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From: Bruno Thomsen <bruno.thomsen@gmail.com>
To: Sascha Hauer <s.hauer@pengutronix.de>,
	dmaengine@vger.kernel.org, linux-mtd@lists.infradead.org
Cc: vkoul@kernel.org, miquel.raynal@bootlin.com, bth@kamstrup.com,
	NXP Linux Team <linux-imx@nxp.com>
Subject: Regression: dmaengine: imx28 with emmc
Date: Tue, 8 Oct 2019 10:03:16 +0200	[thread overview]
Message-ID: <CAH+2xPB7rbeJnOPU10Ss9BhV_2DJV-ToQ3XNOy97+vrGx+ubcg@mail.gmail.com> (raw)

Hi

I am getting a kernel oops[1] during boot on imx28 with emmc flash right
around rootfs mounting. Using git bisect I found the cause to be the
following commit.

Regression: ceeeb99cd821 ("dmaengine: mxs: rename custom flag")

Reverting the 2 changes in drivers/dma/mxs-dma.c fixes the oops,
but I am not sure that is the right solution as I don't have the full
mxs-dma + mtd/mmc overview.

I did see that the patch isn't a simple rename but also a bit define
change.
From: DMA_CTRL_ACK = (1 << 1) = BIT(1)
To: MXS_DMA_CTRL_WAIT4END = BIT(31)

Bruno

[1] One of the kernel oops during git bisect (dirty part is just a dts).

