Hello,
On 06/07/2010 06:34 AM, Robert Hancock wrote:
> I'm thinking that the hardreset and device classification makes more
> sense as a place to do this anyways, since that's the point where we
> really know if there's a device connected or not.. Tejun, any
> thoughts?
Heh, of course it doesn't work. Device presence can't be reliably
determined by sampling status once like that. We don't have all the
crap in libata-eh for nothing. :-)
Marc, can you please try the following patch?
Thanks.
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 1984a6e..261f86d 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -541,29 +541,11 @@ static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
return -EINVAL;
}
-static int ahci_is_device_present(void __iomem *port_mmio)
-{
- u8 status = readl(port_mmio + PORT_TFDATA) & 0xff;
-
- /* Make sure PxTFD.STS.BSY and PxTFD.STS.DRQ are 0 */
- if (status & (ATA_BUSY | ATA_DRQ))
- return 0;
-
- /* Make sure PxSSTS.DET is 3h */
- status = readl(port_mmio + PORT_SCR_STAT) & 0xf;
- if (status != 3)
- return 0;
- return 1;
-}
-
void ahci_start_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp;
- if (!ahci_is_device_present(port_mmio))
- return;
-
/* start DMA */
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_START;
@@ -1892,6 +1874,9 @@ static void ahci_error_handler(struct ata_port *ap)
}
sata_pmp_error_handler(ap);
+
+ if (!ata_dev_enabled(ap->link.device))
+ ahci_stop_engine(ap);
}
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
--
tejun
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