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| author | Rusty Russell <rusty@rustcorp.com.au> | 2015-01-23 05:52:47 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-01-23 07:12:16 +0300 |
| commit | dc4515ea26d6c7fed3d978cd2bd36adc0d057bc5 (patch) | |
| tree | 5af9b7e384ae01cacea65f9a85cee4967fd2d494 | |
| parent | d5db139ab3764640e0882a1746e7b9fdee33fd87 (diff) | |
| download | linux-dc4515ea26d6c7fed3d978cd2bd36adc0d057bc5.tar.xz | |
scsi: always increment reference count
James reported:
> After e513cc1 module: Remove stop_machine from module unloading,
> module_refcount() is returning (unsigned long)-1 when called from within
> a routine that runs in module_exit. This is confusing the scsi device
> put code which is coded to detect a module_refcount() of zero for
> running within a module exit routine and not try to do another
> module_put. The fix is to restore the original behaviour of
> module_refcount() and return zero if we're running inside an exit
> routine.
The correct fix is to turn try_module_get() into __module_get(), and
always do the module_put().
Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | drivers/scsi/scsi.c | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index e02885451425..9b3829931f40 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -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); |