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 26444C00140 for ; Tue, 26 Jul 2022 17:48:23 +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-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:In-Reply-To: Date:References:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6nXkb2d/B6bquVF8O48uqMaUJdulOHGyZkU4xotn3To=; b=RdpXrCyefJzM96 UaVpMSe7Zq278lmCuoNyq5GgRrpbBOtZg4QIQ9b6YMHnOOk8GQUgfErkr0eF1zMtoMS0WgnYB8kS+ 3DwvHMRXP63BLrkNNfiP8vUIndWg0RKeAUH1D+YwFXauLZqNCzBbNDhRY81RBer1ihXecnMdKGJ48 TK/fS5dG8OhwCsACPbpepynXJSyN9ruXTzFvWc2NeLM3aQYMkD4/FcZCVaD4Kgb/8W93XpC+k/UyU 3BXGpFSMY2BezjR0nn0kfp0gjCUr/6NKWbSPtQfwCWfX5w1AFfLNpM5tmnO1vB0VkPSna8IAN+dSI yojIWXcR1oxpiI1rAA/Q==; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "ath11k" Errors-To: ath11k-bounces+ath11k=archiver.kernel.org@lists.infradead.org TWFuaXZhbm5hbiBTYWRoYXNpdmFtIDxtYW5pQGtlcm5lbC5vcmc+IHdyaXRlczoKCj4gT24gTW9u LCBKdWwgMjUsIDIwMjIgYXQgMDk6MDA6MDhQTSArMDMwMCwgS2FsbGUgVmFsbyB3cm90ZToKPgo+ PiBNYW5pdmFubmFuIFNhZGhhc2l2YW0gPG1hbmlAa2VybmVsLm9yZz4gd3JpdGVzOgo+PiAKPj4g PiBPbiBXZWQsIEp1bCAyMCwgMjAyMiBhdCAwNTo0NzozN1BNICswODAwLCBRaWFuZyBZdSB3cm90 ZToKPj4gPgo+PiA+PiAKPj4gPj4gT24gNy8yMC8yMDIyIDU6MzkgUE0sIE1hbml2YW5uYW4gU2Fk aGFzaXZhbSB3cm90ZToKPj4gPj4gPiBPbiBNb24sIEp1bCAxOCwgMjAyMiBhdCAwMjoxNToyM1BN ICswMzAwLCBLYWxsZSBWYWxvIHdyb3RlOgo+PiA+PiA+ID4gKyBhdGgxMWsgbGlzdAo+PiA+PiA+ ID4gCj4+ID4+ID4gPiBNYW5pdmFubmFuIFNhZGhhc2l2YW0gPG1hbmlAa2VybmVsLm9yZz4gd3Jp dGVzOgo+PiA+PiA+ID4gCj4+ID4+ID4gPiA+IE9uIFRodSwgSnVuIDIzLCAyMDIyIGF0IDEwOjQz OjAzQU0gKzA4MDAsIFFpYW5nIFl1IHdyb3RlOgo+PiA+PiA+ID4gPiA+IER1cmluZyBydW50aW1l LCB0aGUgTUhJIGVuZHBvaW50IG1heSBiZSBwb3dlcmVkIHVwL2Rvd24gc2V2ZXJhbCB0aW1lcy4K Pj4gPj4gPiA+ID4gPiBTbyBpbnN0ZWFkIG9mIGFsbG9jYXRpbmcgYW5kIGRlc3Ryb3lpbmcgdGhl IElSUXMgYWxsIHRoZSB0aW1lLCBsZXQncyBqdXN0Cj4+ID4+ID4gPiA+ID4gZW5hYmxlL2Rpc2Fi bGUgSVJRcyBkdXJpbmcgcG93ZXIgdXAvZG93bi4KPj4gPj4gPiA+ID4gPiAKPj4gPj4gPiA+ID4g PiBUaGUgSVJRcyB3aWxsIGJlIGFsbG9jYXRlZCBkdXJpbmcgbWhpX3JlZ2lzdGVyX2NvbnRyb2xs ZXIoKSBhbmQgZnJlZWQKPj4gPj4gPiA+ID4gPiBkdXJpbmcgbWhpX3VucmVnaXN0ZXJfY29udHJv bGxlcigpLiBUaGlzIHdvcmtzIHdlbGwgZm9yIHRoaW5ncyBsaWtlIFBDSQo+PiA+PiA+ID4gPiA+ IGhvdHBsdWcgYWxzbyBhcyBvbmNlIHRoZSBQQ0kgZGV2aWNlIGdldHMgcmVtb3ZlZCwgdGhlIGNv bnRyb2xsZXIgd2lsbAo+PiA+PiA+ID4gPiA+IGdldCB1bnJlZ2lzdGVyZWQuIEFuZCBvbmNlIGl0 IGNvbWVzIGJhY2ssIGl0IHdpbGwgZ2V0IHJlZ2lzdGVyZWQgYmFjawo+PiA+PiA+ID4gPiA+IGFu ZCBldmVuIGlmIHRoZSBJUlEgY29uZmlndXJhdGlvbiBjaGFuZ2VzIChNU0kpLCB0aGF0IHdpbGwg