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 <htejun@xxxxxxxxx> Cc: Robert Hancock <hancockr@xxxxxxx> --- 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(-)
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