netdev - [PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP

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Message-ID: <40de33ca69c0d3bcf8c827862768ae5d399698d6.1589926004.git.anchalag@amazon.com>
Date:   Tue, 19 May 2020 23:29:52 +0000
From:   Anchal Agarwal <anchalag@...zon.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, <x86@...nel.org>, <boris.ostrovsky@...cle.com>,
        <jgross@...e.com>, <linux-pm@...r.kernel.org>,
        <linux-mm@...ck.org>, <kamatam@...zon.com>,
        <sstabellini@...nel.org>, <konrad.wilk@...cle.com>,
        <roger.pau@...rix.com>, <axboe@...nel.dk>, <davem@...emloft.net>,
        <rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>,
        <peterz@...radead.org>, <eduval@...zon.com>, <sblbir@...zon.com>,
        <anchalag@...zon.com>, <xen-devel@...ts.xenproject.org>,
        <vkuznets@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dwmw@...zon.co.uk>,
        <benh@...nel.crashing.org>
Subject: [PATCH 12/12] PM / hibernate: update the resume offset on
 SNAPSHOT_SET_SWAP_AREA

From: Aleksei Besogonov <cyberax@...zon.com>

The SNAPSHOT_SET_SWAP_AREA is supposed to be used to set the hibernation
offset on a running kernel to enable hibernating to a swap file.
However, it doesn't actually update the swsusp_resume_block variable. As
a result, the hibernation fails at the last step (after all the data is
written out) in the validation of the swap signature in
mark_swapfiles().

Before this patch, the command line processing was the only place where
swsusp_resume_block was set.
[Changelog: Resolved patch conflict as code fragmented to
snapshot_set_swap_area]
Signed-off-by: Aleksei Besogonov <cyberax@...zon.com>
Signed-off-by: Munehisa Kamata <kamatam@...zon.com>
Signed-off-by: Anchal Agarwal <anchalag@...zon.com>
---
 kernel/power/user.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 7959449765d9..1afa1f0a223e 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -235,8 +235,12 @@ static int snapshot_set_swap_area(struct snapshot_data *data,
 		return -EINVAL;
 	}
 	data->swap = swap_type_of(swdev, offset, NULL);
-	if (data->swap < 0)
+	if (data->swap < 0) {
 		return -ENODEV;
+	} else {
+	    swsusp_resume_device = swdev;
+	    swsusp_resume_block = offset;
+	}
 	return 0;
 }
 
-- 
2.24.1.AMZN