Z2V0IGFjY291bnRlZC4KPj4gPj4gPiA+ID4gPiAKPj4gPj4gPiA+ID4gPiBTaWduZWQtb2ZmLWJ5 OiBRaWFuZyBZdSA8cXVpY19xaWFueXVAcXVpY2luYy5jb20+Cj4+ID4+ID4gPiA+IEFwcGxpZWQg dG8gbWhpLW5leHQhCj4+ID4+ID4gPiBJIGRpZCBhIGJpc2VjdCBhbmQgdGhpcyBwYXRjaCBicmVh a3MgYXRoMTFrIGR1cmluZyBybW1vZC4gSSdtIG9uCj4+ID4+ID4gPiB2YWNhdGlvbiByaWdodCBu b3cgc28gSSBjYW4ndCBpbnZlc3RpZ2F0ZSBpbiBkZXRhaWwgYnV0IG1vcmUgaW5mbyBiZWxvdy4K Pj4gPj4gPiA+IAo+PiA+PiA+IEkganVzdCB0ZXN0ZWQgbGludXgtbmV4dC9tYXN0ZXIgbmV4dC0y MDIyMDcxOCBvbiBteSBOVUMgd2l0aCBRQ0E2MzkwLCBidXQgSSdtCj4+ID4+ID4gbm90IGFibGUg dG8gcmVwcm9kdWNlIHRoZSBpc3N1ZSBkdXJpbmcgcm1tb2QhIEluc3RlYWQgSSBjb3VsZG4ndCBj b25uZWN0IHRvIEFQLgo+PiA+PiAKPj4gPj4gSSBzdXNwZWN0IHRoYXQgaW4gX19mcmVlX2lycSgp LCBpZiBDT05GSUdfREVCVUdfU0hJUlEgaXMgZW5hYmxlZCwgaXJxCj4+ID4+IGhhbmRsZXIgZm9y IGEgc2hhcmVkIElSUSB3aWxsIGJlIGludm9rZWQgYW5kIG51bGwgcG9pbnRlciBhY2Nlc3MgaGFw cGVuLgo+PiA+PiAKPj4gPj4gI2lmZGVmIENPTkZJR19ERUJVR19TSElSUQo+PiA+PiDCoMKgIMKg LyoKPj4gPj4gwqDCoCDCoCAqIEl0J3MgYSBzaGFyZWQgSVJRIC0tIHRoZSBkcml2ZXIgb3VnaHQg dG8gYmUgcHJlcGFyZWQgZm9yIGFuIElSUQo+PiA+PiDCoMKgIMKgICogZXZlbnQgdG8gaGFwcGVu IGV2ZW4gbm93IGl0J3MgYmVpbmcgZnJlZWQsIHNvIGxldCdzIG1ha2Ugc3VyZSB0aGF0Cj4+ID4+ IMKgwqAgwqAgKiBpcyBzbyBieSBkb2luZyBhbiBleHRyYSBjYWxsIHRvIHRoZSBoYW5kbGVyIC4u Li4KPj4gPj4gwqDCoCDCoCAqCj4+ID4+IMKgwqAgwqAgKiAoIFdlIGRvIHRoaXMgYWZ0ZXIgYWN0 dWFsbHkgZGVyZWdpc3RlcmluZyBpdCwgdG8gbWFrZSBzdXJlIHRoYXQgYQo+PiA+PiDCoMKgIMKg ICrCoMKgICdyZWFsJyBJUlEgZG9lc24ndCBydW4gaW4gcGFyYWxsZWwgd2l0aCBvdXIgZmFrZS4g KQo+PiA+PiDCoMKgIMKgICovCj4+ID4+IMKgwqAgwqBpZiAoYWN0aW9uLT5mbGFncyAmIElSUUZf U0hBUkVEKSB7Cj4+ID4+IMKgwqAgwqDCoMKgwqAgbG9jYWxfaXJxX3NhdmUoZmxhZ3MpOwo+PiA+ PiDCoMKgIMKgwqDCoMKgIGFjdGlvbi0+aGFuZGxlcihpcnEsIGRldl9pZCk7Cj4+ID4+IMKgwqAg wqDCoMKgwqAgbG9jYWxfaXJxX3Jlc3RvcmUoZmxhZ3MpOwo+PiA+PiDCoMKgIMKgfQo+PiA+PiAj ZW5kaWYKPj4gPj4gCj4+ID4KPj4gPiBBaCB5ZXMsIGFmdGVyIGVuYWJsaW5nIENPTkZJR19ERUJV R19TSElSUSBJIGNvdWxkIHJlcHJvZHVjZSB0aGUgaXNzdWUuCj4+IAo+PiBTbyBob3cgdG8gZml4 IHRoaXMgcmVncmVzc2lvbj8gKElmIHRoZXJlJ3MgYWxyZWFkeSBhIGZpeCBJIG1pZ2h0IGhhdmUK Pj4gbWlzc2VkIGl0IGFzIEkgY2FtZSBiYWNrIG9ubHkgdG9kYXkpCj4+IAo+Cj4gQ29waWVkIHlv dSBvbiB0aGUgZml4IHBhdGNoLiBQbGVhc2UgdGVzdCBhbmQgbGV0IHVzIGtub3chCgpUaGFua3Ms IHRlc3RpbmcgaXQgcmlnaHQgbm93LiBXaWxsIGxldCB5b3Uga25vdyB0aGUgcmVzdWx0IGFzIGEg cmVwbHkgdG8KdGhlIHBhdGNoLgoKLS0gCmh0dHBzOi8vcGF0Y2h3b3JrLmtlcm5lbC5vcmcvcHJv amVjdC9saW51eC13aXJlbGVzcy9saXN0LwoKaHR0cHM6Ly93aXJlbGVzcy53aWtpLmtlcm5lbC5v