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ipc/mqueue.c: fix mq_open() return value
commit d40dcdb0172a1ba853464983a059fb45e0aaf61a upstream. We return ENOMEM from mqueue_get_inode even when we have enough memory. Namely in case the system rlimit of mqueue was reached. This error propagates to mq_queue and user sees the error unexpectedly. So fix this up to properly return EMFILE as described in the manpage: EMFILE The process already has the maximum number of files and message queues open. instead of: ENOMEM Insufficient memory. With the previous patch we just switch to ERR_PTR/PTR_ERR/IS_ERR error handling here. Signed-off-by: Jiri Slaby <firstname.lastname@example.org> Cc: Manfred Spraul <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com> Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
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