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[MTD] NAND: Check command timeout 

Check timeout while we wait for the command to finish. No worry about a
false result. This prevents deadlocking when detecting an unknown number
of chips and is useful for removable media too.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2005-02-22 21:56:49 +00:00 committed by Thomas Gleixner
parent dfd6129440
commit 3b88775c75
1 changed files with 26 additions and 11 deletions
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35
drivers/mtd/nand/nand_base.c
View File

@ -59,7 +59,7 @@
* The AG-AND chips have nice features for speed improvement, * The AG-AND chips have nice features for speed improvement,
* which are not supported yet. Read / program 4 pages in one go. * which are not supported yet. Read / program 4 pages in one go.
* *
* $Id: nand_base.c,v 1.133 2005/02/16 09:39:35 gleixner Exp $ * $Id: nand_base.c,v 1.134 2005/02/22 21:56:46 gleixner Exp $
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as * it under the terms of the GNU General Public License version 2 as
@ -509,6 +509,22 @@ static int nand_block_checkbad (struct mtd_info *mtd, loff_t ofs, int getchip, i
return nand_isbad_bbt (mtd, ofs, allowbbt); return nand_isbad_bbt (mtd, ofs, allowbbt);
} }
/*
* Wait for the ready pin, after a command
* The timeout is catched later.
*/
static void nand_wait_ready(struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
unsigned long timeo = jiffies + 2;
/* wait until command is processed or timeout occures */
do {
if (this->dev_ready(mtd))
return;
} while (time_before(jiffies, timeo));
}
/** /**
* nand_command - [DEFAULT] Send command to NAND device * nand_command - [DEFAULT] Send command to NAND device
* @mtd: MTD device structure * @mtd: MTD device structure
@ -604,12 +620,11 @@ static void nand_command (struct mtd_info *mtd, unsigned command, int column, in
return; return;
} }
} }
/* Apply this short delay always to ensure that we do wait tWB in /* Apply this short delay always to ensure that we do wait tWB in
* any case on any machine. */ * any case on any machine. */
ndelay (100); ndelay (100);
/* wait until command is processed */
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
} }
/** /**
@ -724,8 +739,8 @@ static void nand_command_lp (struct mtd_info *mtd, unsigned command, int column,
/* Apply this short delay always to ensure that we do wait tWB in /* Apply this short delay always to ensure that we do wait tWB in
* any case on any machine. */ * any case on any machine. */
ndelay (100); ndelay (100);
/* wait until command is processed */
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
} }
/** /**
@ -1011,7 +1026,7 @@ static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int
if (!this->dev_ready) if (!this->dev_ready)
udelay (this->chip_delay); udelay (this->chip_delay);
else else
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
/* All done, return happy */ /* All done, return happy */
if (!numpages) if (!numpages)
@ -1302,7 +1317,7 @@ int nand_do_read_ecc (struct mtd_info *mtd, loff_t from, size_t len,
if (!this->dev_ready) if (!this->dev_ready)
udelay (this->chip_delay); udelay (this->chip_delay);
else else
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
if (read == len) if (read == len)
break; break;
@ -1401,7 +1416,7 @@ static int nand_read_oob (struct mtd_info *mtd, loff_t from, size_t len, size_t
if (!this->dev_ready) if (!this->dev_ready)
udelay (this->chip_delay); udelay (this->chip_delay);
else else
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
/* Read more ? */ /* Read more ? */
if (i < len) { if (i < len) {
@ -1481,7 +1496,7 @@ int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from, size_t len,
if (!this->dev_ready) if (!this->dev_ready)
udelay (this->chip_delay); udelay (this->chip_delay);
else else
while (!this->dev_ready(mtd)); nand_wait_ready(mtd);
/* Check, if the chip supports auto page increment */ /* Check, if the chip supports auto page increment */
if (!NAND_CANAUTOINCR(this) || !(page & blockcheck)) if (!NAND_CANAUTOINCR(this) || !(page & blockcheck))