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Date: Wed, 25 Jul 2018 18:42:44 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Wenyou Yang <wenyou.yang@...rochip.com>,
Josh Wu <rainyfeeling@...look.com>,
Tudor Ambarus <Tudor.Ambarus@...rochip.com>,
Boris Brezillon <boris.brezillon@...tlin.com>,
Richard Weinberger <richard@....at>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Kamal Dasu <kdasu.kdev@...il.com>, Han Xu <han.xu@....com>,
Harvey Hunt <harveyhuntnexus@...il.com>,
Vladimir Zapolskiy <vz@...ia.com>,
Sylvain Lemieux <slemieux.tyco@...il.com>,
Xiaolei Li <xiaolei.li@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Chen-Yu Tsai <wens@...e.org>,
Marc Gonzalez <marc.w.gonzalez@...e.fr>,
Mans Rullgard <mans@...sr.com>, Stefan Agner <stefan@...er.ch>,
Broadcom Kernel Feedback List
<bcm-kernel-feedback-list@...adcom.com>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
linux-mtd <linux-mtd@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 04/35] mtd: rawnand: denali: convert to nand_scan()
Hi.
2018-07-21 0:14 GMT+09:00 Miquel Raynal <miquel.raynal@...tlin.com>:
> Two helpers have been added to the core to make ECC-related
> configuration between the detection phase and the final NAND scan. Use
> these hooks and convert the driver to just use nand_scan() instead of
> both nand_scan_ident() and nand_scan_tail().
>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
> drivers/mtd/nand/raw/denali.c | 138 +++++++++++++++++++++++-------------------
> 1 file changed, 77 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
> index 4d53f41ada08..2fa92c297a66 100644
> --- a/drivers/mtd/nand/raw/denali.c
> +++ b/drivers/mtd/nand/raw/denali.c
> @@ -1205,62 +1205,12 @@ static int denali_multidev_fixup(struct denali_nand_info *denali)
> return 0;
> }
>
> -int denali_init(struct denali_nand_info *denali)
> +static int denali_attach_chip(struct nand_chip *chip)
> {
> - struct nand_chip *chip = &denali->nand;
> struct mtd_info *mtd = nand_to_mtd(chip);
> - u32 features = ioread32(denali->reg + FEATURES);
> + struct denali_nand_info *denali = mtd_to_denali(mtd);
> int ret;
>
> - mtd->dev.parent = denali->dev;
> - denali_hw_init(denali);
> -
> - init_completion(&denali->complete);
> - spin_lock_init(&denali->irq_lock);
> -
> - denali_clear_irq_all(denali);
> -
> - ret = devm_request_irq(denali->dev, denali->irq, denali_isr,
> - IRQF_SHARED, DENALI_NAND_NAME, denali);
> - if (ret) {
> - dev_err(denali->dev, "Unable to request IRQ\n");
> - return ret;
> - }
> -
> - denali_enable_irq(denali);
> - denali_reset_banks(denali);
> -
> - denali->active_bank = DENALI_INVALID_BANK;
> -
> - nand_set_flash_node(chip, denali->dev->of_node);
> - /* Fallback to the default name if DT did not give "label" property */
> - if (!mtd->name)
> - mtd->name = "denali-nand";
> -
> - chip->select_chip = denali_select_chip;
> - chip->read_byte = denali_read_byte;
> - chip->write_byte = denali_write_byte;
> - chip->read_word = denali_read_word;
> - chip->cmd_ctrl = denali_cmd_ctrl;
> - chip->dev_ready = denali_dev_ready;
> - chip->waitfunc = denali_waitfunc;
> -
> - if (features & FEATURES__INDEX_ADDR) {
> - denali->host_read = denali_indexed_read;
> - denali->host_write = denali_indexed_write;
> - } else {
> - denali->host_read = denali_direct_read;
> - denali->host_write = denali_direct_write;
> - }
> -
> - /* clk rate info is needed for setup_data_interface */
> - if (denali->clk_rate && denali->clk_x_rate)
> - chip->setup_data_interface = denali_setup_data_interface;
> -
> - ret = nand_scan_ident(mtd, denali->max_banks, NULL);
> - if (ret)
> - goto disable_irq;
> -
> if (ioread32(denali->reg + FEATURES) & FEATURES__DMA)
> denali->dma_avail = 1;
>
> @@ -1293,7 +1243,7 @@ int denali_init(struct denali_nand_info *denali)
> mtd->oobsize - denali->oob_skip_bytes);
> if (ret) {
> dev_err(denali->dev, "Failed to setup ECC settings.\n");
> - goto disable_irq;
> + return ret;
> }
>
> dev_dbg(denali->dev,
> @@ -1337,7 +1287,7 @@ int denali_init(struct denali_nand_info *denali)
>
> ret = denali_multidev_fixup(denali);
> if (ret)
> - goto disable_irq;
> + return ret;
>
> /*
> * This buffer is DMA-mapped by denali_{read,write}_page_raw. Do not
> @@ -1345,26 +1295,92 @@ int denali_init(struct denali_nand_info *denali)
> * guarantee DMA-safe alignment.
