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authorStephen Warren <swarren@nvidia.com>2014-06-11 12:48:08 -0600
committerTom Rini <trini@ti.com>2014-08-09 11:16:58 -0400
commit3ee9593fce0b58124e667734d7bc8d44b11a7be2 (patch)
treef47521946be94b9ba599c30abdc85f88916d8ca4 /drivers/usb
parent0e285b503c41bb53f6ef962e6f9c942c1ca47cc6 (diff)
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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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/f_dfu.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
index 859fe82..9863dec 100644
--- a/drivers/usb/gadget/f_dfu.c
+++ b/drivers/usb/gadget/f_dfu.c
@@ -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;
}