From: Manivannan Sadhasivam <mani@kernel.org> To: Martin Kaiser <martin@kaiser.cx> Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Dan Carpenter <dan.carpenter@oracle.com>, Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>, Boris Brezillon <boris.brezillon@collabora.com>, Tudor Ambarus <tudor.ambarus@microchip.com>, linux-mtd@lists.infradead.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH] mtd: rawnand: Add a check in of_get_nand_secure_regions() Date: Sat, 24 Jul 2021 21:33:08 +0530 [thread overview] Message-ID: <20210724160308.GA62321@thinkpad> (raw) In-Reply-To: <20210724142712.GA24036@martin-debian-1.paytec.ch> On Sat, Jul 24, 2021 at 04:27:30PM +0200, Martin Kaiser wrote: > Hi all, > > Thus wrote Miquel Raynal (miquel.raynal@bootlin.com): > > > On Thu, 2021-06-17 at 13:37:25 UTC, Dan Carpenter wrote: > > > Check for whether of_property_count_elems_of_size() returns a negative > > > error code. > > > > Fixes: 13b89768275d ("mtd: rawnand: Add support for secure regions in NAND memory") > > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> > > > Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> > > > Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes, thanks. > > I'm running linux-next on an imx25 system with the following flash chip > > [ 1.997539] nand: device found, Manufacturer ID: 0x98, Chip ID: 0xaa > [ 2.004134] nand: Toshiba NAND 256MiB 1,8V 8-bit > [ 2.008917] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 128 > > The system is using the drivers/mtd/nand/raw/mxc_nand.c driver. > > Since this commit appeared in linux-next, mxc_nand's probe function fails > with -EINVAL, taking this path > > mxcnd_probe > nand_scan > nand_scan_with_ids > nand_scan_tail > of_get_nand_secure_regions > > nr_elem = of_property_count_elems_of_size(dn, "secure-regions", sizeof(u64)); > returns -EINVAL as there's no secure-regions property in my device tree. > Doh! Sorry for missing this. > We should certainly handle negative error codes before we calculate > chip->nr_secure_regions = nr_elem / 2 > but a missing secure-regions property is a valid case and should not make > the probe fail. > Absolutely! > If the property exists, but the device-tree entry is incorrect > and of_property_count_elems_of_size returns -ENODATA, we might print a > warning and ignore the entry. > Hmm, I think it is best to error out in this case as the user has got DT wrong. > What do you think? > Since of_property_count_elems_of_size() returns -EINVAL if the length is not a multiple of sizeof(u64), we can't just ignore -EINVAL. So I think we can just check for the existence of the property before invoking of_get_nand_secure_regions(). Miquel, what do you think? Thanks, Mani > Thanks, > > Martin
WARNING: multiple messages have this Message-ID (diff)
From: Manivannan Sadhasivam <mani@kernel.org> To: Martin Kaiser <martin@kaiser.cx> Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Dan Carpenter <dan.carpenter@oracle.com>, Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>, Boris Brezillon <boris.brezillon@collabora.com>, Tudor Ambarus <tudor.ambarus@microchip.com>, linux-mtd@lists.infradead.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH] mtd: rawnand: Add a check in of_get_nand_secure_regions() Date: Sat, 24 Jul 2021 21:33:08 +0530 [thread overview] Message-ID: <20210724160308.GA62321@thinkpad> (raw) In-Reply-To: <20210724142712.GA24036@martin-debian-1.paytec.ch> On Sat, Jul 24, 2021 at 04:27:30PM +0200, Martin Kaiser wrote: > Hi all, > > Thus wrote Miquel Raynal (miquel.raynal@bootlin.com): > > > On Thu, 2021-06-17 at 13:37:25 UTC, Dan Carpenter wrote: > > > Check for whether of_property_count_elems_of_size() returns a negative > > > error code. > > > > Fixes: 13b89768275d ("mtd: rawnand: Add support for secure regions in NAND memory") > > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> > > > Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> > > > Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes, thanks. > > I'm running linux-next on an imx25 system with the following flash chip > > [ 1.997539] nand: device found, Manufacturer ID: 0x98, Chip ID: 0xaa > [ 2.004134] nand: Toshiba NAND 256MiB 1,8V 8-bit > [ 2.008917] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 128 > > The system is using the drivers/mtd/nand/raw/mxc_nand.c driver. > > Since this commit appeared in linux-next, mxc_nand's probe function fails > with -EINVAL, taking this path > > mxcnd_probe > nand_scan > nand_scan_with_ids > nand_scan_tail > of_get_nand_secure_regions > > nr_elem = of_property_count_elems_of_size(dn, "secure-regions", sizeof(u64)); > returns -EINVAL as there's no secure-regions property in my device tree. > Doh! Sorry for missing this. > We should certainly handle negative error codes before we calculate > chip->nr_secure_regions = nr_elem / 2 > but a missing secure-regions property is a valid case and should not make > the probe fail. > Absolutely! > If the property exists, but the device-tree entry is incorrect > and of_property_count_elems_of_size returns -ENODATA, we might print a > warning and ignore the entry. > Hmm, I think it is best to error out in this case as the user has got DT wrong. > What do you think? > Since of_property_count_elems_of_size() returns -EINVAL if the length is not a multiple of sizeof(u64), we can't just ignore -EINVAL. So I think we can just check for the existence of the property before invoking of_get_nand_secure_regions(). Miquel, what do you think? Thanks, Mani > Thanks, > > Martin ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2021-07-24 16:03 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-17 13:37 [PATCH] mtd: rawnand: Add a check in of_get_nand_secure_regions() Dan Carpenter 2021-06-17 13:37 ` Dan Carpenter 2021-06-25 9:50 ` Manivannan Sadhasivam 2021-06-25 9:50 ` Manivannan Sadhasivam 2021-07-15 22:50 ` Miquel Raynal 2021-07-15 22:50 ` Miquel Raynal 2021-07-24 14:27 ` Martin Kaiser 2021-07-24 14:27 ` Martin Kaiser 2021-07-24 16:03 ` Manivannan Sadhasivam [this message] 2021-07-24 16:03 ` Manivannan Sadhasivam 2021-07-26 7:58 ` Miquel Raynal 2021-07-26 7:58 ` Miquel Raynal
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