diff options
author | Roger Quadros <rogerq@ti.com> | 2016-05-09 11:28:37 +0300 |
---|---|---|
committer | Lee Jones <lee.jones@linaro.org> | 2016-05-09 15:41:48 +0100 |
commit | b49b927f16acee626c56a1af4ab4cb062f75b5df (patch) | |
tree | 3629f069365e447c3a3edd7024447ae52aa8c146 /drivers/mfd | |
parent | 409b6246cd1c564ea377d5cbe8c6fd184e96119e (diff) | |
download | linux-b49b927f16acee626c56a1af4ab4cb062f75b5df.tar.gz linux-b49b927f16acee626c56a1af4ab4cb062f75b5df.tar.xz |
mfd: omap-usb-tll: Fix scheduling while atomic BUG
We shouldn't be calling clk_prepare_enable()/clk_prepare_disable()
in an atomic context.
Fixes the following issue:
[ 5.830970] ehci-omap: OMAP-EHCI Host Controller driver
[ 5.830974] driver_register 'ehci-omap'
[ 5.895849] driver_register 'wl1271_sdio'
[ 5.896870] BUG: scheduling while atomic: udevd/994/0x00000002
[ 5.896876] 4 locks held by udevd/994:
[ 5.896904] #0: (&dev->mutex){......}, at: [<c049597c>] __driver_attach+0x60/0xac
[ 5.896923] #1: (&dev->mutex){......}, at: [<c049598c>] __driver_attach+0x70/0xac
[ 5.896946] #2: (tll_lock){+.+...}, at: [<c04c2630>] omap_tll_enable+0x2c/0xd0
[ 5.896966] #3: (prepare_lock){+.+...}, at: [<c05ce9c8>] clk_prepare_lock+0x48/0xe0
[ 5.897042] Modules linked in: wlcore_sdio(+) ehci_omap(+) dwc3_omap snd_soc_ts3a225e leds_is31fl319x bq27xxx_battery_i2c tsc2007 bq27xxx_battery bq2429x_charger ina2xx tca8418_keypad as5013 leds_tca6507 twl6040_vibra gpio_twl6040 bmp085_i2c(+) palmas_gpadc usb3503 palmas_pwrbutton bmg160_i2c(+) bmp085 bma150(+) bmg160_core bmp280 input_polldev snd_soc_omap_mcbsp snd_soc_omap_mcpdm snd_soc_omap snd_pcm_dmaengine
[ 5.897048] Preemption disabled at:[< (null)>] (null)
[ 5.897051]
[ 5.897059] CPU: 0 PID: 994 Comm: udevd Not tainted 4.6.0-rc5-letux+ #233
[ 5.897062] Hardware name: Generic OMAP5 (Flattened Device Tree)
[ 5.897076] [<c010e714>] (unwind_backtrace) from [<c010af34>] (show_stack+0x10/0x14)
[ 5.897087] [<c010af34>] (show_stack) from [<c040aa7c>] (dump_stack+0x88/0xc0)
[ 5.897099] [<c040aa7c>] (dump_stack) from [<c020c558>] (__schedule_bug+0xac/0xd0)
[ 5.897111] [<c020c558>] (__schedule_bug) from [<c06f3d44>] (__schedule+0x88/0x7e4)
[ 5.897120] [<c06f3d44>] (__schedule) from [<c06f46d8>] (schedule+0x9c/0xc0)
[ 5.897129] [<c06f46d8>] (schedule) from [<c06f4904>] (schedule_preempt_disabled+0x14/0x20)
[ 5.897140] [<c06f4904>] (schedule_preempt_disabled) from [<c06f64e4>] (mutex_lock_nested+0x258/0x43c)
[ 5.897150] [<c06f64e4>] (mutex_lock_nested) from [<c05ce9c8>] (clk_prepare_lock+0x48/0xe0)
[ 5.897160] [<c05ce9c8>] (clk_prepare_lock) from [<c05d0e7c>] (clk_prepare+0x10/0x28)
[ 5.897169] [<c05d0e7c>] (clk_prepare) from [<c04c2668>] (omap_tll_enable+0x64/0xd0)
[ 5.897180] [<c04c2668>] (omap_tll_enable) from [<c04c1728>] (usbhs_runtime_resume+0x18/0x17c)
[ 5.897192] [<c04c1728>] (usbhs_runtime_resume) from [<c049d404>] (pm_generic_runtime_resume+0x2c/0x40)
