diff options
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index fdaf32083ad..42cff0a2b93 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -69,6 +69,7 @@ * */ +#include <linux/module.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/sched.h> @@ -2316,11 +2317,12 @@ static void nand_resume(struct mtd_info *mtd) * @mtd: MTD device structure * @maxchips: Number of chips to scan for * - * This fills out all the not initialized function pointers + * This fills out all the uninitialized function pointers * with the defaults. * The flash ID is read and the mtd/chip structures are * filled with the appropriate values. Buffers are allocated if * they are not provided by the board driver + * The mtd->owner field must be set to the module of the caller * */ int nand_scan(struct mtd_info *mtd, int maxchips) @@ -2328,6 +2330,16 @@ int nand_scan(struct mtd_info *mtd, int maxchips) int i, nand_maf_id, nand_dev_id, busw, maf_id; struct nand_chip *this = mtd->priv; + /* module_text_address() isn't exported. But if _this_ is a module, + it's a fairly safe bet that its caller is a module too... and + that means the call to module_text_address() gets optimised out + without having to resort to ifdefs */ + if (!mtd->owner && (THIS_MODULE || + module_text_address((unsigned long)__builtin_return_address(0)))) { + printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n"); + BUG(); + } + /* Get buswidth to select the correct functions */ busw = this->options & NAND_BUSWIDTH_16; @@ -2676,8 +2688,6 @@ int nand_scan(struct mtd_info *mtd, int maxchips) /* and make the autooob the default one */ memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo)); - mtd->owner = THIS_MODULE; - /* Check, if we should skip the bad block table scan */ if (this->options & NAND_SKIP_BBTSCAN) return 0; |