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([2a05:6e02:1041:c10:c49e:e1a5:3210:b8c0]) by smtp.googlemail.com with ESMTPSA id f8-20020adfe908000000b0032d8ce46caasm2778956wrm.93.2023.10.12.08.39.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Oct 2023 08:39:08 -0700 (PDT) Message-ID: Date: Thu, 12 Oct 2023 17:39:08 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Subject: thermal: Fix potential race condition in suspend/resume Content-Language: en-US To: Bo Ye , "Rafael J. Wysocki" , Amit Kucheria , Zhang Rui , Matthias Brugger , AngeloGioacchino Del Regno Cc: yugang.wang@mediatek.com, yongdong.zhang@mediatek.com, browse.zhang@mediatek.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org References: <20230916113327.85693-1-bo.ye@mediatek.com> From: Daniel Lezcano In-Reply-To: <20230916113327.85693-1-bo.ye@mediatek.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231012_083913_016530_978377D5 X-CRM114-Status: GOOD ( 21.25 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 16/09/2023 13:33, Bo Ye wrote: > From: "yugang.wang" > > Body: > This patch fixes a race condition during system resume. It occurs if > the system is exiting a suspend state and a user is trying to > register/unregister a thermal zone concurrently. The root cause is > that both actions access the `thermal_tz_list`. I'm not sure the tasks are already thawed during POST_RESTORE, so no user can unload a driver and then reaching the race window. Is that an observed issue? > In detail: > > 1. At PM_POST_SUSPEND during the resume, the system reads all thermal > zones in `thermal_tz_list`, then resets and updates their > temperatures. > 2. When registering/unregistering a thermal zone, the > `thermal_tz_list` gets manipulated. > > These two actions might occur concurrently, causing a race condition. > To solve this issue, we introduce a mutex lock to protect > `thermal_tz_list` from being modified while it's being read and > updated during the resume from suspend. > > Kernel oops excerpt related to this fix: > > [ 5201.869845] [T316822] pc: [0xffffffeb7d4876f0] mutex_lock+0x34/0x170 > [ 5201.869856] [T316822] lr: [0xffffffeb7ca98a84] thermal_pm_notify+0xd4/0x26c > [... cut for brevity ...] > [ 5201.871061] [T316822] suspend_prepare+0x150/0x470 > [ 5201.871067] [T316822] enter_state+0x84/0x6f4 > [ 5201.871076] [T316822] state_store+0x15c/0x1e8 > > Change-Id: Ifdbdecba17093f91eab7e36ce04b46d311ca6568 > Signed-off-by: yugang.wang > Signed-off-by: Bo Ye > --- > drivers/thermal/thermal_core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c > index 8717a3343512..a7a18ed57b6d 100644 > --- a/drivers/thermal/thermal_core.c > +++ b/drivers/thermal/thermal_core.c > @@ -1529,12 +1529,14 @@ static int thermal_pm_notify(struct notifier_block *nb, > case PM_POST_HIBERNATION: > case PM_POST_RESTORE: > case PM_POST_SUSPEND: > + mutex_lock(&thermal_list_lock); > atomic_set(&in_suspend, 0); > list_for_each_entry(tz, &thermal_tz_list, node) { > thermal_zone_device_init(tz); > thermal_zone_device_update(tz, > THERMAL_EVENT_UNSPECIFIED); > } > + mutex_unlock(&thermal_list_lock); > break; > default: > break; -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB4ADCDB47E for ; Thu, 12 Oct 2023 15:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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([2a05:6e02:1041:c10:c49e:e1a5:3210:b8c0]) by smtp.googlemail.com with ESMTPSA id f8-20020adfe908000000b0032d8ce46caasm2778956wrm.93.2023.10.12.08.39.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Oct 2023 08:39:08 -0700 (PDT) Message-ID: Date: Thu, 12 Oct 2023 17:39:08 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Subject: thermal: Fix potential race condition in suspend/resume Content-Language: en-US To: Bo Ye , "Rafael J. Wysocki" , Amit Kucheria , Zhang Rui , Matthias Brugger , AngeloGioacchino Del Regno Cc: yugang.wang@mediatek.com, yongdong.zhang@mediatek.com, browse.zhang@mediatek.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org References: <20230916113327.85693-1-bo.ye@mediatek.com> From: Daniel Lezcano In-Reply-To: <20230916113327.85693-1-bo.ye@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231012_083914_333012_4B137814 X-CRM114-Status: GOOD ( 22.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMTYvMDkvMjAyMyAxMzozMywgQm8gWWUgd3JvdGU6Cj4gRnJvbTogInl1Z2FuZy53YW5nIiA8 eXVnYW5nLndhbmdAbWVkaWF0ZWsuY29tPgo+IAo+IEJvZHk6Cj4gVGhpcyBwYXRjaCBmaXhlcyBh IHJhY2UgY29uZGl0aW9uIGR1cmluZyBzeXN0ZW0gcmVzdW1lLiBJdCBvY2N1cnMgaWYKPiB0aGUg c3lzdGVtIGlzIGV4aXRpbmcgYSBzdXNwZW5kIHN0YXRlIGFuZCBhIHVzZXIgaXMgdHJ5aW5nIHRv Cj4gcmVnaXN0ZXIvdW5yZWdpc3RlciBhIHRoZXJtYWwgem9uZSBjb25jdXJyZW50bHkuIFRoZSBy b290IGNhdXNlIGlzCj4gdGhhdCBib3RoIGFjdGlvbnMgYWNjZXNzIHRoZSBgdGhlcm1hbF90el9s aXN0YC4KCkknbSBub3Qgc3VyZSB0aGUgdGFza3MgYXJlIGFscmVhZHkgdGhhd2VkIGR1cmluZyBQ T1NUX1JFU1RPUkUsIHNvIG5vIAp1c2VyIGNhbiB1bmxvYWQgYSBkcml2ZXIgYW5kIHRoZW4gcmVh Y2hpbmcgdGhlIHJhY2Ugd2luZG93LgoKSXMgdGhhdCBhbiBvYnNlcnZlZCBpc3N1ZT8KCgo+IElu IGRldGFpbDoKPiAKPiAxLiBBdCBQTV9QT1NUX1NVU1BFTkQgZHVyaW5nIHRoZSByZXN1bWUsIHRo ZSBzeXN0ZW0gcmVhZHMgYWxsIHRoZXJtYWwKPiAgICAgem9uZXMgaW4gYHRoZXJtYWxfdHpfbGlz dGAsIHRoZW4gcmVzZXRzIGFuZCB1cGRhdGVzIHRoZWlyCj4gICAgIHRlbXBlcmF0dXJlcy4KPiAy LiBXaGVuIHJlZ2lzdGVyaW5nL3VucmVnaXN0ZXJpbmcgYSB0aGVybWFsIHpvbmUsIHRoZQo+ICAg ICBgdGhlcm1hbF90el9saXN0YCBnZXRzIG1hbmlwdWxhdGVkLgo+IAo+IFRoZXNlIHR3byBhY3Rp