BestComm BD tasks, buffer done flag question

[Roman Fietze]

Hello,

I'm using Grant's platform SCLPC/BestComm driver to transfer data from
an FPGA (to disk). Very often I get a negative result from
bcom_buffer_done because BCOM_BD_READY is not set.

When searching for a solution I found this mail from Rob Broersen
talking about a similar promlem in the MPC5200's FEC interrupt
handler:

http://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg16324.html

When I now do something ugly like

	if (!bcom_buffer_done(lpbfifo->bcom_cur_task))
		mdelay(1);

	/* retry */
	if (!bcom_buffer_done(lpbfifo->bcom_cur_task)) {
		ERROR!!!
		return IRQ_HANDLED;
	}

	HANDLE BD

in the ISR I always succeed, even in the cases where the first check
fails and I call the mdelay. Before that I very often ran into the
ERROR!!! case and my transfer "failed".

Is there a better solution? Does the FEC interrupt handler really work
fine as it is right now? I ask, because when I assume that there would
be just one active DB (as it always is with the SCLPC platform driver)
this one would evt. stall if there wasn't a second interrupt causing
the loop to handle it in this second interrupt.


Roman

-- 
Roman Fietze                Telemotive AG Büro Mühlhausen
Breitwiesen                              73347 Mühlhausen
Tel.: +49(0)7335/18493-45        http://www.telemotive.de