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SCSI was using module_refcount() to figure out when the module was

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unloading: this broke with new atomic refcounting.  The code is still
 suspicious, but this solves the WARN_ON().
 
 Thanks,
 Rusty.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull one more module fix from Rusty Russell:
 "SCSI was using module_refcount() to figure out when the module was
  unloading: this broke with new atomic refcounting.  The code is still
  suspicious, but this solves the WARN_ON()"

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  scsi: always increment reference count
This commit is contained in:
Linus Torvalds 2015-01-27 09:02:09 -08:00
commit 41592e2fb5
1 changed files with 3 additions and 10 deletions
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13
drivers/scsi/scsi.c
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@ -986,9 +986,9 @@ int scsi_device_get(struct scsi_device *sdev)
return -ENXIO;
if (!get_device(&sdev->sdev_gendev))
return -ENXIO;
/* We can fail this if we're doing SCSI operations
/* We can fail try_module_get if we're doing SCSI operations
* from module exit (like cache flush) */
try_module_get(sdev->host->hostt->module);
__module_get(sdev->host->hostt->module);
return 0;
}
@ -1004,14 +1004,7 @@ EXPORT_SYMBOL(scsi_device_get);
*/
void scsi_device_put(struct scsi_device *sdev)
{
#ifdef CONFIG_MODULE_UNLOAD
struct module *module = sdev->host->hostt->module;
/* The module refcount will be zero if scsi_device_get()
* was called from a module removal routine */
if (module && module_refcount(module) != 0)
module_put(module);
#endif
module_put(sdev->host->hostt->module);
put_device(&sdev->sdev_gendev);
}
EXPORT_SYMBOL(scsi_device_put);