io_uring: fix imbalanced sqo_mm accounting

We do the initial accounting of locked_vm and pinned_vm before we have
setup ctx->sqo_mm, which means we can end up having not accounted the
memory at setup time, but still decrement it when we exit. This causes
an imbalance in the accounting.

Setup ctx->sqo_mm earlier in io_uring_create(), before we do the first
accounting of mm->{locked,pinned}_vm. This also unifies the state
grabbing for the ctx, and eliminates a failure case in
io_sq_offload_start().

Fixes: f74441e6311a ("io_uring: account locked memory before potential error case")
Reported-by: Robert M. Muncrief <[email protected]>
Reported-by: Niklas Schnelle <[email protected]>
Tested-by: Niklas Schnelle <[email protected]>
Tested-by: Robert M. Muncrief <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

0 files changed, 0 insertions, 0 deletions