0x%x: bufnmb 0x%x\n",
pipe_num, buff_size, bufnmb);
return (0x1f & bufnmb_cnt) << 10 |
(0xff & bufnmb) << 0;
}
void usbhs_pipe_config_update(struct usbhs_pipe *pipe, u16 devsel,
u16 epnum, u16 maxp)
{
if (devsel > 0xA) {
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
struct device *dev = usbhs_priv_to_dev(priv);
dev_err(dev, "devsel error %d\n", devsel);
devsel = 0;
}
usbhsp_pipe_barrier(pipe);
pipe->maxp = maxp;
usbhsp_pipe_select(pipe);
usbhsp_pipe_maxp_set(pipe, 0xFFFF,
(devsel << 12) |
maxp);
if (!usbhs_pipe_is_dcp(pipe))
usbhsp_pipe_cfg_set(pipe, 0x000F, epnum);
}
/*
* pipe control
*/
int usbhs_pipe_get_maxpacket(struct usbhs_pipe *pipe)
{
/*
* see
* usbhs_pipe_config_update()
* usbhs_dcp_malloc()
*/
return pipe->maxp;
}
int usbhs_pipe_is_dir_in(struct usbhs_pipe *pipe)
{
return usbhsp_flags_has(pipe, IS_DIR_IN);
}
int usbhs_pipe_is_dir_host(struct usbhs_pipe *pipe)
{
return usbhsp_flags_has(pipe, IS_DIR_HOST);
}
void usbhs_pipe_data_sequence(struct usbhs_pipe *pipe, int sequence)
{
u16 mask = (SQCLR | SQSET);
u16 val;
/*
* sequence
* 0 : data0
* 1 : data1
* -1 : no change
*/
switch (sequence) {
case 0:
val = SQCLR;
break;
case 1:
val = SQSET;
break;
default:
return;
}
usbhsp_pipectrl_set(pipe, mask, val);
}
void usbhs_pipe_clear(struct usbhs_pipe *pipe)
{
usbhsp_pipectrl_set(pipe, ACLRM, ACLRM);
usbhsp_pipectrl_set(pipe, ACLRM, 0);
}
static struct usbhs_pipe *usbhsp_get_pipe(struct usbhs_priv *priv, u32 type)
{
struct usbhs_pipe *pos, *pipe;
int i;
/*
* find target pipe
*/
pipe = NULL;
usbhs_for_each_pipe_with_dcp(pos, priv, i) {
if (!usbhs_pipe_type_is(pos, type))
continue;
if (usbhsp_flags_has(pos, IS_USED))
continue;
pipe = pos;
break;
}
if (!pipe)
return NULL;
/*
* initialize pipe flags
*/
usbhsp_flags_init(pipe);
usbhsp_flags_set(pipe, IS_USED);
return pipe;
}
void usbhs_pipe_init(struct usbhs_priv *priv,
int (*dma_map_ctrl)(struct usbhs_pkt *pkt, int map))
{
struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
struct usbhs_pipe *pipe;
int i;
/*
* FIXME
*
* driver needs good allocator.