[    2.326402] 8<--- cut here ---
[    2.329575] Unable to handle kernel NULL pointer dereference at
virtual address 00000252
[    2.337988] pgd = (ptrval)
[    2.340793] [00000252] *pgd=00000000
[    2.344483] Internal error: Oops: 5 [#1] ARM
[    2.348790] Modules linked in:
[    2.351904] CPU: 0 PID: 21 Comm: kworker/0:1 Not tainted
5.2.0-10687-g5fe7b600a116-dirty #6
[    2.360283] Hardware name: Freescale MXS (Device Tree)
[    2.365480] Workqueue: events_freezable mmc_rescan
[    2.370324] PC is at mmc_wait_for_cmd+0x30/0xa4
[    2.374893] LR is at mmc_wait_for_cmd+0x30/0xa4
[    2.379453] pc : [<c0389608>]    lr : [<c0389608>]    psr: 40000013
[    2.385748] sp : cf5d9d20  ip : cf5d9d9c  fp : cf73ca64
[    2.391000] r10: 00000001  r9 : cf68f2b0  r8 : 00200000
[    2.396254] r7 : 00000000  r6 : ffffff92  r5 : c0701068  r4 : cf5d9db8
[    2.402810] r3 : 00000000  r2 : fffffffc  r1 : 00000000  r0 : cf5d9d20
[    2.409368] Flags: nZcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[    2.416537] Control: 0005317f  Table: 40004000  DAC: 00000053
[    2.422315] Process kworker/0:1 (pid: 21, stack limit = 0x(ptrval))
[    2.428611] Stack: (0xcf5d9d20 to 0xcf5da000)
[    2.433016] 9d20: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.441237] 9d40: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.449460] 9d60: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.457680] 9d80: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 3a80845c
[    2.465903] 9da0: 0000000a c0701068 ffffff92 00200000 0000000a
c0392b0c 00000008 000001aa
[    2.474125] 9dc0: 00000000 00000000 00000000 00000000 000002f5
00000000 00000000 00000000
[    2.482347] 9de0: 00000000 00000000 00000000 3a80845c ffffff92
00200000 00000000 c0391a28
[    2.490569] 9e00: 00000000 cf68f000 cf73c800 cf73ca64 00200000
00200000 0000000a 00000000
[    2.498795] 9e20: c0701068 c03937b0 cf5d9e3c 3a80845c cf5d9e54
c030466c c0634ef0 c06484f0
[    2.507021] 9e40: cf4f4680 cf5d9e54 c0701068 c03048c0 ffffff92
ffffff3f cf5d9e50 3a80845c
[    2.515244] 9e60: c0760fc0 cf68f338 00000001 cf68f000 cf68f000
c0760fc0 c0525400 c0701068
[    2.523466] 9e80: 00000000 c0394460 00000008 000001aa ffffff3f
00000000 00000000 00000000
[    2.531689] 9ea0: ffffff3f 3a80845c 00000000 cf68f338 00000001
cf68f000 ffffff92 c0760fc0
[    2.539915] 9ec0: c0525400 c0525410 c0760fb0 c038b47c 00000000
c0708ca4 cf68f338 cf68f338
[    2.548139] 9ee0: cf5aa540 c0708ca4 cfde0600 cf5d9f1c c075a9f9
c075b414 c0701068 c0035298
[    2.556363] 9f00: 00000001 00000000 c0035200 c04eb0c8 00000000
00000000 c00356e8 c0dceb08
[    2.564588] 9f20: c0bbe570 00000000 c06467a0 3a80845c c0708ca4
cf5aa540 c0708ca4 cf5aa554
[    2.572811] 9f40: c0708cd8 ffffe000 c070ff60 00000008 c0708ca4
c0035644 60000053 cf5cb244
[    2.581035] 9f60: ffffe000 cf5b7280 cf5a3fc0 00000000 cf5d8000
cf5aa540 c0035618 cf49be90
[    2.589260] 9f80: cf5b72b8 c003aae8 20000053 cf5a3fc0 c003a9c8
00000000 00000000 00000000
[    2.597483] 9fa0: 00000000 00000000 00000000 c00090b0 00000000
00000000 00000000 00000000
[    2.605703] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.613924] 9fe0: 00000000 00000000 00000000 00000000 00000013
00000000 00000000 00000000
[    2.622176] [<c0389608>] (mmc_wait_for_cmd) from [<c0392b0c>]
(mmc_send_if_cond+0x64/0xb0)
[    2.630507] [<c0392b0c>] (mmc_send_if_cond) from [<c0391a28>]
(mmc_sd_get_cid+0x40/0x164)
[    2.638750] [<c0391a28>] (mmc_sd_get_cid) from [<c03937b0>]
(mmc_sdio_init_card+0x28c/0xcb0)
[    2.647249] [<c03937b0>] (mmc_sdio_init_card) from [<c0394460>]
(mmc_attach_sdio+0x90/0x350)
[    2.655744] [<c0394460>] (mmc_attach_sdio) from [<c038b47c>]
(mmc_rescan+0x370/0x448)
[    2.663646] [<c038b47c>] (mmc_rescan) from [<c0035298>]
(process_one_work+0x220/0x5a0)
[    2.671629] [<c0035298>] (process_one_work) from [<c0035644>]
(worker_thread+0x2c/0x50c)
[    2.679783] [<c0035644>] (worker_thread) from [<c003aae8>]
(kthread+0x120/0x134)
[    2.687232] [<c003aae8>] (kthread) from [<c00090b0>]
(ret_from_fork+0x14/0x24)
[    2.694488] Exception stack(0xcf5d9fb0 to 0xcf5d9ff8)
[    2.699581] 9fa0:                                     00000000
00000000 00000000 00000000
[    2.707803] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.716018] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    2.722683] Code: e3a0207c e3a01000 e58d307c eb050cad (e5d632c0)
[    2.729008] ---[ end trace bc2ac96ca83a59e7 ]---

             reply	other threads:[~2019-10-08  8:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-08  8:03 Bruno Thomsen [this message]
2019-10-14 14:13 ` Regression: dmaengine: imx28 with emmc Sascha Hauer
2019-10-17 11:30   ` Bruno Thomsen
2019-10-17 12:41   ` Fabio Estevam
2019-10-17 12:59   ` Vinod Koul
2019-10-18  9:50   ` Sascha Hauer

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