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Sat, 3 Mar 2018 19:45:08 -0500 Received: from mail-bl2nam02on0099.outbound.protection.outlook.com ([104.47.38.99]:14560 "EHLO NAM02-BL2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932514AbeCCW0A (ORCPT ); Sat, 3 Mar 2018 17:26:00 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Miquel Raynal , Boris Brezillon , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 033/102] mtd: nand: fix interpretation of NAND_CMD_NONE in nand_command[_lp]() Thread-Topic: [PATCH AUTOSEL for 4.15 033/102] mtd: nand: fix interpretation of NAND_CMD_NONE in nand_command[_lp]() Thread-Index: AQHTsz5kU4LMLK3uu0SsP0m0JM1qyA== Date: Sat, 3 Mar 2018 22:24:28 +0000 Message-ID: <20180303222318.26006-33-alexander.levin@microsoft.com> References: <20180303222318.26006-1-alexander.levin@microsoft.com> In-Reply-To: <20180303222318.26006-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHSPR01MB353;7:d83WhhFhviqgNEl5zThIWhDHdjZbRnTe26x5q+8R4r6ha+MBbHCNEzektvbQGa9Ic8vtGFdq7atTuRxtvUBLLmDY6zRTd9zhkdtV8fj3kDexda+90NsmfUftSk3JzA3sKNOmSOVSR+M1xATZ75mxH4HsCrc0mIsPLZav0MFHOM5iuYZcKMrCabmKNeFXV5HXO64RBP7GcGBpFAdt1qwS80p19ChDQeebQ5pziC03dIfCoDalgwBU4lm+wDF/5jWl x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 20357e82-9b11-4318-c2da-08d58155bcec x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MWHSPR01MB353; 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x-microsoft-antispam-message-info: MS8aYqkVRW+d+Spc2pDboYoCz/nVhvHmG01/tAklbfnQXaKLmI8TRkXCeEt9/Pd/9AZnpggRSA82iB3ahfFF89AxwlBJjnvhG+BPJQpXcR0cirVT24gu6sd3hnLZ2AGeIPWvQwejmvp/Qj+y5b26heYmDdub5tZD9oq9i1oUBhA= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 20357e82-9b11-4318-c2da-08d58155bcec X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:24:28.7596 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHSPR01MB353 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Miquel Raynal [ Upstream commit df467899da0b71465760b4e35127bce837244eee ] Some drivers (like nand_hynix.c) call ->cmdfunc() with NAND_CMD_NONE and a column address and expect the controller to only send address cycles. Right now, the default ->cmdfunc() implementations provided by the core do not filter out the command cycle in this case and forwards the request to the controller driver through the ->cmd_ctrl() method. The thing is, NAND controller drivers can get this wrong and send a command cycle with a NAND_CMD_NONE opcode and since NAND_CMD_NONE is -1, and the command field is usually casted to an u8, we end up sending the 0xFF command which is actually a RESET operation. Add conditions in nand_command[_lp]() functions to sending the initial command cycle when command =3D=3D NAND_CMD_NONE. Signed-off-by: Miquel Raynal Signed-off-by: Boris Brezillon Signed-off-by: Sasha Levin --- drivers/mtd/nand/nand_base.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 9c702b46c6ee..e38edfa766f2 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -710,7 +710,8 @@ static void nand_command(struct mtd_info *mtd, unsigned= int command, chip->cmd_ctrl(mtd, readcmd, ctrl); ctrl &=3D ~NAND_CTRL_CHANGE; } - chip->cmd_ctrl(mtd, command, ctrl); + if (command !=3D NAND_CMD_NONE) + chip->cmd_ctrl(mtd, command, ctrl); =20 /* Address cycle, when necessary */ ctrl =3D NAND_CTRL_ALE | NAND_CTRL_CHANGE; @@ -738,6 +739,7 @@ static void nand_command(struct mtd_info *mtd, unsigned= int command, */ switch (command) { =20 + case NAND_CMD_NONE: case NAND_CMD_PAGEPROG: case NAND_CMD_ERASE1: case NAND_CMD_ERASE2: @@ -831,7 +833,9 @@ static void nand_command_lp(struct mtd_info *mtd, unsig= ned int command, } =20 /* Command latch cycle */ - chip->cmd_ctrl(mtd, command, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); + if (command !=3D NAND_CMD_NONE) + chip->cmd_ctrl(mtd, command, + NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); =20 if (column !=3D -1 || page_addr !=3D -1) { int ctrl =3D NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE; @@ -866,6 +870,7 @@ static void nand_command_lp(struct mtd_info *mtd, unsig= ned int command, */ switch (command) { =20 + case NAND_CMD_NONE: case NAND_CMD_CACHEDPROG: case NAND_CMD_PAGEPROG: case NAND_CMD_ERASE1: --=20 2.14.1