AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

[MTD] [NAND] fix possible Ooops in rfc_from4

Browse Source 
I found this while I was looking how the rs_lib is working.  The rs_decoder is
initialized _after_ the nand core code read the BBT table and _after_ the
partition table has been added.  The driver has a private BBT description
which is in located in flash data so we Ooops if there is a bit flip _or_ if a
bit flips while reading the partition table.

This patch moves the initialization of the rs_lib before the first possible
access by nand core.

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jörn Engel <joern@wh.fh-wedel.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Sebastian Siewior 2008-04-18 13:44:24 -07:00 committed by David Woodhouse
parent cb53b3b999
commit c27e9b80be
1 changed files with 29 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/mtd/nand/rtc_from4.c
View File

@ -478,6 +478,7 @@ static int __init rtc_from4_init(void)
struct nand_chip *this;
unsigned short bcr1, bcr2, wcr2;
int i;
int ret;
/* Allocate memory for MTD device structure and private data */
rtc_from4_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
@ -537,6 +538,22 @@ static int __init rtc_from4_init(void)
this->ecc.hwctl = rtc_from4_enable_hwecc;
this->ecc.calculate = rtc_from4_calculate_ecc;
this->ecc.correct = rtc_from4_correct_data;
/* We could create the decoder on demand, if memory is a concern.
* This way we have it handy, if an error happens
*
* Symbolsize is 10 (bits)
* Primitve polynomial is x^10+x^3+1
* first consecutive root is 0
* primitve element to generate roots = 1
* generator polinomial degree = 6
*/
rs_decoder = init_rs(10, 0x409, 0, 1, 6);
if (!rs_decoder) {
printk(KERN_ERR "Could not create a RS decoder\n");
ret = -ENOMEM;
goto err_1;
}
#else
printk(KERN_INFO "rtc_from4_init: using software ECC detection.\n");
@ -549,8 +566,8 @@ static int __init rtc_from4_init(void)
/* Scan to find existence of the device */
if (nand_scan(rtc_from4_mtd, RTC_FROM4_MAX_CHIPS)) {
kfree(rtc_from4_mtd);
return -ENXIO;
ret = -ENXIO;
goto err_2;
}
/* Perform 'device recovery' for each chip in case there was a power loss. */
@ -566,28 +583,19 @@ static int __init rtc_from4_init(void)
#endif
/* Register the partitions */
add_mtd_partitions(rtc_from4_mtd, partition_info, NUM_PARTITIONS);
ret = add_mtd_partitions(rtc_from4_mtd, partition_info, NUM_PARTITIONS);
if (ret)
goto err_3;
#ifdef RTC_FROM4_HWECC
/* We could create the decoder on demand, if memory is a concern.
* This way we have it handy, if an error happens
*
* Symbolsize is 10 (bits)
* Primitve polynomial is x^10+x^3+1
* first consecutive root is 0
* primitve element to generate roots = 1
* generator polinomial degree = 6
*/
rs_decoder = init_rs(10, 0x409, 0, 1, 6);
if (!rs_decoder) {
printk(KERN_ERR "Could not create a RS decoder\n");
nand_release(rtc_from4_mtd);
kfree(rtc_from4_mtd);
return -ENOMEM;
}
#endif
/* Return happy */
return 0;
err_3:
nand_release(rtc_from4_mtd);
err_2:
free_rs(rs_decoder);
err_1:
kfree(rtc_from4_mtd);
return ret;
}
module_init(rtc_from4_init);