tree 5a8cb645c5a10182bbd0bb456285d362bcdd6f51
parent 3fa8749e584b55f1180411ab1b51117190bac1e5
author Alexey Dobriyan <adobriyan@gmail.com> 1222978732 +0400
committer Alexey Dobriyan <adobriyan@gmail.com> 1223597934 +0400

proc: fix return value of proc_reg_open() in "too late" case

If ->open() wasn't called, returning 0 is misleading and, theoretically,
oopsable:
1) remove_proc_entry clears ->proc_fops, drops lock,
2) ->open "succeeds",
3) ->release oopses, because it assumes ->open was called (single_release()).

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>