linux-kernel - [PATCH 02/21] drm/i915/gvt: remove module refcounting in intel_gvt_{,un}register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210721155355.173183-3-hch@lst.de>
Date:   Wed, 21 Jul 2021 17:53:36 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>
Cc:     intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/21] drm/i915/gvt: remove module refcounting in intel_gvt_{,un}register_hypervisor

THIS_MODULE always is reference when a symbol called by it is used, so
don't bother with the additional reference.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/gpu/drm/i915/gvt/gvt.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index cbac409f6c8a..6d7938aacca4 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -308,10 +308,6 @@ intel_gvt_register_hypervisor(const struct intel_gvt_mpt *m)
 	    m->type != INTEL_GVT_HYPERVISOR_XEN)
 		return -EINVAL;
 
-	/* Get a reference for device model module */
-	if (!try_module_get(THIS_MODULE))
-		return -ENODEV;
-
 	intel_gvt_host.mpt = m;
 	intel_gvt_host.hypervisor_type = m->type;
 	gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt;
@@ -321,7 +317,6 @@ intel_gvt_register_hypervisor(const struct intel_gvt_mpt *m)
 	if (ret < 0) {
 		gvt_err("Failed to init %s hypervisor module\n",
 			supported_hypervisors[intel_gvt_host.hypervisor_type]);
-		module_put(THIS_MODULE);
 		return -ENODEV;
 	}
 	gvt_dbg_core("Running with hypervisor %s in host mode\n",
@@ -335,6 +330,5 @@ intel_gvt_unregister_hypervisor(void)
 {
 	void *gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt;
 	intel_gvt_hypervisor_host_exit(intel_gvt_host.dev, gvt);
-	module_put(THIS_MODULE);
 }
 EXPORT_SYMBOL_GPL(intel_gvt_unregister_hypervisor);
-- 
2.30.2