[PATCH] libata: improve ata_bus_probe()
Improve ata_bus_probe() such that configuration failures are handled
better. Each device is given ATA_PROBE_MAX_TRIES chances, but any
non-transient error (revalidation failure with -ENODEV, configuration
failure with -EINVAL...) disables the device directly. Any IO error
results in SATA PHY speed down and ata_set_mode() failure lowers
transfer mode. The last try always puts a device into PIO-0.
After each failure, the whole port is reset to make sure that the
controller and all the devices are in a known and stable state. The
reset also applies SATA SPD configuration if necessary.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index a5207e6..a4a1e63 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -211,6 +211,9 @@
/* Masks for port functions */
ATA_PORT_PRIMARY = (1 << 0),
ATA_PORT_SECONDARY = (1 << 1),
+
+ /* how hard are we gonna try to probe/recover devices */
+ ATA_PROBE_MAX_TRIES = 3,
};
enum hsm_task_states {