[v6,02/11] mtd: cfi_cmdset_0002: Remove goto statement from do_write_buffer()
diff mbox series

Message ID 20190526153904.28871-3-ikegami.t@gmail.com
State Changes Requested
Delegated to: Vignesh R
Headers show
Series
  • mtd: cfi_cmdset_0002: Fix flash write issue for OpenWrt Project
Related show

Commit Message

Tokunori Ikegami May 26, 2019, 3:38 p.m. UTC
For a maintainability by reducing the goto statement remove it from
do_write_buffer().

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
Cc: Fabio Bettoni <fbettoni@gmail.com>
Co: Hauke Mehrtens <hauke@hauke-m.de>
Co: Koen Vandeputte <koen.vandeputte@ncentric.com>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: linux-mtd@lists.infradead.org
---
Changes since v5:
- Rebased on top of Liu Jian's fixes in master.
- Change the email address of Tokunori Ikegami to ikegami.t@gmail.com.

Changes since v4:
- None.

Changes since v3:
- Just change the email address of Tokunori Ikegami to ikegami_to@yahoo.co.jp.

Changes since v2:
- None.

Changes since v1:
- Split the patch v1 3/3.

 drivers/mtd/chips/cfi_cmdset_0002.c | 46 +++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

Comments

Vignesh Raghavendra June 15, 2019, 1:42 p.m. UTC | #1
On 26-May-19 9:08 PM, Tokunori Ikegami wrote:
> For a maintainability by reducing the goto statement remove it from
> do_write_buffer().
> 
> Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
> Cc: Fabio Bettoni <fbettoni@gmail.com>
> Co: Hauke Mehrtens <hauke@hauke-m.de>
> Co: Koen Vandeputte <koen.vandeputte@ncentric.com>
> Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
> Cc: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
> Cc: linux-mtd@lists.infradead.org
> ---
[...]
>  drivers/mtd/chips/cfi_cmdset_0002.c | 46 +++++++++++++++++++------------------
>  1 file changed, 24 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
> index 348b54820e4c..ca41f47c00c1 100755
> --- a/drivers/mtd/chips/cfi_cmdset_0002.c
> +++ b/drivers/mtd/chips/cfi_cmdset_0002.c
> @@ -1887,40 +1887,42 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
>  		 * We check "time_after" and "!chip_good" before checking "chip_good" to avoid
>  		 * the failure due to scheduling.
>  		 */
> -		if (time_after(jiffies, timeo) && !chip_good(map, adr, datum))
> +		if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) {
> +			ret = -EIO;
>  			break;
> +		}
>  
>  		if (chip_good(map, adr, datum)) {
>  			xip_enable(map, chip, adr);
> -			goto op_done;
> +			break;
>  		}
>  
>  		/* Latency issues. Drop the lock, wait a while and retry */
>  		UDELAY(map, chip, adr, 1);
>  	}
>  
> -	/*
> -	 * Recovery from write-buffer programming failures requires
> -	 * the write-to-buffer-reset sequence.  Since the last part
> -	 * of the sequence also works as a normal reset, we can run
> -	 * the same commands regardless of why we are here.
> -	 * See e.g.
> -	 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf
> -	 */
> -	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
> -			 cfi->device_type, NULL);
> -	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
> -			 cfi->device_type, NULL);
> -	cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,
> -			 cfi->device_type, NULL);
> -	xip_enable(map, chip, adr);
> -	/* FIXME - should have reset delay before continuing */
> +	if (ret) {
> +		/*
> +		 * Recovery from write-buffer programming failures requires
> +		 * the write-to-buffer-reset sequence.  Since the last part
> +		 * of the sequence also works as a normal reset, we can run
> +		 * the same commands regardless of why we are here.
> +		 * See e.g.
> +		 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf
> +		 */
> +		cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
> +				 cfi->device_type, NULL);
> +		cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
> +				 cfi->device_type, NULL);
> +		cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,
> +				 cfi->device_type, NULL);
> +		xip_enable(map, chip, adr);
> +		/* FIXME - should have reset delay before continuing */
>  
> -	printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",
> -	       __func__, adr);
> +		printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",
> +		       __func__, adr);
> +	}
>  

While at that, could you convert this to pr_err()?

> -	ret = -EIO;
> - op_done:
>  	chip->state = FL_READY;
>  	DISABLE_VPP(map);
>  	put_chip(map, chip, adr);
>

Patch
diff mbox series

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 348b54820e4c..ca41f47c00c1 100755
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -1887,40 +1887,42 @@  static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
 		 * We check "time_after" and "!chip_good" before checking "chip_good" to avoid
 		 * the failure due to scheduling.
 		 */
-		if (time_after(jiffies, timeo) && !chip_good(map, adr, datum))
+		if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) {
+			ret = -EIO;
 			break;
+		}
 
 		if (chip_good(map, adr, datum)) {
 			xip_enable(map, chip, adr);
-			goto op_done;
+			break;
 		}
 
 		/* Latency issues. Drop the lock, wait a while and retry */
 		UDELAY(map, chip, adr, 1);
 	}
 
-	/*
-	 * Recovery from write-buffer programming failures requires
-	 * the write-to-buffer-reset sequence.  Since the last part
-	 * of the sequence also works as a normal reset, we can run
-	 * the same commands regardless of why we are here.
-	 * See e.g.
-	 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf
-	 */
-	cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
-			 cfi->device_type, NULL);
-	cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
-			 cfi->device_type, NULL);
-	cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,
-			 cfi->device_type, NULL);
-	xip_enable(map, chip, adr);
-	/* FIXME - should have reset delay before continuing */
+	if (ret) {
+		/*
+		 * Recovery from write-buffer programming failures requires
+		 * the write-to-buffer-reset sequence.  Since the last part
+		 * of the sequence also works as a normal reset, we can run
+		 * the same commands regardless of why we are here.
+		 * See e.g.
+		 * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf
+		 */
+		cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+				 cfi->device_type, NULL);
+		cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+				 cfi->device_type, NULL);
+		cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,
+				 cfi->device_type, NULL);
+		xip_enable(map, chip, adr);
+		/* FIXME - should have reset delay before continuing */
 
-	printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",
-	       __func__, adr);
+		printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",
+		       __func__, adr);
+	}
 
-	ret = -EIO;
- op_done:
 	chip->state = FL_READY;
 	DISABLE_VPP(map);
 	put_chip(map, chip, adr);