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arm64: fix return code check when changing emulation handler 

update_insn_emulation_mode() returns 0 on success, so we should be
treating any non-zero values as failure, rather than the other way
around. Otherwise, writes to the sysctl file controlling the emulation
are ignored and immediately rolled back.

Reported-by: Gene Hackmann <ghackmann@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-11-25 10:05:35 +00:00
parent 7f73f7aef8
commit 909633957d
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/armv8_deprecated.c
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@ -165,7 +165,7 @@ static int emulation_proc_handler(struct ctl_table *table, int write,
goto ret;
ret = update_insn_emulation_mode(insn, prev_mode);
if (!ret) {
if (ret) {
/* Mode change failed, revert to previous mode. */
insn->current_mode = prev_mode;
update_insn_emulation_mode(insn, INSN_UNDEF);