From f07600cf9eb3ee92777b2001e564faa413144a99 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Wed, 30 May 2007 15:38:16 -0400 Subject: USB: add reset_resume method This patch (as918) introduces a new USB driver method: reset_resume. It is called when a device needs to be reset as part of a resume procedure (whether because of a device quirk or because of the USB-Persist facility), thereby taking over a role formerly assigned to the post_reset method. As a consequence, post_reset no longer needs an argument indicating whether it is being called as part of a reset-resume. This separation of functions makes the code clearer. In addition, the pre_reset and post_reset method return types are changed; they now must return an error code. The return value is unused at present, but at some later time we may unbind drivers and re-probe if they encounter an error during reset handling. The existing pre_reset and post_reset methods in the usbhid, usb-storage, and hub drivers are updated to match the new requirements. For usbhid the post_reset routine is also used for reset_resume (duplicate method pointers); for the other drivers a new reset_resume routine is added. The change to hub.c looks bigger than it really is, because mark_children_for_reset_resume() gets moved down next to the new hub_reset_resume() routine. A minor change to usb-storage makes the usb_stor_report_bus_reset() routine acquire the host lock instead of requiring the caller to hold it already. Signed-off-by: Alan Stern Signed-off-by: Jiri Kosina CC: Matthew Dharm Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/usb.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) (limited to 'drivers/usb/storage/usb.c') diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index be4cd8fe4ce..00521f1d6a6 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -219,6 +219,20 @@ static int storage_resume(struct usb_interface *iface) return 0; } +static int storage_reset_resume(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + US_DEBUGP("%s\n", __FUNCTION__); + + /* Report the reset to the SCSI core */ + usb_stor_report_bus_reset(us); + + /* FIXME: Notify the subdrivers that they need to reinitialize + * the device */ + return 0; +} + #endif /* CONFIG_PM */ /* @@ -226,7 +240,7 @@ static int storage_resume(struct usb_interface *iface) * a USB port reset, whether from this driver or a different one. */ -static void storage_pre_reset(struct usb_interface *iface) +static int storage_pre_reset(struct usb_interface *iface) { struct us_data *us = usb_get_intfdata(iface); @@ -234,26 +248,23 @@ static void storage_pre_reset(struct usb_interface *iface) /* Make sure no command runs during the reset */ mutex_lock(&us->dev_mutex); + return 0; } -static void storage_post_reset(struct usb_interface *iface, int reset_resume) +static int storage_post_reset(struct usb_interface *iface) { struct us_data *us = usb_get_intfdata(iface); US_DEBUGP("%s\n", __FUNCTION__); /* Report the reset to the SCSI core */ - scsi_lock(us_to_host(us)); usb_stor_report_bus_reset(us); - scsi_unlock(us_to_host(us)); /* FIXME: Notify the subdrivers that they need to reinitialize * the device */ - /* If this is a reset-resume then the pre_reset routine wasn't - * called, so we don't need to unlock the mutex. */ - if (!reset_resume) - mutex_unlock(&us->dev_mutex); + mutex_unlock(&us->dev_mutex); + return 0; } /* @@ -1061,6 +1072,7 @@ static struct usb_driver usb_storage_driver = { #ifdef CONFIG_PM .suspend = storage_suspend, .resume = storage_resume, + .reset_resume = storage_reset_resume, #endif .pre_reset = storage_pre_reset, .post_reset = storage_post_reset, -- cgit v1.2.3