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Tue, 04 Jul 2023 17:40:27 -0700 (PDT) Received: from bcacpedev-irv-3.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id cx3-20020a17090afd8300b00263987a50fcsm156512pjb.22.2023.07.04.17.40.24 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Jul 2023 17:40:25 -0700 (PDT) Subject: Re: [PATCH v3 3/5] mtd: rawnand: brcmnand: Fix crash during the panic_write To: Miquel Raynal Cc: Broadcom Kernel List , Linux MTD List , f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, Florian Fainelli , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Kamal Dasu References: <20230627193738.19596-1-william.zhang@broadcom.com> <20230627193738.19596-4-william.zhang@broadcom.com> <20230704172604.6924d2af@xps-13> From: William Zhang Message-ID: <287ecf48-9a8b-6cca-2888-37f6c71c4b39@broadcom.com> Date: Tue, 4 Jul 2023 17:40:03 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20230704172604.6924d2af@xps-13> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000064be5c05ffb2a5f8" X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --00000000000064be5c05ffb2a5f8 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Hi Miquel, On 07/04/2023 08:26 AM, Miquel Raynal wrote: > Hi William, > > william.zhang@broadcom.com wrote on Tue, 27 Jun 2023 12:37:36 -0700: > >> During the panic write path to execute another nand command, if >> there is a pending command, we should wait for the command instead of >> calling BUG_ON so we don't crash while crashing. >> >> Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller") > > The Fixes tag looks wrong. > The brcmnand_send_cmd function and BUG_ON line were added by this commit and the function didn't changed much since then. Not sure why you think it is wrong? >> Signed-off-by: William Zhang >> Reviewed-by: Florian Fainelli >> Reviewed-by: Kursad Oney >> Reviewed-by: Kamal Dasu >> --- >> >> Changes in v3: None >> Changes in v2: None >> >> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 12 +++++++++++- >> 1 file changed, 11 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> index 37c2c7cfa00e..ea03104692bf 100644 >> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> @@ -1608,7 +1608,17 @@ static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd) >> >> dev_dbg(ctrl->dev, "send native cmd %d addr 0x%llx\n", cmd, cmd_addr); >> >> - BUG_ON(ctrl->cmd_pending != 0); >> + /* >> + * If we came here through _panic_write and there is a pending >> + * command, try to wait for it. If it times out, rather than >> + * hitting BUG_ON, just return so we don't crash while crashing. >> + */ >> + if (oops_in_progress) { >> + if (ctrl->cmd_pending && >> + bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY, NAND_CTRL_RDY, 0)) >> + return; >> + } else >> + BUG_ON(ctrl->cmd_pending != 0); >> ctrl->cmd_pending = cmd; >> >> ret = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY, NAND_CTRL_RDY, 0); > > > Thanks, > Miquèl > --00000000000064be5c05ffb2a5f8 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT 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