> */
> denali->buf = kmalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
> - if (!denali->buf) {
> - ret = -ENOMEM;
> - goto disable_irq;
> + if (!denali->buf)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +static void denali_detach_chip(struct nand_chip *chip)
> +{
> + struct mtd_info *mtd = nand_to_mtd(chip);
> + struct denali_nand_info *denali = mtd_to_denali(mtd);
> +
> + kfree(denali->buf);
> +}
> +
> +static const struct nand_controller_ops denali_controller_ops = {
> + .attach_chip = denali_attach_chip,
> + .detach_chip = denali_detach_chip,
> +};
> +
> +int denali_init(struct denali_nand_info *denali)
> +{
> + struct nand_chip *chip = &denali->nand;
> + struct mtd_info *mtd = nand_to_mtd(chip);
> + u32 features = ioread32(denali->reg + FEATURES);
> + int ret;
> +
> + mtd->dev.parent = denali->dev;
> + denali_hw_init(denali);
> +
> + init_completion(&denali->complete);
> + spin_lock_init(&denali->irq_lock);
> +
> + denali_clear_irq_all(denali);
> +
> + ret = devm_request_irq(denali->dev, denali->irq, denali_isr,
> + IRQF_SHARED, DENALI_NAND_NAME, denali);
> + if (ret) {
> + dev_err(denali->dev, "Unable to request IRQ\n");
> + return ret;
> + }
> +
> + denali_enable_irq(denali);
> + denali_reset_banks(denali);
> +
> + denali->active_bank = DENALI_INVALID_BANK;
> +
> + nand_set_flash_node(chip, denali->dev->of_node);
> + /* Fallback to the default name if DT did not give "label" property */
> + if (!mtd->name)
> + mtd->name = "denali-nand";
> +
> + chip->select_chip = denali_select_chip;
> + chip->read_byte = denali_read_byte;
> + chip->write_byte = denali_write_byte;
> + chip->read_word = denali_read_word;
> + chip->cmd_ctrl = denali_cmd_ctrl;
> + chip->dev_ready = denali_dev_ready;
> + chip->waitfunc = denali_waitfunc;
> +
> + if (features & FEATURES__INDEX_ADDR) {
> + denali->host_read = denali_indexed_read;
> + denali->host_write = denali_indexed_write;
> + } else {
> + denali->host_read = denali_direct_read;
> + denali->host_write = denali_direct_write;
> }
>
> - ret = nand_scan_tail(mtd);
> + /* clk rate info is needed for setup_data_interface */
> + if (denali->clk_rate && denali->clk_x_rate)
> + chip->setup_data_interface = denali_setup_data_interface;
> +
> + chip->dummy_controller.ops = &denali_controller_ops;
> + ret = nand_scan(mtd, denali->max_banks);
> if (ret)
> - goto free_buf;
> + goto disable_irq;
>
> ret = mtd_device_register(mtd, NULL, 0);
> if (ret) {
> dev_err(denali->dev, "Failed to register MTD: %d\n", ret);
> goto cleanup_nand;
> }
> +
> return 0;
>
> cleanup_nand:
> nand_cleanup(chip);
> -free_buf:
> - kfree(denali->buf);
> disable_irq:
> denali_disable_irq(denali);
>
> --
> 2.14.1
>
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
You need to remove kfree(denali->buf)
from denali_remove(), right?
void denali_remove(struct denali_nand_info *denali)
{
struct mtd_info *mtd = nand_to_mtd(&denali->nand);
nand_release(mtd);
kfree(denali->buf); <---- REMOVE !!
denali_disable_irq(denali);
}
Otherwise, denali_remove() will free denali->buf twice
because kfree(denali->buf) is called from denali_detach_chip().
--
Best Regards
Masahiro Yamada
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