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| author | Guenter Roeck <linux@roeck-us.net> | 2019-12-25 08:34:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-23 08:19:38 +0100 |
| commit | 92e9a8037961714191f8476f7938c6685a7c178c (patch) | |
| tree | 8d44c1edccc6190ecff6445241c9b560ef671fb5 | |
| parent | 1a087b517c3acb8330d5f9da5ab59ee080492aeb (diff) | |
| download | linux-stable-92e9a8037961714191f8476f7938c6685a7c178c.tar.gz linux-stable-92e9a8037961714191f8476f7938c6685a7c178c.tar.bz2 linux-stable-92e9a8037961714191f8476f7938c6685a7c178c.zip | |
clk: Don't try to enable critical clocks if prepare failed
commit 12ead77432f2ce32dea797742316d15c5800cb32 upstream.
The following traceback is seen if a critical clock fails to prepare.
bcm2835-clk 3f101000.cprman: plld: couldn't lock PLL
------------[ cut here ]------------
Enabling unprepared plld_per
WARNING: CPU: 1 PID: 1 at drivers/clk/clk.c:1014 clk_core_enable+0xcc/0x2c0
...
Call trace:
clk_core_enable+0xcc/0x2c0
__clk_register+0x5c4/0x788
devm_clk_hw_register+0x4c/0xb0
bcm2835_register_pll_divider+0xc0/0x150
bcm2835_clk_probe+0x134/0x1e8
platform_drv_probe+0x50/0xa0
really_probe+0xd4/0x308
driver_probe_device+0x54/0xe8
device_driver_attach+0x6c/0x78
__driver_attach+0x54/0xd8
...
Check return values from clk_core_prepare() and clk_core_enable() and
bail out if any of those functions returns an error.
Cc: Jerome Brunet <jbrunet@baylibre.com>
Fixes: 99652a469df1 ("clk: migrate the count of orphaned clocks at init")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lkml.kernel.org/r/20191225163429.29694-1-linux@roeck-us.net
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/clk/clk.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index c745dad7f85e..af4f2ffc4fc5 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2448,11 +2448,17 @@ static int __clk_core_init(struct clk_core *core) if (core->flags & CLK_IS_CRITICAL) { unsigned long flags; - clk_core_prepare(core); + ret = clk_core_prepare(core); + if (ret) + goto out; flags = clk_enable_lock(); - clk_core_enable(core); + ret = clk_core_enable(core); clk_enable_unlock(flags); + if (ret) { + clk_core_unprepare(core); + goto out; + } } /* |