linux-kernel - [PATCH 5.9 679/757] PM: hibernate: remove the bogus call to get_gendisk() in software

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Date:   Tue, 27 Oct 2020 14:55:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 679/757] PM: hibernate: remove the bogus call to get_gendisk() in software_resume()

From: Christoph Hellwig <hch@....de>

[ Upstream commit 428805c0c5e76ef643b1fbc893edfb636b3d8aef ]

get_gendisk grabs a reference on the disk and file operation, so this
code will leak both of them while having absolutely no use for the
gendisk itself.

This effectively reverts commit 2df83fa4bce421f ("PM / Hibernate: Use
get_gendisk to verify partition if resume_file is integer format")

Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/power/hibernate.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 1dee70815f3cd..2fc7d509a34fc 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -946,17 +946,6 @@ static int software_resume(void)
 
 	/* Check if the device is there */
 	swsusp_resume_device = name_to_dev_t(resume_file);
-
-	/*
-	 * name_to_dev_t is ineffective to verify parition if resume_file is in
-	 * integer format. (e.g. major:minor)
-	 */
-	if (isdigit(resume_file[0]) && resume_wait) {
-		int partno;
-		while (!get_gendisk(swsusp_resume_device, &partno))
-			msleep(10);
-	}
-
 	if (!swsusp_resume_device) {
 		/*
 		 * Some device discovery might still be in progress; we need
-- 
2.25.1