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Message-ID: <20230805065510.GA18650@thinkpad> References: <7ad1160b-5f8c-47af-a1c5-51b34f656fab@kadam.mountain> <20230804184550.0cb12369@xps-13> <3604e2ed-8d30-4f7b-9e56-7af5b23b2ac5@kadam.mountain> <20230804190750.3367a044@xps-13> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230804190750.3367a044@xps-13> X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 93392140010 X-Stat-Signature: h47c3dm93y9335hydn9mf3epgfhhpps8 X-HE-Tag: 1691218517-68097 X-HE-Meta: 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 yqEK2PvB 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Aug 04, 2023 at 07:07:50PM +0200, Miquel Raynal wrote: > Hi Dan, > > dan.carpenter@linaro.org wrote on Fri, 4 Aug 2023 19:52:50 +0300: > > > On Fri, Aug 04, 2023 at 06:45:50PM +0200, Miquel Raynal wrote: > > > Hi Sadre, Sricharan & Manivannan, > > > > > > A couple of questions for you below. > > > > > > dan.carpenter@linaro.org wrote on Thu, 3 Aug 2023 15:20:56 +0300: > > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > > > head: fb4327106e5250ee360d0d8b056c1eef7eeb9a98 > > > > commit: 89550beb098e04b951df079483fb064eafc0e5fa [1937/6910] mtd: rawnand: qcom: Implement exec_op() > > > > config: riscv-randconfig-m031-20230730 (https://download.01.org/0day-ci/archive/20230803/202308032022.SnXkKyFs-lkp@intel.com/config) > > > > compiler: riscv64-linux-gcc (GCC) 12.3.0 > > > > reproduce: (https://download.01.org/0day-ci/archive/20230803/202308032022.SnXkKyFs-lkp@intel.com/reproduce) > > > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > > > the same patch/commit), kindly add following tags > > > > | Reported-by: kernel test robot > > > > | Reported-by: Dan Carpenter > > > > | Closes: https://lore.kernel.org/r/202308032022.SnXkKyFs-lkp@intel.com/ > > > > > > > > New smatch warnings: > > > > drivers/mtd/nand/raw/qcom_nandc.c:2941 qcom_op_cmd_mapping() error: uninitialized symbol 'ret'. > > > > drivers/mtd/nand/raw/qcom_nandc.c:3369 qcom_check_op() warn: was && intended here instead of ||? > > > > > > > > Old smatch warnings: > > > > drivers/mtd/nand/raw/qcom_nandc.c:3076 qcom_read_status_exec() warn: inconsistent indenting > > > > > > > > vim +/ret +2941 drivers/mtd/nand/raw/qcom_nandc.c > > > > > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2909 static int qcom_op_cmd_mapping(struct qcom_nand_controller *nandc, u8 cmd, > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2910 struct qcom_op *q_op) > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2911 { > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2912 int ret; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2913 > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2914 switch (cmd) { > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2915 case NAND_CMD_RESET: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2916 ret = OP_RESET_DEVICE; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2917 break; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2918 case NAND_CMD_READID: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2919 ret = OP_FETCH_ID; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2920 break; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2921 case NAND_CMD_PARAM: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2922 if (nandc->props->qpic_v2) > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2923 ret = OP_PAGE_READ_ONFI_READ; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2924 else > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2925 ret = OP_PAGE_READ; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2926 break; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2927 case NAND_CMD_ERASE1: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2928 case NAND_CMD_ERASE2: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2929 ret = OP_BLOCK_ERASE; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2930 break; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2931 case NAND_CMD_STATUS: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2932 ret = OP_CHECK_STATUS; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2933 break; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2934 case NAND_CMD_PAGEPROG: > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2935 ret = OP_PROGRAM_PAGE; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2936 q_op->flag = OP_PROGRAM_PAGE; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2937 nandc->exec_opwrite = true; > > > > 89550beb098e04 drivers/mtd/nand/raw/qcom_nandc.c Md Sadre Alam 2023-07-10 2938 break; > > > > > > > > No default case. I'm more concerned about the && vs || warning, but > > > > the zero day bot doesn't include that code into the email. > > > > > > The default case here is in theory not possible, as long as > > > qcom_check_op() is properly implemented. We should however silence the > > > warning by handling it. Maybe a WARN_ON_ONCE() + ret = > > will produce an error when executing the command> would work. > > > > > > > The kbuild-bot runs without the cross function database so it has a lot > > of false positives that you wouldn't see if you had the DB. (There > > isn't really a way to build with the cross function DB. It takes way > > way way too long. Also it sometimes finds bug which are complicated to > > explain or to assign blame for in an automated way). But these false > > positives are frustrating to me. > > I understand. > > > In real life, GCC is going to automatically initialize stack variables > > to zero on production systems. > > Well, we must silence this by setting reg in all cases, but here the > variable is badly named, it should be s/ret/cmd/. That's why, if we > silence it properly, I would go for a runtime warning if we ever > encounter the situation because this is a purely software bug. > I agree, it is better to add a default case for sanity. Regarding the variable naming, I agree it should be improved. Something like, s/cmd/opcode s/ret/cmd Also, I do not want to add WARN_ON_ONCE() here, but rather a dev_err(). > > > However I doubt the following piece of code has been successfully > > > tested: > > > > > > for (op_id = 0; op_id < op->ninstrs; op_id++) { > > > instr = &op->instrs[op_id]; > > > > > > switch (instr->type) { > > > case NAND_OP_CMD_INSTR: > > > if (instr->ctx.cmd.opcode != NAND_CMD_RESET || > > > instr->ctx.cmd.opcode != NAND_CMD_READID || > > > instr->ctx.cmd.opcode != NAND_CMD_PARAM || > > > instr->ctx.cmd.opcode != NAND_CMD_ERASE1 || > > > instr->ctx.cmd.opcode != NAND_CMD_ERASE2 || > > > instr->ctx.cmd.opcode != NAND_CMD_STATUS || > > > instr->ctx.cmd.opcode != NAND_CMD_PAGEPROG) > > > return -ENOTSUPP; > > > break; > > > > > > The || should be &&, otherwise it cannot work, or am I missing > > > something? > > > > Yeah. That's how this bug normally looks like. NAND_OP_CMD_INSTR > > always returns -ENOTSUPP. > > Yes, this is a bug. I didn't get a chance to review the exec_op conversion series (blame myself). Now I see scope for a cleaup series :/ Let me spin something by the end of today. - Mani > > regards, > > dan carpenter > > > > > Thanks, > Miquèl -- மணிவண்ணன் சதாசிவம்