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dfu: add write error handling

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Fix calls to dfu_write() and dfu_flush() to detect errors in the I/O
itself. This could happen due to problems with the storage medium, or
simply when trying to write a FAT/ext file that is larger than the buffer
dfu_mmc.c maintains for this purpose.

Signal the error by switching the DFU state/status. This will be picked
up by the DFU client when it sends the next DFU request. Note that errors
can't simply be returned from e.g. dnload_request_complete(), since that
function has no way to pass errors back to the DFU client; a call to
dnload_request_complete() simply means that a USB OUT completed.

This error state/status needs to be cleared when the next DFU client
connects. While there is a DFU_CLRSTATUS request, no DFU client seems to
send this. Hence, clear this when selecting the USB alternate setting on
the USB interface.

Finally, dfu.c relies on a call to dfu_flush() to clear up the internal
state of the write transaction. Now that errors in dfu_write() are
detected, dfu_flush() may no longer be called for every transaction.
Separate out the cleanup code into a new function, and call it whenever
dfu_write() fails, as well as from any call to dfu_flush().

Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2014-06-11 12:48:08 -06:00 committed by Tom Rini
parent 0e285b503c
commit 3ee9593fce
2 changed files with 44 additions and 22 deletions
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46
drivers/dfu/dfu.c
View file

@ -147,6 +147,19 @@ static int dfu_write_buffer_drain(struct dfu_entity *dfu)
return ret;
}
void dfu_write_transaction_cleanup(struct dfu_entity *dfu)
{
/* clear everything */
dfu_free_buf();
dfu->crc = 0;
dfu->offset = 0;
dfu->i_blk_seq_num = 0;
dfu->i_buf_start = dfu_buf;
dfu->i_buf_end = dfu_buf;
dfu->i_buf = dfu->i_buf_start;
dfu->inited = 0;
}
int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
{
int ret = 0;
@ -162,23 +175,14 @@ int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
dfu->crc);
/* clear everything */
dfu_free_buf();
dfu->crc = 0;
dfu->offset = 0;
dfu->i_blk_seq_num = 0;
dfu->i_buf_start = dfu_buf;
dfu->i_buf_end = dfu_buf;
dfu->i_buf = dfu->i_buf_start;
dfu->inited = 0;
dfu_write_transaction_cleanup(dfu);
return ret;
}
int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
{
int ret = 0;
int tret;
int ret;
debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n",
__func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
@ -202,6 +206,7 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
if (dfu->i_blk_seq_num != blk_seq_num) {
printf("%s: Wrong sequence number! [%d] [%d]\n",
__func__, dfu->i_blk_seq_num, blk_seq_num);
dfu_write_transaction_cleanup(dfu);
return -1;
}
@ -223,15 +228,18 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
/* flush buffer if overflow */
if ((dfu->i_buf + size) > dfu->i_buf_end) {
tret = dfu_write_buffer_drain(dfu);
if (ret == 0)
ret = tret;
ret = dfu_write_buffer_drain(dfu);
if (ret) {
dfu_write_transaction_cleanup(dfu);
return ret;
}
}
/* we should be in buffer now (if not then size too large) */
if ((dfu->i_buf + size) > dfu->i_buf_end) {
error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
size, dfu->i_buf_end);
dfu_write_transaction_cleanup(dfu);
return -1;
}
@ -240,12 +248,14 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
/* if end or if buffer full flush */
if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
tret = dfu_write_buffer_drain(dfu);
if (ret == 0)
ret = tret;
ret = dfu_write_buffer_drain(dfu);
if (ret) {
dfu_write_transaction_cleanup(dfu);
return ret;
}
}
return ret;
return 0;
}
static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)

20
drivers/usb/gadget/f_dfu.c
View file

@ -162,17 +162,27 @@ static void dfu_set_poll_timeout(struct dfu_status *dstat, unsigned int ms)
static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_dfu *f_dfu = req->context;
int ret;
dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf,
req->length, f_dfu->blk_seq_num);
ret = dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf,
req->length, f_dfu->blk_seq_num);
if (ret) {
f_dfu->dfu_status = DFU_STATUS_errUNKNOWN;
f_dfu->dfu_state = DFU_STATE_dfuERROR;
}
}
static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req)
{
struct f_dfu *f_dfu = req->context;
int ret;
dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf,
req->length, f_dfu->blk_seq_num);
ret = dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf,
req->length, f_dfu->blk_seq_num);
if (ret) {
f_dfu->dfu_status = DFU_STATUS_errUNKNOWN;
f_dfu->dfu_state = DFU_STATE_dfuERROR;
}
}
static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu)
@ -770,6 +780,8 @@ static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
debug("%s: intf:%d alt:%d\n", __func__, intf, alt);
f_dfu->altsetting = alt;
f_dfu->dfu_state = DFU_STATE_dfuIDLE;
f_dfu->dfu_status = DFU_STATUS_OK;
return 0;
}