Hi Shawn, On Fri, Jul 05 2013, Shawn Guo wrote: > Generally request_irq() should be called after hardware has been > initialized into a sane state. However, sdhci driver currently calls > request_irq() before sdhci_init(). At least, the following kernel panic > seen on i.MX6 is caused by that. The sdhci controller on i.MX6 may have > noisy glitch on DAT1 line, which will trigger SDIO interrupt handling > once request_irq() is called. But at this point, the SDIO interrupt > handler host->sdio_irq_thread has not been registered yet. Thus, we > see the NULL pointer access with wake_up_process(host->sdio_irq_thread) > in mmc_signal_sdio_irq(). Thanks, pushed to mmc-next for 3.12. - Chris. -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> -- 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
