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[PATCH] libata: make sure sdev doesn't go away while rescanning 

ata_scsi_dev_rescan() doesn't synchronize against SCSI device detach
and the target sdev might go away in the middle.  Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2006-11-22 11:21:31 +09:00
parent a569a30d30
commit f84e7e41e1
1 changed files with 17 additions and 5 deletions
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22
drivers/ata/libata-scsi.c
View File

@ -3181,15 +3181,27 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
void ata_scsi_dev_rescan(void *data)
{
struct ata_port *ap = data;
struct ata_device *dev;
unsigned long flags;
unsigned int i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
dev = &ap->device[i];
spin_lock_irqsave(ap->lock, flags);
if (ata_dev_enabled(dev) && dev->sdev)
scsi_rescan_device(&(dev->sdev->sdev_gendev));
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
struct scsi_device *sdev = dev->sdev;
if (!ata_dev_enabled(dev) || !sdev)
continue;
if (scsi_device_get(sdev))
continue;
spin_unlock_irqrestore(ap->lock, flags);
scsi_rescan_device(&(sdev->sdev_gendev));
scsi_device_put(sdev);
spin_lock_irqsave(ap->lock, flags);
}
spin_unlock_irqrestore(ap->lock, flags);
}
/**