dfu: add write error handling
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>
diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index dab5e70..1bf66d0 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -147,6 +147,19 @@
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 @@
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 @@
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 @@
/* 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 @@
/* 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)