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scsi: serialize ->rescan against ->remove

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Lock the device embedded in the scsi_device to protect against
concurrent calls to ->remove.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Christoph Hellwig 2015-02-02 14:01:24 +01:00 committed by James Bottomley
parent 4e5a800c82
commit e27829dc92
1 changed files with 3 additions and 4 deletions
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7
drivers/scsi/scsi_scan.c
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@ -1570,16 +1570,15 @@ EXPORT_SYMBOL(scsi_add_device);
void scsi_rescan_device(struct device *dev) void scsi_rescan_device(struct device *dev)
{ {
if (!dev->driver) device_lock(dev);
return; if (dev->driver && try_module_get(dev->driver->owner)) {
if (try_module_get(dev->driver->owner)) {
struct scsi_driver *drv = to_scsi_driver(dev->driver); struct scsi_driver *drv = to_scsi_driver(dev->driver);
if (drv->rescan) if (drv->rescan)
drv->rescan(dev); drv->rescan(dev);
module_put(dev->driver->owner); module_put(dev->driver->owner);
} }
device_unlock(dev);
} }
EXPORT_SYMBOL(scsi_rescan_device); EXPORT_SYMBOL(scsi_rescan_device);