Hi, On Saturday 14 March 2009, Grant Grundler wrote: > On Fri, Feb 20, 2009 at 6:12 PM, Bartlomiej Zolnierkiewicz > <bzolnier@xxxxxxxxx> wrote: > > From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx> > > Subject: [PATCH] ide: destroy DMA mappings after ending DMA > > > > Move ide_destroy_dmatable() call out from ->dma_end method to > > {ide_pc,cdrom_newpc,ide_dma}_intr(), ide_dma_timeout_retry() > > and sgiioc4_resetproc(). > ... > > --- a/drivers/ide/ide-dma-sff.c > > +++ b/drivers/ide/ide-dma-sff.c > > @@ -310,8 +310,6 @@ int ide_dma_end(ide_drive_t *drive) > > /* clear INTR & ERROR bits */ > > ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR); > > > > - /* purge DMA mappings */ > > - ide_destroy_dmatable(drive); > > wmb(); > > Bartlomiej, > I think the wmb() could removed as well. The outb/writeb functions are > required to be strongly ordered and I don't see anything else touching > DMA-able memory here. Indeed. IIRC this code precedes the requeirement for outb/writeb to be strongly ordered. Seems like wmb() in ide_dma_start() is also superfluous nowadays... > BTW, care to remove "mask" usage from this function? > It's really not needed (can be replaced with #define). Feel free to remove it. :) > I can create separate patches for both. Which git tree should I base > them against? linux-next git tree (or pata-2.6 quilt tree) > ... > > --- a/drivers/ide/scc_pata.c > > +++ b/drivers/ide/scc_pata.c > > @@ -365,8 +365,6 @@ static int __scc_dma_end(ide_drive_t *dr > > dma_stat = scc_dma_sff_read_status(hwif); > > /* clear the INTR & ERROR bits */ > > scc_ide_outb(dma_stat | 6, hwif->dma_base + 4); > > - /* purge DMA mappings */ > > - ide_destroy_dmatable(drive); > > /* verify good DMA status */ > > wmb(); > > I think this wmb() can be removed too. > > .... > > --- a/drivers/ide/tx4939ide.c > > +++ b/drivers/ide/tx4939ide.c > > @@ -335,11 +335,9 @@ static int tx4939ide_dma_end(ide_drive_t > > /* read and clear the INTR & ERROR bits */ > > dma_stat = tx4939ide_clear_dma_status(base); > > > > - /* purge DMA mappings */ > > - ide_destroy_dmatable(drive); > > - /* verify good DMA status */ > > wmb(); > > and this one as well. Seems so but please cc: scc_pata & tx4939 maintainers on your patch. Thanks, Bart -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html