| Message ID | 20210727045222.905056-3-tudor.ambarus@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mtd: spi-nor: Handle ID collisions and clean params init | expand |
On 27/07/21 07:51AM, Tudor Ambarus wrote: > Provide a way to report the correct flash name in case of ID collisions. > There will be a single flash_info entry when flash IDs collide, and the > differentiation between the flash types will be made at runtime > if possible. I have the same comments as last time around. I am not convinced that this approach is better than having multiple entries, one for each colliding flash. I wonder how you will handle different fixups for the colliding flashes for example, since nor->info is const. Maybe I will change my mind once I read through the rest of the series, in which case I will report back here. > > Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> > --- > drivers/mtd/spi-nor/core.c | 7 +++++-- > drivers/mtd/spi-nor/sysfs.c | 2 +- > include/linux/mtd/spi-nor.h | 2 ++ > 3 files changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c > index 3d9f3698fb7b..1a278d33b02d 100644 > --- a/drivers/mtd/spi-nor/core.c > +++ b/drivers/mtd/spi-nor/core.c > @@ -3027,7 +3027,7 @@ static void spi_nor_debugfs_init(struct spi_nor *nor, > { > struct mtd_info *mtd = &nor->mtd; > > - mtd->dbg.partname = info->name; > + mtd->dbg.partname = nor->name; > mtd->dbg.partid = devm_kasprintf(nor->dev, GFP_KERNEL, "spi-nor:%*phN", > info->id_len, info->id); > } > @@ -3208,7 +3208,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, > /* Configure OTP parameters and ops */ > spi_nor_otp_init(nor); > > - dev_info(dev, "%s (%lld Kbytes)\n", info->name, > + if (!nor->name) > + nor->name = info->name; > + > + dev_info(dev, "%s (%lld Kbytes)\n", nor->name, > (long long)mtd->size >> 10); > > dev_dbg(dev, > diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c > index 9aec9d8a98ad..017119768f32 100644 > --- a/drivers/mtd/spi-nor/sysfs.c > +++ b/drivers/mtd/spi-nor/sysfs.c > @@ -25,7 +25,7 @@ static ssize_t partname_show(struct device *dev, > struct spi_mem *spimem = spi_get_drvdata(spi); > struct spi_nor *nor = spi_mem_get_drvdata(spimem); > > - return sysfs_emit(buf, "%s\n", nor->info->name); > + return sysfs_emit(buf, "%s\n", nor->name); > } > static DEVICE_ATTR_RO(partname); > > diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h > index f67457748ed8..bd92acdd1899 100644 > --- a/include/linux/mtd/spi-nor.h > +++ b/include/linux/mtd/spi-nor.h > @@ -369,6 +369,7 @@ struct spi_nor_flash_parameter; > * @bouncebuf: bounce buffer used when the buffer passed by the MTD > * layer is not DMA-able > * @bouncebuf_size: size of the bounce buffer > + * @name: used to point to correct name in case of ID collisions. > * @info: SPI NOR part JEDEC MFR ID and other info > * @manufacturer: SPI NOR manufacturer > * @page_size: the page size of the SPI NOR > @@ -399,6 +400,7 @@ struct spi_nor { > struct spi_mem *spimem; > u8 *bouncebuf; > size_t bouncebuf_size; > + const char *name; > const struct flash_info *info; > const struct spi_nor_manufacturer *manufacturer; > u32 page_size; > -- > 2.25.1 >
Am 2021-08-04 10:23, schrieb Pratyush Yadav: > On 27/07/21 07:51AM, Tudor Ambarus wrote: >> Provide a way to report the correct flash name in case of ID >> collisions. >> There will be a single flash_info entry when flash IDs collide, and >> the >> differentiation between the flash types will be made at runtime >> if possible. > > I have the same comments as last time around. I am not convinced that > this approach is better than having multiple entries, one for each > colliding flash. I wonder how you will handle different fixups for the > colliding flashes for example, since nor->info is const. I thought of multple entries in xx_parts[], too. But how would you choose between those? The flash id is the same, only the name would be different. Searching by name seems cumbersome. Also, the fixup of the first match will change the pointer (or maybe an additional pointer, so we still have the original match), and thus also changes the pointer to the fixup itself. -michael
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 3d9f3698fb7b..1a278d33b02d 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -3027,7 +3027,7 @@ static void spi_nor_debugfs_init(struct spi_nor *nor, { struct mtd_info *mtd = &nor->mtd; - mtd->dbg.partname = info->name; + mtd->dbg.partname = nor->name; mtd->dbg.partid = devm_kasprintf(nor->dev, GFP_KERNEL, "spi-nor:%*phN", info->id_len, info->id); } @@ -3208,7 +3208,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, /* Configure OTP parameters and ops */ spi_nor_otp_init(nor); - dev_info(dev, "%s (%lld Kbytes)\n", info->name, + if (!nor->name) + nor->name = info->name; + + dev_info(dev, "%s (%lld Kbytes)\n", nor->name, (long long)mtd->size >> 10); dev_dbg(dev, diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c index 9aec9d8a98ad..017119768f32 100644 --- a/drivers/mtd/spi-nor/sysfs.c +++ b/drivers/mtd/spi-nor/sysfs.c @@ -25,7 +25,7 @@ static ssize_t partname_show(struct device *dev, struct spi_mem *spimem = spi_get_drvdata(spi); struct spi_nor *nor = spi_mem_get_drvdata(spimem); - return sysfs_emit(buf, "%s\n", nor->info->name); + return sysfs_emit(buf, "%s\n", nor->name); } static DEVICE_ATTR_RO(partname); diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index f67457748ed8..bd92acdd1899 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -369,6 +369,7 @@ struct spi_nor_flash_parameter; * @bouncebuf: bounce buffer used when the buffer passed by the MTD * layer is not DMA-able * @bouncebuf_size: size of the bounce buffer + * @name: used to point to correct name in case of ID collisions. * @info: SPI NOR part JEDEC MFR ID and other info * @manufacturer: SPI NOR manufacturer * @page_size: the page size of the SPI NOR @@ -399,6 +400,7 @@ struct spi_nor { struct spi_mem *spimem; u8 *bouncebuf; size_t bouncebuf_size; + const char *name; const struct flash_info *info; const struct spi_nor_manufacturer *manufacturer; u32 page_size;
Provide a way to report the correct flash name in case of ID collisions. There will be a single flash_info entry when flash IDs collide, and the differentiation between the flash types will be made at runtime if possible. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> --- drivers/mtd/spi-nor/core.c | 7 +++++-- drivers/mtd/spi-nor/sysfs.c | 2 +- include/linux/mtd/spi-nor.h | 2 ++ 3 files changed, 8 insertions(+), 3 deletions(-)