On 10-11-21 06:35 PM, Mark Lord wrote:
While working on something unrelated today, I instrumented ata_sff_data_xfer32() to generate a printk() on each invocation. Imagine then my complete surprise to see that print() being invoked very frequently after rebooting with the modified kernel. ata_sff_data_xfer32() is for PIO read/writes.. something that I don't expect to see. This is an ata_piix system, with a pure SATA SSD. Why are we using PIO so much? Or am I simply misunderstanding something basic here.. ? Confused.
Definitely just me being confused. :) I changed the printk() into an ata_dev_printk(), and discovered that all of those reads/writes are targeting the DVD-RW drive, not the SSD. So this is simply hald or something similar polling for disc-insertion, and PIO is used (as always) for the PACKET command transfer. Duh. :) -- 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
