The following commit has been merged in the linux branch: commit 4f7c2874995ac48a4622755b8bd159eb2fb6d8f4 Author: Tejun Heo tj@kernel.org Date: Thu Oct 15 23:37:32 2009 +0900
libata: fix PMP initialization
Commit 842faa6c1a1d6faddf3377948e5cf214812c6c90 fixed error handling during attach by not committing detected device class to dev->class while attaching a new device. However, this change missed the PMP class check in the configuration loop causing a new PMP device to go through ata_dev_configure() as if it were an ATA or ATAPI device.
As PMP device doesn't have a regular IDENTIFY data, this makes ata_dev_configure() tries to configure a PMP device using an invalid data. For the most part, it wasn't too harmful and went unnoticed but this ends up clearing dev->flags which may have ATA_DFLAG_AN set by sata_pmp_attach(). This means that SATA_PMP_FEAT_NOTIFY ends up being disabled on PMPs and on PMPs which honor the flag breaks hotplug support.
This problem was discovered and reported by Ethan Hsiao.
Signed-off-by: Tejun Heo tj@kernel.org Reported-by: Ethan Hsiao ethanhsiao@jmicron.com Cc: stable@kernel.org Signed-off-by: Jeff Garzik jgarzik@redhat.com
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 0a97822..bba2ae5 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2981,12 +2981,14 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link, * device detection messages backwards. */ ata_for_each_dev(dev, link, ALL) { - if (!(new_mask & (1 << dev->devno)) || - dev->class == ATA_DEV_PMP) + if (!(new_mask & (1 << dev->devno))) continue;
dev->class = ehc->classes[dev->devno];
+ if (dev->class == ATA_DEV_PMP) + continue; + ehc->i.flags |= ATA_EHI_PRINTINFO; rc = ata_dev_configure(dev); ehc->i.flags &= ~ATA_EHI_PRINTINFO;