On 12/30/2014 09:28 PM, Nicholas Mc Guire wrote:
wait_for_completion_timeout does not return negative values so the tests
for <= 0 are not needed and the case differentiation in the error handling
path unnecessary.
I decided to verify your statement and I saw that it seems wrong.
do_wait_for_common() can return -ERESTARTSYS and the return value gets
returned by its callers unchanged.
the -ERESTARTSYS only can be returned if state matches but
wait_for_completion_timemout passes TASK_UNINTERRUPTIBLE
so signal_pending_state will return 0 and never negativ
my understanding of the callchain is:
wait_for_completion_timemout with TASK_UNINTERRUPTIBLE
-> wait_for_common(...TASK_UNINTERRUPTIBLE)
-> __wait_for_common(...TASK_UNINTERRUPTIBLE)
-> do_wait_for_common(...TASK_UNINTERRUPTIBLE)
-> signal_pending_state(TASK_UNINTERRUPTIBLE...)
static inline int signal_pending_state(long state, struct task_struct *p)
{
if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
return 0;
Right. I didn't look into TASK_UNINTERRUPTIBLE thing before sending my mail.
so wait_for_completion_timemout should return 0 or 1 only
0 or the remaining time, to be precise.
patch was only compile tested x86_64_defconfig + CONFIG_ATH_CARDS=m
CONFIG_ATH10K=m
patch is against linux-next 3.19.0-rc1 -next-20141226
Rather patches. It would have been better to send one patch instead of
4 patches with the same name.
sorry for that - I had split it into separate patches as it was
in different files - giving them the same name of course was a bit
brain-dead.
You should have mentioned the modified files in the subject. But IMHO it
would be better to have just one patch.
please do give it one more look - if the above argument is invalid
I apologize for the noise.
It's me who should apologize. :-<
thx!
hofrat
WBR, Sergei
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