b25zIG1pZ2h0IG9jY3VyIGNvbmN1cnJlbnRseSwgY2F1c2luZyBhIHJhY2UgY29uZGl0aW9uLgo+ IFRvIHNvbHZlIHRoaXMgaXNzdWUsIHdlIGludHJvZHVjZSBhIG11dGV4IGxvY2sgdG8gcHJvdGVj dAo+IGB0aGVybWFsX3R6X2xpc3RgIGZyb20gYmVpbmcgbW9kaWZpZWQgd2hpbGUgaXQncyBiZWlu ZyByZWFkIGFuZAo+IHVwZGF0ZWQgZHVyaW5nIHRoZSByZXN1bWUgZnJvbSBzdXNwZW5kLgo+IAo+ IEtlcm5lbCBvb3BzIGV4Y2VycHQgcmVsYXRlZCB0byB0aGlzIGZpeDoKPiAKPiBbIDUyMDEuODY5 ODQ1XSBbVDMxNjgyMl0gcGM6IFsweGZmZmZmZmViN2Q0ODc2ZjBdIG11dGV4X2xvY2srMHgzNC8w eDE3MAo+IFsgNTIwMS44Njk4NTZdIFtUMzE2ODIyXSBscjogWzB4ZmZmZmZmZWI3Y2E5OGE4NF0g dGhlcm1hbF9wbV9ub3RpZnkrMHhkNC8weDI2Ywo+IFsuLi4gY3V0IGZvciBicmV2aXR5IC4uLl0K PiBbIDUyMDEuODcxMDYxXSBbVDMxNjgyMl0gIHN1c3BlbmRfcHJlcGFyZSsweDE1MC8weDQ3MAo+ IFsgNTIwMS44NzEwNjddIFtUMzE2ODIyXSAgZW50ZXJfc3RhdGUrMHg4NC8weDZmNAo+IFsgNTIw MS44NzEwNzZdIFtUMzE2ODIyXSAgc3RhdGVfc3RvcmUrMHgxNWMvMHgxZTgKPiAKPiBDaGFuZ2Ut SWQ6IElmZGJkZWNiYTE3MDkzZjkxZWFiN2UzNmNlMDRiNDZkMzExY2E2NTY4Cj4gU2lnbmVkLW9m Zi1ieTogeXVnYW5nLndhbmcgPHl1Z2FuZy53YW5nQG1lZGlhdGVrLmNvbT4KPiBTaWduZWQtb2Zm LWJ5OiBCbyBZZSA8Ym8ueWVAbWVkaWF0ZWsuY29tPgo+IC0tLQo+ICAgZHJpdmVycy90aGVybWFs L3RoZXJtYWxfY29yZS5jIHwgMiArKwo+ICAgMSBmaWxlIGNoYW5nZWQsIDIgaW5zZXJ0aW9ucygr KQo+IAo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3RoZXJtYWwvdGhlcm1hbF9jb3JlLmMgYi9kcml2 ZXJzL3RoZXJtYWwvdGhlcm1hbF9jb3JlLmMKPiBpbmRleCA4NzE3YTMzNDM1MTIuLmE3YTE4ZWQ1 N2I2ZCAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3RoZXJtYWwvdGhlcm1hbF9jb3JlLmMKPiArKysg Yi9kcml2ZXJzL3RoZXJtYWwvdGhlcm1hbF9jb3JlLmMKPiBAQCAtMTUyOSwxMiArMTUyOSwxNCBA QCBzdGF0aWMgaW50IHRoZXJtYWxfcG1fbm90aWZ5KHN0cnVjdCBub3RpZmllcl9ibG9jayAqbmIs Cj4gICAJY2FzZSBQTV9QT1NUX0hJQkVSTkFUSU9OOgo+ICAgCWNhc2UgUE1fUE9TVF9SRVNUT1JF Ogo+ICAgCWNhc2UgUE1fUE9TVF9TVVNQRU5EOgo+ICsJCW11dGV4X2xvY2soJnRoZXJtYWxfbGlz dF9sb2NrKTsKPiAgIAkJYXRvbWljX3NldCgmaW5fc3VzcGVuZCwgMCk7Cj4gICAJCWxpc3RfZm9y X2VhY2hfZW50cnkodHosICZ0aGVybWFsX3R6X2xpc3QsIG5vZGUpIHsKPiAgIAkJCXRoZXJtYWxf em9uZV9kZXZpY2VfaW5pdCh0eik7Cj4gICAJCQl0aGVybWFsX3pvbmVfZGV2aWNlX3VwZGF0ZSh0 eiwKPiAgIAkJCQkJCSAgIFRIRVJNQUxfRVZFTlRfVU5TUEVDSUZJRUQpOwo+ICAgCQl9Cj4gKwkJ bXV0ZXhfdW5sb2NrKCZ0aGVybWFsX2xpc3RfbG9jayk7Cj4gICAJCWJyZWFrOwo+ICAgCWRlZmF1 bHQ6Cj4gICAJCWJyZWFrOwoKLS0gCjxodHRwOi8vd3d3LmxpbmFyby5vcmcvPiBMaW5hcm8ub3Jn IOKUgiBPcGVuIHNvdXJjZSBzb2Z0d2FyZSBmb3IgQVJNIFNvQ3MKCkZvbGxvdyBMaW5hcm86ICA8 aHR0cDovL3d3dy5mYWNlYm9vay5jb20vcGFnZXMvTGluYXJvPiBGYWNlYm9vayB8CjxodHRwOi8v dHdpdHRlci5jb20vIyEvbGluYXJvb3JnPiBUd2l0dGVyIHwKPGh0dHA6Ly93d3cubGluYXJvLm9y Zy9saW5hcm8tYmxvZy8+IEJsb2cKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2Vy bmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1h bi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==