On 2015-08-01 17:54, Mark Cave-Ayland wrote:
> The existing code incorrectly changes the dma_active flag when a non-block
> transfer has completed leading to a hang on newer versions of Linux because
> the
> IDE and DMA engines deadlock waiting for each other.
>
> Instead copy the buffer directly to RAM, set the remaining transfer size to 0
> and
> then invoke the ATAPI callback manually once again to correctly finish the
> transfer in an identical manner to a block transfer.
>
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
> ---
Thanks for the patch, it improves things here. I don't get messages
anymore, and I get less messages when mounting the CD-ROM, though I
still get one:
[ 307.258463] pata-macio 0.00021000:ata-4: timeout flushing DMA
[ 307.262856] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 307.262919] ata2.00: BMDMA stat 0x6
[ 307.263048] sr 1:0:0:0: CDB: Get configuration: 46 00 00 28 00 00 00 00 10
00
[ 307.263289] ata2.00: cmd a0/01:00:00:10:00/00:00:00:00:00/a0 tag 0 dma
16400 in
[ 307.263297] res 41/50:03:00:10:00/00:00:00:00:00/a0 Emask 0x20
(host bus error)
[ 307.263407] ata2.00: status: { DRDY ERR }
[ 307.271251] ata2.00: configured for MWDMA2
[ 307.271824] ata2: EH complete
The CD-ROM is fully functional though.
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurel...@aurel32.net http://www.aurel32.net
