x86/ioperm: Avoid bitmap allocation if no permissions are set

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If ioperm() is invoked the first time and the @turn_on argument is 0, then
there is no point to allocate a bitmap just to clear permissions which are
not set.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Thomas Gleixner 2019-11-12 19:56:19 +01:00

parent ae31cea86a

commit 32f3bf67ee

1 changed files with 3 additions and 0 deletions

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arch/x86/kernel/ioport.c

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