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sysclk-lwla: Utility functions clean-up and semantic fixes. 

(lwla_send_bitstream): Unref the mapped file earlier in order
to simplify the error handling.
(lwla_receive_reply): Do not treat a reply buffer length of
zero as silent no-op.  That logic was left over from an earlier
iteration, before the distinction between reply buffer size and
expected read length was introduced.
This commit is contained in:
Daniel Elstner 2014-01-15 01:12:39 +01:00
parent 60e2fa0a03
commit 313c7a7da2
1 changed files with 9 additions and 11 deletions
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20
hardware/sysclk-lwla/lwla.c
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@ -58,19 +58,18 @@ SR_PRIV int lwla_send_bitstream(const struct sr_usb_dev_inst *usb,
ret = libusb_bulk_transfer(usb->devhdl, EP_BITSTREAM,
(unsigned char *)stream, length,
&xfer_len, USB_TIMEOUT);
g_mapped_file_unref(file);
if (ret != 0) {
sr_err("Failed to transfer bitstream: %s.",
libusb_error_name(ret));
g_mapped_file_unref(file);
return SR_ERR;
}
if (xfer_len != (int)length) {
sr_err("Failed to transfer bitstream: incorrect length "
"%d != %d.", xfer_len, (int)length);
g_mapped_file_unref(file);
return SR_ERR;
}
g_mapped_file_unref(file);
sr_info("FPGA bitstream download of %d bytes done.", xfer_len);
/* This delay appears to be necessary for reliable operation. */
@ -83,11 +82,12 @@ SR_PRIV int lwla_send_command(const struct sr_usb_dev_inst *usb,
const uint16_t *command, int cmd_len)
{
int ret;
int xfer_len = 0;
int xfer_len;
if (usb == NULL || command == NULL || cmd_len < 1)
if (usb == NULL || command == NULL || cmd_len <= 0)
return SR_ERR_ARG;
xfer_len = 0;
ret = libusb_bulk_transfer(usb->devhdl, EP_COMMAND,
(unsigned char *)command, cmd_len * 2,
&xfer_len, USB_TIMEOUT);
@ -108,14 +108,12 @@ SR_PRIV int lwla_receive_reply(const struct sr_usb_dev_inst *usb,
uint16_t *reply, int reply_len, int expect_len)
{
int ret;
int xfer_len = 0;
int xfer_len;
if (reply_len == 0)
return SR_OK;
if (usb == NULL || reply == NULL || reply_len < 0)
if (usb == NULL || reply == NULL || reply_len <= 0)
return SR_ERR_ARG;
xfer_len = 0;
ret = libusb_bulk_transfer(usb->devhdl, EP_REPLY,
(unsigned char *)reply, reply_len * 2,
&xfer_len, USB_TIMEOUT);
@ -136,7 +134,7 @@ SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb,
{
int ret;
uint16_t command[2];
uint16_t reply[256];
uint16_t reply[256]; /* full EP buffer to avoid overflows */
command[0] = LWLA_WORD(CMD_READ_REG);
command[1] = LWLA_WORD(reg);