[ 5.897202] [<c049d404>] (pm_generic_runtime_resume) from [<c049f180>] (__rpm_callback+0x38/0x68)
[ 5.897210] [<c049f180>] (__rpm_callback) from [<c049f220>] (rpm_callback+0x70/0x88)
[ 5.897218] [<c049f220>] (rpm_callback) from [<c04a0a00>] (rpm_resume+0x4ec/0x7ec)
[ 5.897227] [<c04a0a00>] (rpm_resume) from [<c04a0f48>] (__pm_runtime_resume+0x4c/0x64)
[ 5.897236] [<c04a0f48>] (__pm_runtime_resume) from [<c04958dc>] (driver_probe_device+0x30/0x70)
[ 5.897246] [<c04958dc>] (driver_probe_device) from [<c04959a4>] (__driver_attach+0x88/0xac)
[ 5.897256] [<c04959a4>] (__driver_attach) from [<c04940f8>] (bus_for_each_dev+0x50/0x84)
[ 5.897267] [<c04940f8>] (bus_for_each_dev) from [<c0494e40>] (bus_add_driver+0xcc/0x1e4)
[ 5.897276] [<c0494e40>] (bus_add_driver) from [<c0496914>] (driver_register+0xac/0xf4)
[ 5.897286] [<c0496914>] (driver_register) from [<c01018e0>] (do_one_initcall+0x100/0x1b8)
[ 5.897296] [<c01018e0>] (do_one_initcall) from [<c01c7a54>] (do_init_module+0x58/0x1c0)
[ 5.897304] [<c01c7a54>] (do_init_module) from [<c01c8a3c>] (SyS_finit_module+0x88/0x90)
[ 5.897313] [<c01c8a3c>] (SyS_finit_module) from [<c0107120>] (ret_fast_syscall+0x0/0x1c)
[ 5.912697] ------------[ cut here ]------------
[ 5.912711] WARNING: CPU: 0 PID: 994 at kernel/sched/core.c:2996 _raw_spin_unlock+0x28/0x58
[ 5.912717] DEBUG_LOCKS_WARN_ON(val > preempt_count())
Cc: <stable@vger.kernel.org>
Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Tested-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r-- | drivers/mfd/omap-usb-tll.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index b7b3e8ee64f2..c30290f33430 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -269,6 +269,8 @@ static int usbtll_omap_probe(struct platform_device *pdev) if (IS_ERR(tll->ch_clk[i])) dev_dbg(dev, "can't get clock : %s\n", clkname); + else + clk_prepare(tll->ch_clk[i]); } pm_runtime_put_sync(dev); @@ -301,9 +303,12 @@ static int usbtll_omap_remove(struct platform_device *pdev) tll_dev = NULL; spin_unlock(&tll_lock); - for (i = 0; i < tll->nch; i++) - if (!IS_ERR(tll->ch_clk[i])) + for (i = 0; i < tll->nch; i++) { + if (!IS_ERR(tll->ch_clk[i])) { + clk_unprepare(tll->ch_clk[i]); clk_put(tll->ch_clk[i]); + } + } pm_runtime_disable(&pdev->dev); return 0; @@ -420,7 +425,7 @@ int omap_tll_enable(struct usbhs_omap_platform_data *pdata) if (IS_ERR(tll->ch_clk[i])) continue; - r = clk_prepare_enable(tll->ch_clk[i]); + r = clk_enable(tll->ch_clk[i]); if (r) { dev_err(tll_dev, "Error enabling ch %d clock: %d\n", i, r); @@ -448,7 +453,7 @@ int omap_tll_disable(struct usbhs_omap_platform_data *pdata) for (i = 0; i < tll->nch; i++) { if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { if (!IS_ERR(tll->ch_clk[i])) - clk_disable_unprepare(tll->ch_clk[i]); + clk_disable(tll->ch_clk[i]); } } |