linux-kernel - [PATCH v2 32/41] media: atomisp: don't cause a warn if probe failed

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Date:   Sat, 30 May 2020 08:55:49 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 32/41] media: atomisp: don't cause a warn if probe failed

When probe fails, it is possible that hmm_init() to not be
called. On such case, hmm_cleanup() will cause a WARN_ON().

Avoid it by adding an explicit check at hmm_cleanup() to
ensure that the hmm code was properly initialized.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/staging/media/atomisp/pci/hmm/hmm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/media/atomisp/pci/hmm/hmm.c b/drivers/staging/media/atomisp/pci/hmm/hmm.c
index c8a6e2d6e498..670382c48034 100644
--- a/drivers/staging/media/atomisp/pci/hmm/hmm.c
+++ b/drivers/staging/media/atomisp/pci/hmm/hmm.c
@@ -208,6 +208,8 @@ int hmm_init(void)
 
 void hmm_cleanup(void)
 {
+	if (!dummy_ptr)
+		return;
 	sysfs_remove_group(&atomisp_dev->kobj, atomisp_attribute_group);
 
 	/* free dummy memory first */
-- 
2.26.2