On Thu, 2 May 2019 at 21:07, Raul E Rangel <rrangel@xxxxxxxxxxxx> wrote: > > The tag set is allocated in mmc_init_queue but never freed. This results > in a memory leak. This change makes sure we free the tag set when the > queue is also freed. > > Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx> Applied for fixes (it may not make it for v5.1 unless there is a rc8), thanks! I also dropped the white space fixup, for the reasons explained by Adrian. Kind regards Uffe > --- > I found this using kmemleak and plugging and unplugging an SD card in a > few times. > > Here is an example of the output of kmemleak: > unreferenced object 0xffff888125be4ce8 (size 8): > comm "kworker/1:0", pid 17, jiffies 4294901575 (age 204.773s) > hex dump (first 8 bytes): > 00 00 00 00 00 00 00 00 ........ > backtrace: > [<0000000061cb8887>] blk_mq_alloc_tag_set+0xe9/0x234 > [<00000000cf532a0f>] mmc_init_queue+0xa9/0x2f0 > [<000000001e085171>] mmc_blk_alloc_req+0x125/0x2f9 > [<00000000eae1bd01>] mmc_blk_probe+0x1e2/0x6c1 > [<00000000a0b4a87d>] really_probe+0x1bd/0x3b0 > [<00000000e58f3eb9>] driver_probe_device+0xe1/0x115 > [<00000000358f3b3c>] bus_for_each_drv+0x89/0xac > [<00000000ef52ccbe>] __device_attach+0xb0/0x14a > [<00000000c9daafa7>] bus_probe_device+0x33/0x9f > [<0000000008ac5779>] device_add+0x34b/0x5e2 > [<00000000b42623cc>] mmc_add_card+0x1f5/0x20d > [<00000000f114ebc3>] mmc_attach_sd+0xc5/0x14b > [<000000006e915e0d>] mmc_rescan+0x261/0x2b6 > [<00000000e5b49c26>] process_one_work+0x1d3/0x31f > [<0000000068c8cd3c>] worker_thread+0x1cd/0x2bf > [<00000000326e2e22>] kthread+0x14f/0x157 > > Once I applied this patch the leak went away. > > p.s., I included a small white space fix. Hope that's ok. > > drivers/mmc/core/queue.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c > index 7c364a9c4eeb..176a08748cf1 100644 > --- a/drivers/mmc/core/queue.c > +++ b/drivers/mmc/core/queue.c > @@ -402,7 +402,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card) > > mq->card = card; > mq->use_cqe = host->cqe_enabled; > - > + > spin_lock_init(&mq->lock); > > memset(&mq->tag_set, 0, sizeof(mq->tag_set)); > @@ -472,6 +472,7 @@ void mmc_cleanup_queue(struct mmc_queue *mq) > blk_mq_unquiesce_queue(q); > > blk_cleanup_queue(q); > + blk_mq_free_tag_set(&mq->tag_set); > > /* > * A request can be completed before the next request, potentially > -- > 2.21.0.593.g511ec345e18-goog >
