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SubjectRe: [GIT] Networking
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On 18-1-2016 12:30, Marc Zyngier wrote:
> Hi Kalle,
>
> On 16/01/16 11:57, Kalle Valo wrote:
>> Marc Zyngier <marc.zyngier@arm.com> writes:
>>
>>> David, Hante,
>>>
>>> On 13/01/16 02:51, David Miller wrote:
>>>
>>> [...]
>>>
>>>> Hante Meuleman (33):
>>> [...]
>>>> brcmfmac: Move all module parameters to one place
>>
>> As a reminder to myself this is the commit id:
>>
>> 7d34b0560567 brcmfmac: Move all module parameters to one place
>>
>>> This particular patch breaks one of my boxes in a spectacular way:
>>>
>>> [ 3.602155] Unable to handle kernel paging request at virtual address 000027e4
>>> [ 3.602160] pgd = c0003000
>>> [ 3.602169] [000027e4] *pgd=80000040004003, *pmd=00000000
>>> [ 3.602181] Internal error: Oops: 206 [#1] PREEMPT SMP ARM
>>
>> [...]
>>
>>> This is caused by this hunk:
>>>
>>> @@ -890,7 +887,8 @@ static void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
>>> if (!sdiodev->sg_support)
>>> return;
>>>
>>> - nents = max_t(uint, BRCMF_DEFAULT_RXGLOM_SIZE, brcmf_sdiod_txglomsz);
>>> + nents = max_t(uint, BRCMF_DEFAULT_RXGLOM_SIZE,
>>> + sdiodev->bus_if->drvr->settings->sdiod_txglomsz);
>>> nents += (nents >> 4) + 1;
>>>
>>> WARN_ON(nents > sdiodev->max_segment_count);
>>>
>>> were drvr->settings is NULL (as the settings allocation seems to be done
>>> much later). The fix is not completely obvious to me (probably requires
>>> pushing the call to brcmf_mp_device_attach() down into the various bus
>>> specific functions). An alternative would be to restore the txglomsz
>>> parameter as it was before and not rely on settings being allocated.
>>
>> Should we revert the patch or can you Hante fix this? The revert doesn't
>> seem to be trivial so I would appreciate if someone could send a patch.
>
> I've worked out a partial revert (see below) that allows my system to
> boot, but I'd rather see a proper fix from the maintainer of this code.

Hi Marc,

Thanks for the patch, but Hante has created a different patch basically
deferring the allocation of the sgtable. Feel free to give it a spin on
your box and share the results. I am looking for a arm64 platform to add
to my test machines so if you can recommend one (with PCIe).

Regards,
Arend

From f7d015866f24cfad5af0c35b1ab60c567835c5e8 Mon Sep 17 00:00:00 2001
From: Hante Meuleman <meuleman@broadcom.com>
Date: Mon, 18 Jan 2016 15:19:45 +0100
Subject: [PATCH] brcmfmac: fix sdio sg table alloc crash

With the patch to move all module paramaters to one place a bug was
introduced causing a null pointer exception. This patch fixes the
bug by initializing the sg table till after the settings have been
initialized.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
---
.../wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 40
++++++++--------------
.../wireless/broadcom/brcm80211/brcmfmac/sdio.c | 5 +++
.../wireless/broadcom/brcm80211/brcmfmac/sdio.h | 1 +
3 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
index 5363739..b98db8a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -879,11 +879,24 @@ int brcmf_sdiod_abort(struct brcmf_sdio_dev
*sdiodev, uint fn)
return 0;
}

-static void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
+void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
{
+ struct sdio_func *func;
+ struct mmc_host *host;
+ uint max_blocks;
uint nents;
int err;

+ func = sdiodev->func[2];
+ host = func->card->host;
+ sdiodev->sg_support = host->max_segs > 1;
+ max_blocks = min_t(uint, host->max_blk_count, 511u);
+ sdiodev->max_request_size = min_t(uint, host->max_req_size,
+ max_blocks * func->cur_blksize);
+ sdiodev->max_segment_count = min_t(uint, host->max_segs,
+ SG_MAX_SINGLE_ALLOC);
+ sdiodev->max_segment_size = host->max_seg_size;
+
if (!sdiodev->sg_support)
return;

@@ -1021,9 +1034,6 @@ static void brcmf_sdiod_host_fixup(struct mmc_host
*host)

static int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)
{
- struct sdio_func *func;
- struct mmc_host *host;
- uint max_blocks;
int ret = 0;

sdiodev->num_funcs = 2;
@@ -1054,26 +1064,6 @@ static int brcmf_sdiod_probe(struct
brcmf_sdio_dev *sdiodev)
goto out;
}

- /*
- * determine host related variables after brcmf_sdiod_probe()
- * as func->cur_blksize is properly set and F2 init has been
- * completed successfully.
- */
- func = sdiodev->func[2];
- host = func->card->host;
- sdiodev->sg_support = host->max_segs > 1;
- max_blocks = min_t(uint, host->max_blk_count, 511u);
- sdiodev->max_request_size = min_t(uint, host->max_req_size,
- max_blocks * func->cur_blksize);
- sdiodev->max_segment_count = min_t(uint, host->max_segs,
- SG_MAX_SINGLE_ALLOC);
- sdiodev->max_segment_size = host->max_seg_size;
-
- /* allocate scatter-gather table. sg support
- * will be disabled upon allocation failure.
- */
- brcmf_sdiod_sgtable_alloc(sdiodev);
-
ret = brcmf_sdiod_freezer_attach(sdiodev);
if (ret)
goto out;
@@ -1084,7 +1074,7 @@ static int brcmf_sdiod_probe(struct brcmf_sdio_dev
*sdiodev)
ret = -ENODEV;
goto out;
}
- brcmf_sdiod_host_fixup(host);
+ brcmf_sdiod_host_fixup(sdiodev->func[2]->card->host);
out:
if (ret)
brcmf_sdiod_remove(sdiodev);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index dd66143..a14d9d9d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -4114,6 +4114,11 @@ 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);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
index 5ec7a6d..23f2231 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
@@ -342,6 +342,7 @@ int brcmf_sdiod_ramrw(struct brcmf_sdio_dev
*sdiodev, bool write, u32 address,

/* Issue an abort to the specified function */
int brcmf_sdiod_abort(struct brcmf_sdio_dev *sdiodev, uint fn);
+void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev);
void brcmf_sdiod_change_state(struct brcmf_sdio_dev *sdiodev,
enum brcmf_sdiod_state state);
#ifdef CONFIG_PM_SLEEP
--
1.9.1
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