sdhci_s3c_set_clock is called from sdhci_do_set_ios with interrupts disabled, and this calls into sdhci_s3c_consider_clock(). The patch "mmc: sdhci-s3c: Cache bus clock rates" addressed some scheduling while atomic in this function, but there are more issues here, seen while testing 3.16-rc2 on exynos4412: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:103 in_atomic(): 1, irqs_disabled(): 128, pid: 75, name: mmcqd/0 Preemption disabled at:[< (null)>] (null) CPU: 0 PID: 75 Comm: mmcqd/0 Not tainted 3.16.0-rc2-00028-ge9fe7eb-dirty #77 [<c0016140>] (unwind_backtrace) from [<c0011e14>] (show_stack+0x10/0x14) [<c0011e14>] (show_stack) from [<c05ce8a8>] (dump_stack+0x84/0xc4) [<c05ce8a8>] (dump_stack) from [<c05d2de0>] (mutex_lock+0x1c/0x3c) [<c05d2de0>] (mutex_lock) from [<c046214c>] (clk_prepare_lock+0x6c/0xf4) [<c046214c>] (clk_prepare_lock) from [<c04625ac>] (clk_round_rate+0x10/0x2c) [<c04625ac>] (clk_round_rate) from [<c0447628>] (sdhci_s3c_set_clock+0x4c/0x1e8) [<c0447628>] (sdhci_s3c_set_clock) from [<c0447818>] (sdhci_cmu_set_clock+0x54/0x140) [<c0447818>] (sdhci_cmu_set_clock) from [<c0443a38>] (sdhci_do_set_ios+0x138/0x58c) [<c0443a38>] (sdhci_do_set_ios) from [<c0443864>] (sdhci_set_ios+0x28/0x34) clk_round_rate cannot be called here because it takes a mutex. sdhci_s3c_set_clock() also calls into clk_prepare_enable() which looks like it could trigger this problem too. Daniel -- 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
