Removing dw_mmc driver immediately after inserting the dw_mmc driver is getting hung for eMMC device. Root cause for this issue is, dw_mci_remove will disable all the interrupts then it will call dw_mci_cleanup_slot. dw_mci_cleanup_slot is issuing CMD6 to disable boot partition access and it's waiting for command complete interrupt. Since INTMASK was already cleared by dw_mci_remove, command complete interrupt is not reaching the system. This leads to process hung.
Signed-off-by: Prabu Thangamuthu <[email protected]> --- drivers/mmc/host/dw_mmc.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 5f5adaf..f0a0aff 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2941,15 +2941,15 @@ void dw_mci_remove(struct dw_mci *host) { int i; - mci_writel(host, RINTSTS, 0xFFFFFFFF); - mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ - for (i = 0; i < host->num_slots; i++) { dev_dbg(host->dev, "remove slot %d\n", i); if (host->slot[i]) dw_mci_cleanup_slot(host->slot[i], i); } + mci_writel(host, RINTSTS, 0xFFFFFFFF); + mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ + /* disable clock to CIU */ mci_writel(host, CLKENA, 0); mci_writel(host, CLKSRC, 0); -- 1.7.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