cmcvZW4vZGV2ZWxvcGVycy9kb2N1bWVudGF0aW9uL3N1Ym1pdHRpbmdwYXRjaGVzCgotLSAKYXRo MTFrIG1haWxpbmcgbGlzdAphdGgxMWtAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMu aW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2F0aDExawo= 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F3BBC00140 for ; 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s=k20201202; t=1658857691; bh=jBQWWYLAlwhQocmCejiAludOWzxiwJJG/jaLDBo9abU=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=JaLKe/taM87sXwV5wgYLDJmRHMRotMw71eAuOWV5JPQFtC9dbG8P98j0vQaf7tELA UhiiM6Qsjg7oz2zdNzGn4Wvr91JKJ9f4F99MdtQlwXdArtoBlxHf2/94oNO5nUSp7I 9413FCmNn8X5AKozZJWEGdfel/SDI/yZqdsNF3/sgLteCKjlEcXe1CSoetGZATQc+Q ph06HgBlXIGdUVYUtP5BgQNbIfwSadrIAr0CDC4mkd2C2Mb8pKqqfVIB8TQkA1+xnz S4QIkjDTMmgXPo2J7uThrqx3Y4fJgYm7QbPEH9D0dLeNdhTQ220KSPebSpSpt1mSuE KbgK2TGJNgxUA== From: Kalle Valo To: Manivannan Sadhasivam Cc: Qiang Yu , quic_hemantk@quicinc.com, loic.poulain@linaro.org, quic_jhugo@quicinc.com, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_cang@quicinc.com, ath11k@lists.infradead.org Subject: Re: [PATCH v4 1/1] bus: mhi: host: Move IRQ allocation to controller registration phase References: <1655952183-66792-1-git-send-email-quic_qianyu@quicinc.com> <20220624072740.GA12171@thinkpad> <87k08an038.fsf@kernel.org> <20220720093909.GA5747@thinkpad> <063fe6bf-11b1-1724-058f-0fed7247906e@quicinc.com> <20220721101914.GC36189@thinkpad> <87wnc1qdhz.fsf@kernel.org> <20220726080913.GF5522@workstation> Date: Tue, 26 Jul 2022 20:48:05 +0300 In-Reply-To: <20220726080913.GF5522@workstation> (Manivannan Sadhasivam's message of "Tue, 26 Jul 2022 13:39:13 +0530") Message-ID: <87h733rciy.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Manivannan Sadhasivam writes: > On Mon, Jul 25, 2022 at 09:00:08PM +0300, Kalle Valo wrote: > >> Manivannan Sadhasivam writes: >>=20 >> > On Wed, Jul 20, 2022 at 05:47:37PM +0800, Qiang Yu wrote: >> > >> >>=20 >> >> On 7/20/2022 5:39 PM, Manivannan Sadhasivam wrote: >> >> > On Mon, Jul 18, 2022 at 02:15:23PM +0300, Kalle Valo wrote: >> >> > > + ath11k list >> >> > >=20 >> >> > > Manivannan Sadhasivam writes: >> >> > >=20 >> >> > > > On Thu, Jun 23, 2022 at 10:43:03AM +0800, Qiang Yu wrote: >> >> > > > > During runtime, the MHI endpoint may be powered up/down sever= al times. >> >> > > > > So instead of allocating and destroying the IRQs all the time= , let's just >> >> > > > > enable/disable IRQs during power up/down. >> >> > > > >=20 >> >> > > > > The IRQs will be allocated during mhi_register_controller() a= nd freed >> >> > > > > during mhi_unregister_controller(). This works well for thing= s like PCI >> >> > > > > hotplug also as once the PCI device gets removed, the control= ler will >> >> > > > > get unregistered. And once it comes back, it will get registe= red back >> >> > > > > and even if the IRQ configuration changes (MSI), that will ge= t accounted. >> >> > > > >=20 >> >> > > > > Signed-off-by: Qiang Yu >> >> > > > Applied to mhi-next! >> >> > > I did a bisect and this patch breaks ath11k during rmmod. I'm on >> >> > > vacation right now so I can't investigate in detail but more info= below. >> >> > >=20 >> >> > I just tested linux-next/master next-20220718 on my NUC with QCA639= 0, but I'm >> >> > not able to reproduce the issue during rmmod! Instead I couldn't co= nnect to AP. >> >>=20 >> >> I suspect that in __free_irq(), if CONFIG_DEBUG_SHIRQ is enabled, irq >> >> handler for a shared IRQ will be invoked and null pointer access happ= en. >> >>=20 >> >> #ifdef CONFIG_DEBUG_SHIRQ >> >> =C2=A0=C2=A0 =C2=A0/* >> >> =C2=A0=C2=A0 =C2=A0 * It's a shared IRQ -- the driver ought to be pre= pared for an IRQ >> >> =C2=A0=C2=A0 =C2=A0 * event to happen even now it's being freed, so l= et's make sure that >> >> =C2=A0=C2=A0 =C2=A0 * is so by doing an extra call to the handler .... >> >> =C2=A0=C2=A0 =C2=A0 * >> >> =C2=A0=C2=A0 =C2=A0 * ( We do this after actually deregistering it, t= o make sure that a >> >> =C2=A0=C2=A0 =C2=A0 *=C2=A0=C2=A0 'real' IRQ doesn't run in parallel = with our fake. ) >> >> =C2=A0=C2=A0 =C2=A0 */ >> >> =C2=A0=C2=A0 =C2=A0if (action->flags & IRQF_SHARED) { >> >> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 local_irq_save(flags); >> >> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 action->handler(irq, dev_id); >> >> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 local_irq_restore(flags); >> >> =C2=A0=C2=A0 =C2=A0} >> >> #endif >> >>=20 >> > >> > Ah yes, after enabling CONFIG_DEBUG_SHIRQ I could reproduce the issue. >>=20 >> So how to fix this regression? (If there's already a fix I might have >> missed it as I came back only today) >>=20 > > Copied you on the fix patch. Please test and let us know! Thanks, testing it right now. Will let you know the result as a reply to the patch. --=20 https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatc= hes