*
* find first free buffer area (BULK, ISOC)
* (DCP, INT area is fixed)
*
* buffer number 0 - 3 have been reserved for DCP
* see
* usbhsp_to_bufnmb
*/
info->bufnmb_last = 4;
usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
if (usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_INT))
info->bufnmb_last++;
usbhsp_flags_init(pipe);
pipe->fifo = NULL;
pipe->mod_private = NULL;
INIT_LIST_HEAD(&pipe->list);
/* pipe force init */
usbhs_pipe_clear(pipe);
}
info->dma_map_ctrl = dma_map_ctrl;
}
struct usbhs_pipe *usbhs_pipe_malloc(struct usbhs_priv *priv,
int endpoint_type,
int dir_in)
{
struct device *dev = usbhs_priv_to_dev(priv);
struct usbhs_pipe *pipe;
int is_host = usbhs_mod_is_host(priv);
int ret;
u16 pipecfg, pipebuf;
pipe = usbhsp_get_pipe(priv, endpoint_type);
if (!pipe) {
dev_err(dev, "can't get pipe (%s)\n",
usbhsp_pipe_name[endpoint_type]);
return NULL;
}
INIT_LIST_HEAD(&pipe->list);
usbhs_pipe_disable(pipe);
/* make sure pipe is not busy */
ret = usbhsp_pipe_barrier(pipe);
if (ret < 0) {
dev_err(dev, "pipe setup failed %d\n", usbhs_pipe_number(pipe));
return NULL;
}
pipecfg = usbhsp_setup_pipecfg(pipe, is_host, dir_in);
pipebuf = usbhsp_setup_pipebuff(pipe);
usbhsp_pipe_select(pipe);
usbhsp_pipe_cfg_set(pipe, 0xFFFF, pipecfg);
usbhsp_pipe_buf_set(pipe, 0xFFFF, pipebuf);
usbhs_pipe_sequence_data0(pipe);
dev_dbg(dev, "enable pipe %d : %s (%s)\n",
usbhs_pipe_number(pipe),
usbhs_pipe_name(pipe),
usbhs_pipe_is_dir_in(pipe) ? "in" : "out");
/*
* epnum / maxp are still not set to this pipe.
* call usbhs_pipe_config_update() after this function !!
*/
return pipe;
}
void usbhs_pipe_select_fifo(struct usbhs_pipe *pipe, struct usbhs_fifo *fifo)
{
if (pipe->fifo)
pipe->fifo->pipe = NULL;
pipe->fifo = fifo;
if (fifo)
fifo->pipe = pipe;
}
/*
* dcp control
*/
struct usbhs_pipe *usbhs_dcp_malloc(struct usbhs_priv *priv)
{
struct usbhs_pipe *pipe;
pipe = usbhsp_get_pipe(priv, USB_ENDPOINT_XFER_CONTROL);
if (!pipe)
return NULL;
INIT_LIST_HEAD(&pipe->list);
/*
* call usbhs_pipe_config_update() after this function !!
*/
return pipe;
}
void usbhs_dcp_control_transfer_done(struct usbhs_pipe *pipe)
{
struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
WARN_ON(!usbhs_pipe_is_dcp(pipe));
usbhs_pipe_enable(pipe);
if (!usbhs_mod_is_host(priv)) /* funconly */
usbhsp_pipectrl_set(pipe, CCPL, CCPL);
}
void usbhs_dcp_dir_for_host(struct usbhs_pipe *pipe, int dir_out)
{
usbhsp_pipe_cfg_set(pipe, DIR_OUT,
dir_out ? DIR_OUT : 0);
}
/*
* pipe module function
*/
int usbhs_pipe_probe(struct usbhs_priv *priv)
{
struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
struct usbhs_pipe *pipe;
struct device *dev = usbhs_priv_to_dev(priv);
u32 *pipe_type = usbhs_get_dparam(priv, pipe_type);
int pipe_size = usbhs_get_dparam(priv, pipe_size);
int i;
/* This driver expects 1st pipe is DCP */
if (pipe_type[0] != USB_ENDPOINT_XFER_CONTROL) {
dev_err(dev, "1st PIPE is not DCP\n");
return -EINVAL;
}
info->pipe = kzalloc(sizeof(struct usbhs_pipe) * pipe_size, GFP_KERNEL);
if (!info->pipe) {
dev_err(dev, "Could not allocate pipe\n");
return -ENOMEM;
}
info->size = pipe_size;
/*
* init pipe
*/
usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
pipe->priv = priv;
usbhs_pipe_type(pipe) =
pipe_type[i] & USB_ENDPOINT_XFERTYPE_MASK;
dev_dbg(dev, "pipe %x\t: %s\n",
i, usbhsp_pipe_name[pipe_type[i]]);
}
return 0;
}
void usbhs_pipe_remove(struct usbhs_priv *priv)
{
struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
kfree(info->pipe);
}
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