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libata: ata_dev_disable() should be called from EH context 

ata_port_detach() calls ata_dev_disable() with host lock held but
ata_dev_disable() should be called from EH context.  ata_port_detach()
steals EH context by setting ATA_PFLAG_UNLOADAING and flushing EH.
Drop locking around ata_dev_disable() and note that ata_port_detach()
owns EH context at that point.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-12-15 15:05:00 +09:00 committed by Jeff Garzik
parent ce2e0abbd3
commit 7f9ad9b8b9
1 changed files with 2 additions and 6 deletions
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8
drivers/ata/libata-core.c
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@ -7210,18 +7210,14 @@ static void ata_port_detach(struct ata_port *ap)
ata_port_wait_eh(ap);
/* EH is now guaranteed to see UNLOADING, so no new device
* will be attached. Disable all existing devices.
/* EH is now guaranteed to see UNLOADING - EH context belongs
* to us. Disable all existing devices.
*/
spin_lock_irqsave(ap->lock, flags);
ata_port_for_each_link(link, ap) {
ata_link_for_each_dev(dev, link)
ata_dev_disable(dev);
}
spin_unlock_irqrestore(ap->lock, flags);
/* Final freeze & EH. All in-flight commands are aborted. EH
* will be skipped and retrials will be terminated with bad
* target.