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-rw-r--r--drivers/scsi/scsi.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 94df671d776..37843927e47 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -851,14 +851,14 @@ EXPORT_SYMBOL(scsi_track_queue_full);
*/
int scsi_device_get(struct scsi_device *sdev)
{
- if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
+ if (sdev->sdev_state == SDEV_DEL)
return -ENXIO;
if (!get_device(&sdev->sdev_gendev))
return -ENXIO;
- if (!try_module_get(sdev->host->hostt->module)) {
- put_device(&sdev->sdev_gendev);
- return -ENXIO;
- }
+ /* We can fail this if we're doing SCSI operations
+ * from module exit (like cache flush) */
+ try_module_get(sdev->host->hostt->module);
+
return 0;
}
EXPORT_SYMBOL(scsi_device_get);
@@ -873,7 +873,10 @@ EXPORT_SYMBOL(scsi_device_get);
*/
void scsi_device_put(struct scsi_device *sdev)
{
- module_put(sdev->host->hostt->module);
+ /* The module refcount will be zero if scsi_device_get()
+ * was called from a module removal routine */
+ if (likely(module_refcount(sdev->host->hostt->module) != 0))
+ module_put(sdev->host->hostt->module);
put_device(&sdev->sdev_gendev);
}
EXPORT_SYMBOL(scsi_device_put);