https://github.com/torvalds/linux
Revision 59ceeaaf355fa0fb16558ef7c24413c804932ada authored by Simon Guinot on 09 September 2015, 22:15:18 UTC, committed by Linus Torvalds on 20 February 2016, 16:57:52 UTC
In __request_region, if a conflict with a BUSY and MUXED resource is detected, then the caller goes to sleep and waits for the resource to be released. A pointer on the conflicting resource is kept. At wake-up this pointer is used as a parent to retry to request the region. A first problem is that this pointer might well be invalid (if for example the conflicting resource have already been freed). Another problem is that the next call to __request_region() fails to detect a remaining conflict. The previously conflicting resource is passed as a parameter and __request_region() will look for a conflict among the children of this resource and not at the resource itself. It is likely to succeed anyway, even if there is still a conflict. Instead, the parent of the conflicting resource should be passed to __request_region(). As a fix, this patch doesn't update the parent resource pointer in the case we have to wait for a muxed region right after. Reported-and-tested-by: Vincent Pelletier <plr.vincent@gmail.com> Signed-off-by: Simon Guinot <simon.guinot@sequanux.org> Tested-by: Vincent Donnefort <vdonnefort@gmail.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 020ecbb
Tip revision: 59ceeaaf355fa0fb16558ef7c24413c804932ada authored by Simon Guinot on 09 September 2015, 22:15:18 UTC
kernel/resource.c: fix muxed resource handling in __request_region()
kernel/resource.c: fix muxed resource handling in __request_region()
Tip revision: 59ceeaa
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