From: Prabu Thangamuthu Date: Thu, 28 May 2015 12:21:06 +0000 (+0000) Subject: mmc: dw_mmc: insmod followed by rmmod will hung for eMMC X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=048fd7e665cef45630102dc8bf81971fbc82e52c;p=deliverable%2Flinux.git mmc: dw_mmc: insmod followed by rmmod will hung for eMMC Remove module of dw_mmc driver will hung for eMMC devices if we follow the steps which are listed below, insmod dw_mmc.ko insmod dw_mmc-pci.ko rmmod dw_mmc-pci.ko The root cause for this issue is, dw_mci_remove() will disable all the interrupts by programming 0x0 to INTMASK register then it will call dw_mci_cleanup_slot(). But dw_mci_cleanup_slot() is issuing CMD6 to disable the eMMC boot partition and it is 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 Signed-off-by: Jaehoon Chung Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55179f1001fb..40e9d8e45f25 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2926,15 +2926,15 @@ 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);