On 22-07-17 15:18, Stefan Wahren wrote:
> Hi,
>
> with enabled memleak detector on 4.13-rc1 (Raspberry Pi Zero W) i get the
> following:
>
> root@raspberrypi:/sys/kernel/debug# cat kmemleak
> unreferenced object 0xd824e400 (size 1024):
> comm "kworker/0:0", pid 3, jiffies 4294939822 (age 873.420s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<c07f741c>] kmemleak_alloc+0x60/0xc8
> [<c024cb44>] __kmalloc+0x184/0x2f4
> [<c03dc1c8>] sg_kmalloc+0x48/0x4c
> [<c03dc0dc>] __sg_alloc_table+0x78/0x11c
> [<c03dc5d0>] sg_alloc_table+0x2c/0x5c
> [<bf07d7e8>] brcmf_sdiod_sgtable_alloc+0xc0/0x110 [brcmfmac]
> [<bf07b814>] brcmf_sdio_probe+0x24c/0x970 [brcmfmac]
> [<bf07c6fc>] brcmf_ops_sdio_probe+0x17c/0x244 [brcmfmac]
> [<c057d5b4>] sdio_bus_probe+0xb4/0x124
> [<c04add08>] driver_probe_device+0x1d8/0x438
> [<c04ae00c>] __driver_attach+0xa4/0x108
> [<c04abe20>] bus_for_each_dev+0x84/0x98
> [<c04ad644>] driver_attach+0x28/0x30
> [<c04ad084>] bus_add_driver+0xe4/0x24c
> [<c04ae834>] driver_register+0xac/0xf0
> [<c057d7dc>] sdio_register_driver+0x2c/0x34
Hi Stefan,
Thanks for the report. Checking elixir it shows two call sites to
brcmf_sdiod_sgtable_alloc() [1]. This is rather unexpected. We did move
the call so this might be a merge issue.
4d7928959 sdio.c (Hante Meuleman 2016-02-17 11:27:07 +0100:
3867) brcmf_sdiod_sgtable_alloc(sdiodev);
e0045bf80 sdio.c (Hante Meuleman 2016-01-19 12:39:24 +0100:
4180) brcmf_sdiod_sgtable_alloc(bus->sdiodev);
The most recent change is:
commit 4d7928959832 ("brcmfmac: switch to new platform data") found in
patchwork [2], which shows the added call, but no removal so the merge
issue is probably internal with us (me :-( ).
Again thanks for the report. Below change should fix the issue.
Regards,
Arend
[1]
http://elixir.free-electrons.com/linux/latest/ident/brcmf_sdiod_sgtable_alloc
[2] https://patchwork.kernel.org/patch/8336231/
---
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index fbcbb43..ed2c693 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -4174,11 +4174,6 @@ struct brcmf_sdio *brcmf_sdio_probe(struct
brcmf_sdio_dev *sdiodev)
goto fail;
}
- /* allocate scatter-gather table. sg support
- * will be disabled upon allocation failure.
- */
- brcmf_sdiod_sgtable_alloc(bus->sdiodev);
-
/* Query the F2 block size, set roundup accordingly */
bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
bus->roundup = min(max_roundup, bus->blocksize);
