2013/3/14 Rafał Miłecki <zajec5@xxxxxxxxx>: > 2013/3/14 Larry Finger <Larry.Finger@xxxxxxxxxxxx>: >> From: Iestyn C. Elfick <isedev@xxxxxxxxx> >> >> Intermittently, b43 will report "Out of order TX status report on DMA ring". >> When this happens, the driver must be reset before communication can resume. >> The cause of the problem is believed to be an error in the closed-source >> firmware; however, all versions of the firmware are affected. >> >> This change uses the observation that the expected status is always 2 less >> than the observed value, and supplies a fake status report to skip one >> header/data pair. >> >> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx> >> Cc: Stable <stable@xxxxxxxxxxxxxxx> >> --- >> >> Although this is a hack, it seems to work for the OP. It should not cause any >> ill effects on any device that does not have the problem. >> >> It does need a lot more testing, particularly on systems prone to the out-of-order >> status report problem. >> >> If anyone can think of a cleaner, less intrusive solution, please let us know. > > I wonder if this is hardware supporting unaligned access with > full-addressing for DMA engine. Maybe it support index-based indexes > for backward compatibility only, and it's somehow broken? > > Can we test full-addressing first? I'll try to prepare a patch for > this during the weekend. OK, so after early tests, this card doesn't support full-addressing at all. I'll give this patch a try during the weekend. -- Rafał -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
