From: Yinghai Lu Date: Sat, 19 Feb 2011 19:07:37 +0000 (-0800) Subject: genirq: Use IRQ_BITMAP_BITS as search size in irq_alloc_descs() X-Git-Tag: v2.6.39-rc1~503^2~9^2~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed4dea6e0e33a3e58d8b77b775a8f0e433e7a005;p=pandora-kernel.git genirq: Use IRQ_BITMAP_BITS as search size in irq_alloc_descs() The runtime expansion of nr_irqs does not take into account that bitmap_find_next_zero_area() returns "start" + size in case the search for an matching zero area fails. That results in a start value which can be completely off and is not covered by the following expand_nr_irqs() and possibly outside of the absolute limit. But we use it without further checking. Use IRQ_BITMAP_BITS as the limit for the bitmap search and expand nr_irqs when the start bit is beyond nr_irqs. So start is always pointing to the correct area in the bitmap. nr_irqs is just the limit for irq enumerations, not the real limit for the irq space. [ tglx: Let irq_expand_nr_irqs() take the new upper end so we do not expand nr_irqs more than necessary. Made changelog readable ] Signed-off-by: Yinghai Lu LKML-Reference: <4D6014F9.8040605@kernel.org> Signed-off-by: Thomas Gleixner --- Reading git-diff-tree failed