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Thu, 06 Jul 2023 13:08:41 -0700 (PDT) Message-ID: <82362ecb-2049-14f4-f176-36bfcbbf84ad@broadcom.com> Date: Thu, 6 Jul 2023 13:08:38 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH] i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue To: Wolfram Sang , YE Chengfeng , "andi.shyti@kernel.org" , "rjui@broadcom.com" , "sbranden@broadcom.com" , "linux-i2c@vger.kernel.org" , Linux ARM , "linux-kernel@vger.kernel.org" , "bcm-kernel-feedback-list@broadcom.com" References: From: Ray Jui In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230706_130846_064175_9B2AB004 X-CRM114-Status: GOOD ( 11.46 ) 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-Type: multipart/mixed; boundary="===============0628916575271735434==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============0628916575271735434== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000406e7905ffd71556" --000000000000406e7905ffd71556 Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Wolfram, On 7/6/2023 12:36 PM, Wolfram Sang wrote: > On Sat, Jun 24, 2023 at 07:36:02PM +0000, YE Chengfeng wrote: >> iproc_i2c_rd_reg and iproc_i2c_wr_reg are called from both >> interrupt context (e.g. bcm_iproc_i2c_isr) and process context >> (e.g. bcm_iproc_i2c_suspend). Therefore, interrupts should be >> disabled to avoid potential deadlock. To prevent this deadlock, >> use spin_lock_irqsave. >> >> Signed-off-by: Chengfeng Ye > > I can't apply it, what version is this against? Also, if someone could > supply a proper Fixes-tag, this would be much appreciated. > I'll let Chengfeng check the version. For the fixes tag, it is: Fixes: 9a1038728037 ("i2c: iproc: add NIC I2C support") Thanks, Ray --000000000000406e7905ffd71556 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQXgYJKoZIhvcNAQcCoIIQTzCCEEsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg21MIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e 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