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i2c: tiny-usb: do not use stack as URB transfer_buffer 

Patch fixes i2c-tiny-usb not to use stack as URB transfer_buffer. URB buffers
need to be DMA-able, which stack is not.

Patch is only compile tested.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jussi Kivilinna 2013-08-06 14:17:42 +03:00 committed by Wolfram Sang
parent 6d4028c644
commit 243ec0909a
1 changed files with 34 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/i2c/busses/i2c-tiny-usb.c
View File

@ -54,12 +54,16 @@ static int usb_write(struct i2c_adapter *adapter, int cmd,
static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
{
unsigned char status;
unsigned char *pstatus;
struct i2c_msg *pmsg;
int i;
int i, ret;
dev_dbg(&adapter->dev, "master xfer %d messages:\n", num);
pstatus = kmalloc(sizeof(*pstatus), GFP_KERNEL);
if (!pstatus)
return -ENOMEM;
for (i = 0 ; i < num ; i++) {
int cmd = CMD_I2C_IO;
@ -84,7 +88,8 @@ static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
pmsg->buf, pmsg->len) != pmsg->len) {
dev_err(&adapter->dev,
"failure reading data\n");
return -EREMOTEIO;
ret = -EREMOTEIO;
goto out;
}
} else {
/* write data */
@ -93,36 +98,50 @@ static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
pmsg->buf, pmsg->len) != pmsg->len) {
dev_err(&adapter->dev,
"failure writing data\n");
return -EREMOTEIO;
ret = -EREMOTEIO;
goto out;
}
}
/* read status */
if (usb_read(adapter, CMD_GET_STATUS, 0, 0, &status, 1) != 1) {
if (usb_read(adapter, CMD_GET_STATUS, 0, 0, pstatus, 1) != 1) {
dev_err(&adapter->dev, "failure reading status\n");
return -EREMOTEIO;
ret = -EREMOTEIO;
goto out;
}
dev_dbg(&adapter->dev, " status = %d\n", status);
if (status == STATUS_ADDRESS_NAK)
return -EREMOTEIO;
dev_dbg(&adapter->dev, " status = %d\n", *pstatus);
if (*pstatus == STATUS_ADDRESS_NAK) {
ret = -EREMOTEIO;
goto out;
}
}
return i;
ret = i;
out:
kfree(pstatus);
return ret;
}
static u32 usb_func(struct i2c_adapter *adapter)
{
__le32 func;
__le32 *pfunc;
u32 ret;
pfunc = kmalloc(sizeof(*pfunc), GFP_KERNEL);
/* get functionality from adapter */
if (usb_read(adapter, CMD_GET_FUNC, 0, 0, &func, sizeof(func)) !=
sizeof(func)) {
if (!pfunc || usb_read(adapter, CMD_GET_FUNC, 0, 0, pfunc,
sizeof(*pfunc)) != sizeof(*pfunc)) {
dev_err(&adapter->dev, "failure reading functionality\n");
return 0;
ret = 0;
goto out;
}
return le32_to_cpu(func);
ret = le32_to_cpup(pfunc);
out:
kfree(pfunc);
return ret;
}
/* This is the actual algorithm we define */