linux-kernel - [PATCH v2 0/2] Hi655x: mfd/pmic: regulator: Correct dependencies

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Message-Id: <20170403052843.12711-1-lintonrjeremy@gmail.com>
Date:   Mon,  3 Apr 2017 00:28:41 -0500
From:   Jeremy Linton <lintonrjeremy@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     broonie@...nel.org, lgirdwood@...il.com, puck.chen@...ilicon.com,
        lee.jones@...aro.org, Jeremy Linton <lintonrjeremy@...il.com>
Subject: [PATCH v2 0/2] Hi655x: mfd/pmic: regulator: Correct dependencies

In an environment where the hi655x pmic is being built as a 
standalone module, it fails to automatically load resulting
in boot failures, machine hangs, etc. First we correct this
by setting an appropriate module dependency. Then we bump the
module use count on the mfd/pmic driver so that it cannot be
unloaded when in use. This avoids an unload warning and
crashes like:

 Unable to handle kernel paging request at virtual address ffff800078fc5c78
 pgd = ffff00000a150000
 *pgd=000000007ffc0003, *pud=000000007ffc0003, *pmd=00e8000060000711
 Internal error: Oops: 8600000e [#1] SMP
 ...
 [<ffff800078fc5c78>] 0xffff800078fc5c78
 [<ffff0000086248f8>] regulator_set_voltage_sel_regmap+0x50/0x98
 [<ffff00000861e830>] _regulator_do_set_voltage+0x4c8/0x7c0
 [<ffff000008620804>] regulator_set_voltage_unlocked+0xc4/0x258
 [<ffff0000086209d4>] regulator_set_voltage+0x3c/0x70
 [<ffff000000af1b30>] mmc_regulator_set_ocr+0x48/0x100 [mmc_core]
 [<ffff000000c93da8>] dw_mci_set_ios+0x1e8/0x280 [dw_mmc]
 [<ffff000000af483c>] mmc_set_initial_state+0x84/0xf8 [mmc_core]
 [<ffff000000af490c>] mmc_power_up.part.13+0x5c/0x1f8 [mmc_core]
 [<ffff000000af5c20>] mmc_rescan+0x270/0x3b0 [mmc_core]
 [<ffff0000080f3a14>] process_one_work+0x264/0x7c0
 [<ffff0000080f3fc4>] worker_thread+0x54/0x430
 [<ffff0000080fc5dc>] kthread+0x104/0x130
 [<ffff000008083380>] ret_from_fork+0x10/0x50

V1->V2:
  Change from a module post call to a module_device_table.

Jeremy Linton (2):
  regulator: hi655x: Describe consumed platform device
  regulator: hi655x: Bump parent pmic module use count

 drivers/regulator/hi655x-regulator.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

-- 
2.10.2