From 56968d0c1a920eb165c06318f5c458724e1df0af Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Tue, 25 Nov 2008 14:23:40 +0000 Subject: wusb: whci-hcd shouldn't do ASL/PZL updates while channel is inactive ASL/PZL updates while the WUSB channel is inactive (i.e., the PZL and ASL are stopped) may not complete. This causes hangs when removing the whci-hcd module if a device is still connected (removing the device does an endpoint_disable which results in an ASL update to remove the qset). If the WUSB channel is inactive the update can simply be skipped as the WHC doesn't care about the state of the ASL/PZL. Signed-off-by: David Vrabel --- drivers/usb/host/whci/asl.c | 21 ++++++++++++++++++--- drivers/usb/host/whci/pzl.c | 21 ++++++++++++++++++--- 2 files changed, 36 insertions(+), 6 deletions(-) (limited to 'drivers/usb/host/whci') diff --git a/drivers/usb/host/whci/asl.c b/drivers/usb/host/whci/asl.c index 4d7078e5057..ba99a7a3f81 100644 --- a/drivers/usb/host/whci/asl.c +++ b/drivers/usb/host/whci/asl.c @@ -179,11 +179,26 @@ void asl_stop(struct whc *whc) 1000, "stop ASL"); } +/** + * asl_update - request an ASL update and wait for the hardware to be synced + * @whc: the WHCI HC + * @wusbcmd: WUSBCMD value to start the update. + * + * If the WUSB HC is inactive (i.e., the ASL is stopped) then the + * update must be skipped as the hardware may not respond to update + * requests. + */ void asl_update(struct whc *whc, uint32_t wusbcmd) { - whc_write_wusbcmd(whc, wusbcmd, wusbcmd); - wait_event(whc->async_list_wq, - (le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0); + struct wusbhc *wusbhc = &whc->wusbhc; + + mutex_lock(&wusbhc->mutex); + if (wusbhc->active) { + whc_write_wusbcmd(whc, wusbcmd, wusbcmd); + wait_event(whc->async_list_wq, + (le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0); + } + mutex_unlock(&wusbhc->mutex); } /** diff --git a/drivers/usb/host/whci/pzl.c b/drivers/usb/host/whci/pzl.c index 8d62df0c330..34d3a0aeab2 100644 --- a/drivers/usb/host/whci/pzl.c +++ b/drivers/usb/host/whci/pzl.c @@ -195,11 +195,26 @@ void pzl_stop(struct whc *whc) 1000, "stop PZL"); } +/** + * pzl_update - request a PZL update and wait for the hardware to be synced + * @whc: the WHCI HC + * @wusbcmd: WUSBCMD value to start the update. + * + * If the WUSB HC is inactive (i.e., the PZL is stopped) then the + * update must be skipped as the hardware may not respond to update + * requests. + */ void pzl_update(struct whc *whc, uint32_t wusbcmd) { - whc_write_wusbcmd(whc, wusbcmd, wusbcmd); - wait_event(whc->periodic_list_wq, - (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0); + struct wusbhc *wusbhc = &whc->wusbhc; + + mutex_lock(&wusbhc->mutex); + if (wusbhc->active) { + whc_write_wusbcmd(whc, wusbcmd, wusbcmd); + wait_event(whc->periodic_list_wq, + (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0); + } + mutex_unlock(&wusbhc->mutex); } static void update_pzl_hw_view(struct whc *whc) -- cgit v1.2.3