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authorDavidlohr Bueso <dave@stgolabs.net>2015-11-06 16:33:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit5f2a2d5d423d5337a1392fa016ec23a8a4206006 (patch)
tree644e89ea4f70339d6b8f3dddc76132a1f90f8e62 /lib
parentcb7ae262e230064ba282094b7e1f60a092448b72 (diff)
downloadlinux-5f2a2d5d423d5337a1392fa016ec23a8a4206006.tar.bz2
ipc,msg: drop dst nil validation in copy_msg
d0edd8528362 ("ipc: convert invalid scenarios to use WARN_ON") relaxed the nil dst parameter check, originally being a full BUG_ON. However, this check seems quite unnecessary when the only purpose is for ceckpoint/restore (MSG_COPY flag): o The copy variable is set initially to nil, apparently as a way of ensuring that prepare_copy is previously called. Which is in fact done, unconditionally at the beginning of do_msgrcv. o There is no concurrency with 'copy' (stack allocated in do_msgrcv). Furthermore, any errors in 'copy' (and thus prepare_copy/copy_msg) should always handled by IS_ERR() family. Therefore remove this check altogether as it can never occur with the current users. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
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