On Mon, 28 Jan 2008 14:13:21 -0500 Gene Heskett <gene.heskett@xxxxxxxxx> wrote: > >> I had to reboot early this morning due to a freezeup, and I had a > >> bunch of these in the messages log: > >> ============== > >> Jan 27 19:42:11 coyote kernel: [42461.915961] ata1.00: exception Emask 0x0 > >> SAct 0x0 SErr 0x0 action 0x2 frozen Jan 27 19:42:11 coyote kernel: > >> [42461.915973] ata1.00: cmd ca/00:08:b1:66:46/00:00:00:00:00/e8 tag 0 dma > >> 4096 out Jan 27 19:42:11 coyote kernel: [42461.915974] res > >> 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout) Jan 27 19:42:11 > >> coyote kernel: [42461.915978] ata1.00: status: { DRDY } Jan 27 19:42:11 > >> coyote kernel: [42461.916005] ata1: soft resetting link Jan 27 19:42:12 > >> coyote kernel: [42462.078216] ata1.00: configured for UDMA/100 Jan 27 > >> 19:42:12 coyote kernel: [42462.078232] ata1: EH complete > >> Jan 27 19:42:12 coyote kernel: [42462.090700] sd 0:0:0:0: [sda] 390721968 > >> 512-byte hardware sectors (200050 MB) Jan 27 19:42:12 coyote kernel: > >> [42462.114230] sd 0:0:0:0: [sda] Write Protect is off Jan 27 19:42:12 > >> coyote kernel: [42462.115079] sd 0:0:0:0: [sda] Write cache: enabled, read > >> cache: enabled, doesn't support DPO or FUA > >> =============== I had this error too, or maybe only a similar one, and another, neither of which of i still have the error output laying around, so I'm posting both fixes, that i found here on lkml: 1) disabling ncq like that: "echo 1 > /sys/block/sda/device/queue_depth" 2) this patch: libata_drain_fifo_on_stuck_drq_hsm.patch ( applies to 2.6.24 too ) Signed-off-by: Mark Lord <mlord@xxxxxxxxx> --- --- old/drivers/ata/libata-sff.c 2007-09-28 09:29:22.000000000 -0400 +++ linux/drivers/ata/libata-sff.c 2007-09-28 09:39:44.000000000 -0400 @@ -420,6 +420,28 @@ ap->ops->irq_on(ap); } +static void ata_drain_fifo(struct ata_port *ap, struct ata_queued_cmd *qc) +{ + u8 stat = ata_chk_status(ap); + /* + * Try to clear stuck DRQ if necessary, + * by reading/discarding up to two sectors worth of data. + */ + if ((stat & ATA_DRQ) && (!qc || qc->dma_dir != DMA_TO_DEVICE)) { + unsigned int i; + unsigned int limit = qc ? qc->sect_size : ATA_SECT_SIZE; + + printk(KERN_WARNING "Draining up to %u words from data FIFO.\n", + limit); + for (i = 0; i < limit ; ++i) { + ioread16(ap->ioaddr.data_addr); + if (!(ata_chk_status(ap) & ATA_DRQ)) + break; + } + printk(KERN_WARNING "Drained %u/%u words.\n", i, limit); + } +} + /** * ata_bmdma_drive_eh - Perform EH with given methods for BMDMA controller * @ap: port to handle error for @@ -476,7 +498,7 @@ } ata_altstatus(ap); - ata_chk_status(ap); + ata_drain_fifo(ap, qc); ap->ops->irq_clear(ap); spin_unlock_irqrestore(ap->lock, flags); - -- Florian Attenberger <valdyn@xxxxxxxxx>
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