mfd: Fix omap usbhs crash when rmmoding ehci or ohci

The disabling of clocks and freeing GPIO are changed
to fix the occurrence of the crash of rmmod of ehci and ohci
drivers. The GPIOs should be freed after the spin locks are
unlocked.

Signed-off-by: Keshava Munegowda <keshava_mgowda@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Cc: stable@kernel.org
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 3ab9ffa..55c5d47 100644 (file)
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -994,22 +994,33 @@ static void usbhs_disable(struct device *dev)
                        dev_dbg(dev, "operation timed out\n");
        }
 
-       if (pdata->ehci_data->phy_reset) {
-               if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
-                       gpio_free(pdata->ehci_data->reset_gpio_port[0]);
-
-               if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
-                       gpio_free(pdata->ehci_data->reset_gpio_port[1]);
+       if (is_omap_usbhs_rev2(omap)) {
+               if (is_ehci_tll_mode(pdata->port_mode[0]))
+                       clk_enable(omap->usbtll_p1_fck);
+               if (is_ehci_tll_mode(pdata->port_mode[1]))
+                       clk_enable(omap->usbtll_p2_fck);
+               clk_disable(omap->utmi_p2_fck);
+               clk_disable(omap->utmi_p1_fck);
        }
 
-       clk_disable(omap->utmi_p2_fck);
-       clk_disable(omap->utmi_p1_fck);
        clk_disable(omap->usbtll_ick);
        clk_disable(omap->usbtll_fck);
        clk_disable(omap->usbhost_fs_fck);
        clk_disable(omap->usbhost_hs_fck);
        clk_disable(omap->usbhost_ick);
 
+       /* The gpio_free migh sleep; so unlock the spinlock */
+       spin_unlock_irqrestore(&omap->lock, flags);
+
+       if (pdata->ehci_data->phy_reset) {
+               if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
+                       gpio_free(pdata->ehci_data->reset_gpio_port[0]);
+
+               if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
+                       gpio_free(pdata->ehci_data->reset_gpio_port[1]);
+       }
+       return;
+
 end_disble:
        spin_unlock_irqrestore(&omap->lock, flags);
 }