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[MTD NAND] Modify check for modules registering NAND devices without ->owner

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Make it work even with compilers which lack the wit to notice that
THIS_MODULE is always non-NULL. Use #ifdef MODULE instead. It's only
a temporary debugging check anyway.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2006-05-14 16:54:39 +01:00
parent 0d4e30d26a
commit 52239da1b0
1 changed files with 11 additions and 6 deletions
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17
drivers/mtd/nand/nand_base.c
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@ -2312,6 +2312,15 @@ static void nand_resume(struct mtd_info *mtd)
}
/* module_text_address() isn't exported, and it's mostly a pointless
test if this is a module _anyway_ -- they'd have to try _really_ hard
to call us from in-kernel code if the core NAND support is modular. */
#ifdef MODULE
#define caller_is_module() (1)
#else
#define caller_is_module() module_text_address((unsigned long)__builtin_return_address(0))
#endif
/**
* nand_scan - [NAND Interface] Scan for the NAND device
* @mtd: MTD device structure
@ -2330,12 +2339,8 @@ 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)))) {
/* Many callers got this wrong, so check for it for a while... */
if (!mtd->owner && caller_is_module()) {
printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n");
BUG();
}