[PATCH 05/25] OMAP4: Use WARN_ON() instead of BUG_ON() with graceful exit

On Monday 05 September 2011 04:17 PM, Russell King - ARM Linux wrote:

On Mon, Sep 05, 2011 at 04:12:02PM +0530, Santosh wrote:

quoted

On Monday 05 September 2011 03:41 PM, Sergei Shtylyov wrote:

[..]

quoted

quoted

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/* Static mapping, never released */
l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
- BUG_ON(!l2cache_base);
+ if (WARN_ON(!l2cache_base))
+ return -ENODEV;

Rather ENOMEM...

Nope. Even though it's related to memory, it's
a memory controller so DEV is right.

No it's not.  The most likely reason ioremap() fails is because:

1. it's run out of memory for the metadata or page tables.
2. you passed it an invalid memory type (unlikely, you're using ioremap
    which uses a fixed known good type).
3. the address was>4GB but was not section aligned (also unlikely).

Therefore, the error code should be "out of memory" not "no such device".

Got it. Will fix that.