Ooops, I think it will not work properly for the long ran as there is no
lock to serialize access to that buffer early enough.
I have to rethink whole situation and maybe try to move "usb_mutex" from
the dvb_usbv2_generic_rw() to the device driver. Or add totally new mutex.
regards
Antti
On 02/25/2013 01:39 AM, Antti Palosaari wrote:
WARNING: at lib/dma-debug.c:947 check_for_stack+0xa7/0xf0()
ehci-pci 0000:00:04.1: DMA-API: device driver maps memory fromstack
Reported-by: poma <pomidorabelisima@xxxxxxxxx>
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/usb/dvb-usb-v2/af9015.c | 34 ++++++++++++++++------------------
drivers/media/usb/dvb-usb-v2/af9015.h | 2 ++
2 files changed, 18 insertions(+), 18 deletions(-)
diff --git a/drivers/media/usb/dvb-usb-v2/af9015.c b/drivers/media/usb/dvb-usb-v2/af9015.c
index b86d0f2..28983aa 100644
--- a/drivers/media/usb/dvb-usb-v2/af9015.c
+++ b/drivers/media/usb/dvb-usb-v2/af9015.c
@@ -30,22 +30,20 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
static int af9015_ctrl_msg(struct dvb_usb_device *d, struct req_t *req)
{
-#define BUF_LEN 63
#define REQ_HDR_LEN 8 /* send header size */
#define ACK_HDR_LEN 2 /* rece header size */
struct af9015_state *state = d_to_priv(d);
int ret, wlen, rlen;
- u8 buf[BUF_LEN];
u8 write = 1;
- buf[0] = req->cmd;
- buf[1] = state->seq++;
- buf[2] = req->i2c_addr;
- buf[3] = req->addr >> 8;
- buf[4] = req->addr & 0xff;
- buf[5] = req->mbox;
- buf[6] = req->addr_len;
- buf[7] = req->data_len;
+ state->buf[0] = req->cmd;
+ state->buf[1] = state->seq++;
+ state->buf[2] = req->i2c_addr;
+ state->buf[3] = req->addr >> 8;
+ state->buf[4] = req->addr & 0xff;
+ state->buf[5] = req->mbox;
+ state->buf[6] = req->addr_len;
+ state->buf[7] = req->data_len;
switch (req->cmd) {
case GET_CONFIG:
@@ -55,14 +53,14 @@ static int af9015_ctrl_msg(struct dvb_usb_device *d, struct req_t *req)
break;
case READ_I2C:
write = 0;
- buf[2] |= 0x01; /* set I2C direction */
+ state->buf[2] |= 0x01; /* set I2C direction */
case WRITE_I2C:
- buf[0] = READ_WRITE_I2C;
+ state->buf[0] = READ_WRITE_I2C;
break;
case WRITE_MEMORY:
if (((req->addr & 0xff00) == 0xff00) ||
((req->addr & 0xff00) == 0xae00))
- buf[0] = WRITE_VIRTUAL_MEMORY;
+ state->buf[0] = WRITE_VIRTUAL_MEMORY;
case WRITE_VIRTUAL_MEMORY:
case COPY_FIRMWARE:
case DOWNLOAD_FIRMWARE:
@@ -90,7 +88,7 @@ static int af9015_ctrl_msg(struct dvb_usb_device *d, struct req_t *req)
rlen = ACK_HDR_LEN;
if (write) {
wlen += req->data_len;
- memcpy(&buf[REQ_HDR_LEN], req->data, req->data_len);
+ memcpy(&state->buf[REQ_HDR_LEN], req->data, req->data_len);
} else {
rlen += req->data_len;
}
@@ -99,21 +97,21 @@ static int af9015_ctrl_msg(struct dvb_usb_device *d, struct req_t *req)
if (req->cmd == DOWNLOAD_FIRMWARE || req->cmd == RECONNECT_USB)
rlen = 0;
- ret = dvb_usbv2_generic_rw(d, buf, wlen, buf, rlen);
+ ret = dvb_usbv2_generic_rw(d, state->buf, wlen, state->buf, rlen);
if (ret)
goto error;
/* check status */
- if (rlen && buf[1]) {
+ if (rlen && state->buf[1]) {
dev_err(&d->udev->dev, "%s: command failed=%d\n",
- KBUILD_MODNAME, buf[1]);
+ KBUILD_MODNAME, state->buf[1]);
ret = -EIO;
goto error;
}
/* read request, copy returned data to return buf */
if (!write)
- memcpy(req->data, &buf[ACK_HDR_LEN], req->data_len);
+ memcpy(req->data, &state->buf[ACK_HDR_LEN], req->data_len);
error:
return ret;
}
diff --git a/drivers/media/usb/dvb-usb-v2/af9015.h b/drivers/media/usb/dvb-usb-v2/af9015.h
index 533637d..3a6f3ad 100644
--- a/drivers/media/usb/dvb-usb-v2/af9015.h
+++ b/drivers/media/usb/dvb-usb-v2/af9015.h
@@ -115,7 +115,9 @@ enum af9015_ir_mode {
AF9015_IR_MODE_POLLING, /* just guess */
};
+#define BUF_LEN 63
struct af9015_state {
+ u8 buf[BUF_LEN]; /* bulk USB control message */
u8 ir_mode;
u8 rc_repeat;
u32 rc_keycode;
--
http://palosaari.fi/
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