FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-25 02:48:21 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge git://git.kvack.org/~bcrl/aio-fixes

Browse Source 
Pull aio bugfixes from Ben LaHaise:
 "Two small fixes"

* git://git.kvack.org/~bcrl/aio-fixes:
  aio: block exit_aio() until all context requests are completed
  aio: add missing smp_rmb() in read_events_ring
This commit is contained in:
Linus Torvalds 2014-09-04 16:08:55 -07:00
commit b7fece1be8
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/aio.c
View File

@ -793,6 +793,8 @@ void exit_aio(struct mm_struct *mm)
for (i = 0; i < table->nr; ++i) {
struct kioctx *ctx = table->table[i];
struct completion requests_done =
COMPLETION_INITIALIZER_ONSTACK(requests_done);
if (!ctx)
continue;
@ -804,7 +806,10 @@ void exit_aio(struct mm_struct *mm)
* that it needs to unmap the area, just set it to 0.
*/
ctx->mmap_size = 0;
kill_ioctx(mm, ctx, NULL);
kill_ioctx(mm, ctx, &requests_done);
/* Wait until all IO for the context are done. */
wait_for_completion(&requests_done);
}
RCU_INIT_POINTER(mm->ioctx_table, NULL);
@ -1111,6 +1116,12 @@ static long aio_read_events_ring(struct kioctx *ctx,
tail = ring->tail;
kunmap_atomic(ring);
/*
* Ensure that once we've read the current tail pointer, that
* we also see the events that were stored up to the tail.
*/
smp_rmb();
pr_debug("h%u t%u m%u\n", head, tail, ctx->nr_events);
if (head == tail)