Alan Cox wrote:
diff -uprdN linux/drivers/ata/libata-core.c linux/drivers/ata/libata-core.c --- linux/drivers/ata/libata-core.c 2007-03-07 22:13:24.000000000 -0800 +++ linux/drivers/ata/libata-core.c 2007-03-08 00:15:37.000000000 -0800 @@ -3455,7 +3455,8 @@ static void ata_dev_xfermask(struct ata_ "device is on DMA blacklist, disabling DMA\n"); }- if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed != ap) {+ if ((host->flags & ATA_HOST_SIMPLEX) && + host->simplex_claimed && host->simplex_claimed != ap) {
A different version of this fix just went upstream for 2.6.21 via Jeff. Which of the two is correct? I believe the other one looks like this:
- if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed != ap) { - if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed == ap) {
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