linux-kernel - Re: [PATCH 2/6] UBI: Fastmap: Don't allocate new ubi_wl

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Message-ID: <54845B03.6080706@codeaurora.org>
Date:	Sun, 07 Dec 2014 15:49:55 +0200
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	Richard Weinberger <richard@....at>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] UBI: Fastmap: Don't allocate new ubi_wl_entry objects

On 11/30/2014 1:35 PM, Richard Weinberger wrote:
> There is no need to allocate new ones every time, we can reuse
> the existing ones.
> This makes the code cleaner and more easy to follow.
>
> Signed-off-by: Richard Weinberger <richard@....at>

Reviewed-by: Tanya Brokhman <tlinder@...eaurora.org>

> ---
>   drivers/mtd/ubi/fastmap.c | 31 +++++--------------------------
>   drivers/mtd/ubi/wl.c      | 11 +++++++----
>   2 files changed, 12 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
> index db3defd..9507702 100644
> --- a/drivers/mtd/ubi/fastmap.c
> +++ b/drivers/mtd/ubi/fastmap.c
> @@ -1446,19 +1446,6 @@ int ubi_update_fastmap(struct ubi_device *ubi)
>   	}
>
>   	new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
> -
> -	for (i = 0; i < new_fm->used_blocks; i++) {
> -		new_fm->e[i] = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
> -		if (!new_fm->e[i]) {
> -			while (i--)
> -				kfree(new_fm->e[i]);
> -
> -			kfree(new_fm);
> -			mutex_unlock(&ubi->fm_mutex);
> -			return -ENOMEM;
> -		}
> -	}
> -
>   	old_fm = ubi->fm;
>   	ubi->fm = NULL;
>
> @@ -1494,12 +1481,9 @@ int ubi_update_fastmap(struct ubi_device *ubi)
>   				ubi_err(ubi, "could not erase old fastmap PEB");
>   				goto err;
>   			}
> -
> -			new_fm->e[i]->pnum = old_fm->e[i]->pnum;
> -			new_fm->e[i]->ec = old_fm->e[i]->ec;
> +			new_fm->e[i] = old_fm->e[i];
>   		} else {
> -			new_fm->e[i]->pnum = tmp_e->pnum;
> -			new_fm->e[i]->ec = tmp_e->ec;
> +			new_fm->e[i] = tmp_e;
>
>   			if (old_fm)
>   				ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
> @@ -1524,16 +1508,13 @@ int ubi_update_fastmap(struct ubi_device *ubi)
>   							  i, 0);
>   				goto err;
>   			}
> -
> -			new_fm->e[0]->pnum = old_fm->e[0]->pnum;
> +			new_fm->e[0] = old_fm->e[0];
>   			new_fm->e[0]->ec = ret;
>   		} else {
>   			/* we've got a new anchor PEB, return the old one */
>   			ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
>   					  old_fm->to_be_tortured[0]);
> -
> -			new_fm->e[0]->pnum = tmp_e->pnum;
> -			new_fm->e[0]->ec = tmp_e->ec;
> +			new_fm->e[0] = tmp_e;
>   		}
>   	} else {
>   		if (!tmp_e) {
> @@ -1546,9 +1527,7 @@ int ubi_update_fastmap(struct ubi_device *ubi)
>   			ret = -ENOSPC;
>   			goto err;
>   		}
> -
> -		new_fm->e[0]->pnum = tmp_e->pnum;
> -		new_fm->e[0]->ec = tmp_e->ec;
> +		new_fm->e[0] = tmp_e;
>   	}
>
>   	down_write(&ubi->work_sem);
> diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
> index 47b215f..523d8a4 100644
> --- a/drivers/mtd/ubi/wl.c
> +++ b/drivers/mtd/ubi/wl.c
> @@ -1014,9 +1014,6 @@ int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *fm_e,
>   		e = fm_e;
>   		ubi_assert(e->ec >= 0);
>   		ubi->lookuptbl[pnum] = e;
> -	} else {
> -		e->ec = fm_e->ec;
> -		kfree(fm_e);
>   	}
>
>   	spin_unlock(&ubi->wl_lock);
> @@ -2008,9 +2005,15 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
>
>   	dbg_wl("found %i PEBs", found_pebs);
>
> -	if (ubi->fm)
> +	if (ubi->fm) {
>   		ubi_assert(ubi->good_peb_count == \
>   			   found_pebs + ubi->fm->used_blocks);
> +
> +		for (i = 0; i < ubi->fm->used_blocks; i++) {
> +			e = ubi->fm->e[i];
> +			ubi->lookuptbl[e->pnum] = e;
> +		}
> +	}
>   	else
>   		ubi_assert(ubi->good_peb_count == found_pebs);
>
>


Thanks,
Tanya Brokhman
-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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