Tejun Heo wrote:
After non-classifying reset, ehc->classes[] could contain
ATA_DEV_UNKNOWN which used to be normalized to ATA_DEV_NONE for
consistency. However, this causes unfortunate side effect for drivers
which have non-classifying hardresets (e.g. sata_nv) by making
hardreset report ATA_DEV_NONE for non-classifying resets and thus
makes EH believe that the port is unoccupied and recovery can be
skipped. The end result is that after a device is swapped with
another one, the new device isn't attached after the old one is
detached.
This patch makes ata_eh_reset() not normalize UNKNOWN to NONE after
non-classifying resets. This fixes the above problem. As UNKNOWN and
NONE are handled differently by only EH hotplug logic, this doesn't
cause other behavior changes.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Cc: Robert Hancock <[EMAIL PROTECTED]>
---
Robert, missing new device was a bug in core EH logic not sata_nv.
BTW, I did quite a few hotplug tests with adma=0 and it works just
fine. No lock up.
drivers/ata/libata-eh.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
applied
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