diff options
author | Paul Brook <paul@nowt.org> | 2014-03-20 22:44:41 +0000 |
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committer | Cristian Maglie <c.maglie@bug.st> | 2014-05-24 00:34:56 +0200 |
commit | b57b2ae3c163a855efca331bf817d566e328f88b (patch) | |
tree | d5a8415cbe0d0ff2a36b772eaec928a6846f15c5 /firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/COMPONENTS/MEMORY | |
parent | 872c88bb5f643702edcc8d0ebfc1f6cd13bcf414 (diff) |
Fix race condition in USB CDC transmit
If the Start of Frame interrupt triggers just after the call
to USB_SendSpace in USB_Send then we can get data loss.
When the first bank is full and the second partially full,
the SOF handler will release the second bank via USB_Flush.
Data is then lost due to overflow as USB_Send continues writing data
to the now-closed bank.
Fix this by re-checking the FIFO status inside LockEP, immediately before
doing the data write.
Signed-off-by: Paul Brook <paul@nowt.org>
Diffstat (limited to 'firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/COMPONENTS/MEMORY')
0 files changed, 0 insertions, 0 deletions