Dear Boris BREZILLON, On Tue, 16 Jul 2013 17:06:48 +0200, Boris BREZILLON wrote: > buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL); > if (!buf) > @@ -389,9 +391,13 @@ static int atmci_regs_show(struct seq_file *s, void *v) > * consistent. > */ > spin_lock_bh(&host->lock); > - clk_enable(host->mck); > + ret = clk_prepare_enable(host->mck); I am not very familiar with the spin_lock_bh() variant, but are you sure we are allowed to sleep within a spin_lock_bh()-protected critical section? Remember that clk_prepare_enable() calls both ->prepare() and ->enable() for the clock, and ->prepare() is allowed to sleep, while ->enable() is guaranteed not to sleep. Therefore, clk_prepare() is usually called at probe time, while clk_enable() is called whenever enabling/disabling the clock is really needed. So not all clk_enable() can transparently be converted into a clk_prepare_enable(). Best regards, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- 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
