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sh: pfc: Verify pin type encoding size at build time.

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The encoding is tightly packed, and future changes (such as
pinconf-generic support) can easily lead to a situation where we violate
the encoding constraints and trample data bit/reg bits. This plugs in
some sanity checks by way of a BUILD_BUG_ON() to blow up if we fail to
fit.

Signed-off-by: Paul Mundt <[email protected]>
This commit is contained in:
Paul Mundt 2012-06-21 00:03:41 +09:00
commit 06d5631f56
2 changed files with 19 additions and 9 deletions
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5
drivers/sh/pfc.c
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@ -549,6 +549,11 @@ int register_sh_pfc(struct sh_pfc *pfc)
int (*initroutine)(struct sh_pfc *) = NULL;
int ret;
/*
* Ensure that the type encoding fits
*/
BUILD_BUG_ON(PINMUX_FLAG_TYPE > ((1 << PINMUX_FLAG_DBIT_SHIFT) - 1));
if (sh_pfc)
return -EBUSY;