On pią, 2015-01-16 at 15:30 +0100, Paul Osmialowski wrote: > This change addresses following problem: > > [ 2.560726] ------------[ cut here ]------------ > [ 2.565341] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2744 lockdep_trace_alloc+0xec/0x118() > [ 2.574439] DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)) > [ 2.579821] Modules linked in: > [ 2.583038] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.18.0-next-20141216-00002-g4ff197fc1902-dirty #1318 > [ 2.593796] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > [ 2.599892] [<c0014c44>] (unwind_backtrace) from [<c0011bbc>] (show_stack+0x10/0x14) > [ 2.607612] [<c0011bbc>] (show_stack) from [<c04953b8>] (dump_stack+0x70/0xbc) > [ 2.614822] [<c04953b8>] (dump_stack) from [<c0023444>] (warn_slowpath_common+0x74/0xb0) > [ 2.622885] [<c0023444>] (warn_slowpath_common) from [<c0023514>] (warn_slowpath_fmt+0x30/0x40) > [ 2.631569] [<c0023514>] (warn_slowpath_fmt) from [<c0063644>] (lockdep_trace_alloc+0xec/0x118) > [ 2.640246] [<c0063644>] (lockdep_trace_alloc) from [<c00df52c>] (__kmalloc+0x3c/0x1cc) > [ 2.648240] [<c00df52c>] (__kmalloc) from [<c0394970>] (clk_fetch_parent_index+0xb8/0xd4) > [ 2.656390] [<c0394970>] (clk_fetch_parent_index) from [<c0394a6c>] (clk_calc_new_rates+0xe0/0x1fc) > [ 2.665415] [<c0394a6c>] (clk_calc_new_rates) from [<c0394b40>] (clk_calc_new_rates+0x1b4/0x1fc) > [ 2.674181] [<c0394b40>] (clk_calc_new_rates) from [<c0395408>] (clk_set_rate+0x50/0xc8) > [ 2.682265] [<c0395408>] (clk_set_rate) from [<c0377708>] (sdhci_cmu_set_clock+0x68/0x16c) > [ 2.690503] [<c0377708>] (sdhci_cmu_set_clock) from [<c03735cc>] (sdhci_do_set_ios+0xf0/0x64c) > [ 2.699095] [<c03735cc>] (sdhci_do_set_ios) from [<c0373b48>] (sdhci_set_ios+0x20/0x2c) > [ 2.707080] [<c0373b48>] (sdhci_set_ios) from [<c035ddf0>] (mmc_power_up+0x118/0x1fc) > [ 2.714889] [<c035ddf0>] (mmc_power_up) from [<c035ecd0>] (mmc_start_host+0x44/0x6c) > [ 2.722615] [<c035ecd0>] (mmc_start_host) from [<c035fd60>] (mmc_add_host+0x58/0x7c) > [ 2.730341] [<c035fd60>] (mmc_add_host) from [<c037454c>] (sdhci_add_host+0x968/0xd94) > [ 2.738240] [<c037454c>] (sdhci_add_host) from [<c0377b60>] (sdhci_s3c_probe+0x354/0x52c) > [ 2.746406] [<c0377b60>] (sdhci_s3c_probe) from [<c0283b58>] (platform_drv_probe+0x48/0xa4) > [ 2.754733] [<c0283b58>] (platform_drv_probe) from [<c02824e8>] (driver_probe_device+0x13c/0x37c) > [ 2.763585] [<c02824e8>] (driver_probe_device) from [<c02827bc>] (__driver_attach+0x94/0x98) > [ 2.772003] [<c02827bc>] (__driver_attach) from [<c0280a60>] (bus_for_each_dev+0x54/0x88) > [ 2.780163] [<c0280a60>] (bus_for_each_dev) from [<c0281b48>] (bus_add_driver+0xe4/0x200) > [ 2.788322] [<c0281b48>] (bus_add_driver) from [<c0282dfc>] (driver_register+0x78/0xf4) > [ 2.796308] [<c0282dfc>] (driver_register) from [<c00089b0>] (do_one_initcall+0xac/0x1f0) > [ 2.804473] [<c00089b0>] (do_one_initcall) from [<c0673d94>] (kernel_init_freeable+0x10c/0x1d8) > [ 2.813153] [<c0673d94>] (kernel_init_freeable) from [<c0490058>] (kernel_init+0x28/0x108) > [ 2.821398] [<c0490058>] (kernel_init) from [<c000f268>] (ret_from_fork+0x14/0x2c) > [ 2.828939] ---[ end trace 03cc00e539849d1f ]--- > +Cc Stephen Boyd This is the fix for issue mentioned here: https://lkml.org/lkml/2014/12/22/125 Best regards, Krzysztof > clk_set_rate() tries to take clk's prepare_lock mutex while being in atomic > context entered in sdhci_do_set_ios(). > The solution is inspired by similar situation in sdhci_set_power() also called > from sdhci_do_set_ios(): > > spin_unlock_irq(&host->lock); > mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); > spin_lock_irq(&host->lock); > > Note that since sdhci_s3c_set_clock() sets SDHCI_CLOCK_CARD_EN, proposed change > first resets this bit. It is reset anyway (by setting SDHCI_CLOCK_INT_EN bit > only) after call to clk_set_rate() in order to wait for the clock to stabilize > and is set again as soon as the clock becomes stable. > > Signed-off-by: Paul Osmialowski <p.osmialowsk@xxxxxxxxxxx> > --- > drivers/mmc/host/sdhci-s3c.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c > index c45b893..115f556 100644 > --- a/drivers/mmc/host/sdhci-s3c.c > +++ b/drivers/mmc/host/sdhci-s3c.c > @@ -12,6 +12,7 @@ > * published by the Free Software Foundation. > */ > > +#include <linux/spinlock.h> > #include <linux/delay.h> > #include <linux/dma-mapping.h> > #include <linux/platform_device.h> > @@ -312,7 +313,14 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock) > > sdhci_s3c_set_clock(host, clock); > > + /* Reset SD Clock Enable */ > + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); > + clk &= ~SDHCI_CLOCK_CARD_EN; > + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); > + > + spin_unlock_irq(&host->lock); > ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock); > + spin_lock_irq(&host->lock); > if (ret != 0) { > dev_err(dev, "%s: failed to set clock rate %uHz\n", > mmc_hostname(host->mmc), clock); -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
