| Message ID | 20210824105302.25382-2-kishon@ti.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Fix cold plugged USB device on certain PCIe USB cards | expand |
On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote: > No functional change. Since configuration to stop HCD is invoked from > multiple places, group all of them in usb_stop_hcd(). > > Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> > --- > drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++----------------- > 1 file changed, 25 insertions(+), 17 deletions(-) > > diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c > index 0f8b7c93310e..c036ba5311b3 100644 > --- a/drivers/usb/core/hcd.c > +++ b/drivers/usb/core/hcd.c > @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd) > usb_put_dev(rhdev); > } > > +/** > + * usb_stop_hcd - Halt the HCD > + * @hcd: the usb_hcd that has to be halted > + * > + * Stop the timer and invoke ->stop() callback on the HCD > + */ > +static void usb_stop_hcd(struct usb_hcd *hcd) > +{ > + if (!hcd) > + return; That's impossible to hit, so no need to check for it, right? thanks, greg k-h
Hi Greg, On 24/08/21 6:36 pm, Greg Kroah-Hartman wrote: > On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote: >> No functional change. Since configuration to stop HCD is invoked from >> multiple places, group all of them in usb_stop_hcd(). >> >> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> >> --- >> drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++----------------- >> 1 file changed, 25 insertions(+), 17 deletions(-) >> >> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c >> index 0f8b7c93310e..c036ba5311b3 100644 >> --- a/drivers/usb/core/hcd.c >> +++ b/drivers/usb/core/hcd.c >> @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd) >> usb_put_dev(rhdev); >> } >> >> +/** >> + * usb_stop_hcd - Halt the HCD >> + * @hcd: the usb_hcd that has to be halted >> + * >> + * Stop the timer and invoke ->stop() callback on the HCD >> + */ >> +static void usb_stop_hcd(struct usb_hcd *hcd) >> +{ >> + if (!hcd) >> + return; > > That's impossible to hit, so no need to check for it, right? Patch 3 of this series adds support for registering roothub of shared HCD. So after that patch there can be a case where shared_hcd is NULL. The other option would be to check for non-null value in hcd and then invoke usb_stop_hcd(). Thanks Kishon
On Tue, Aug 24, 2021 at 08:48:45PM +0530, Kishon Vijay Abraham I wrote: > Hi Greg, > > On 24/08/21 6:36 pm, Greg Kroah-Hartman wrote: > > On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote: > >> No functional change. Since configuration to stop HCD is invoked from > >> multiple places, group all of them in usb_stop_hcd(). > >> > >> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> > >> --- > >> drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++----------------- > >> 1 file changed, 25 insertions(+), 17 deletions(-) > >> > >> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c > >> index 0f8b7c93310e..c036ba5311b3 100644 > >> --- a/drivers/usb/core/hcd.c > >> +++ b/drivers/usb/core/hcd.c > >> @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd) > >> usb_put_dev(rhdev); > >> } > >> > >> +/** > >> + * usb_stop_hcd - Halt the HCD > >> + * @hcd: the usb_hcd that has to be halted > >> + * > >> + * Stop the timer and invoke ->stop() callback on the HCD > >> + */ > >> +static void usb_stop_hcd(struct usb_hcd *hcd) > >> +{ > >> + if (!hcd) > >> + return; > > > > That's impossible to hit, so no need to check for it, right? > > Patch 3 of this series adds support for registering roothub of shared > HCD. So after that patch there can be a case where shared_hcd is NULL. > The other option would be to check for non-null value in hcd and then > invoke usb_stop_hcd(). Then add the check when you need it please. thanks, greg k-h
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 0f8b7c93310e..c036ba5311b3 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd) usb_put_dev(rhdev); } +/** + * usb_stop_hcd - Halt the HCD + * @hcd: the usb_hcd that has to be halted + * + * Stop the timer and invoke ->stop() callback on the HCD + */ +static void usb_stop_hcd(struct usb_hcd *hcd) +{ + if (!hcd) + return; + + hcd->rh_pollable = 0; + clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); + del_timer_sync(&hcd->rh_timer); + + hcd->driver->stop(hcd); + hcd->state = HC_STATE_HALT; + + /* In case the HCD restarted the timer, stop it again. */ + clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); + del_timer_sync(&hcd->rh_timer); +} + /** * usb_add_hcd - finish generic HCD structure initialization and register * @hcd: the usb_hcd structure to initialize @@ -2946,13 +2969,7 @@ int usb_add_hcd(struct usb_hcd *hcd, return retval; err_register_root_hub: - hcd->rh_pollable = 0; - clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); - del_timer_sync(&hcd->rh_timer); - hcd->driver->stop(hcd); - hcd->state = HC_STATE_HALT; - clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); - del_timer_sync(&hcd->rh_timer); + usb_stop_hcd(hcd); err_hcd_driver_start: if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0) free_irq(irqnum, hcd); @@ -3022,16 +3039,7 @@ void usb_remove_hcd(struct usb_hcd *hcd) * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke * the hub_status_data() callback. */ - hcd->rh_pollable = 0; - clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); - del_timer_sync(&hcd->rh_timer); - - hcd->driver->stop(hcd); - hcd->state = HC_STATE_HALT; - - /* In case the HCD restarted the timer, stop it again. */ - clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); - del_timer_sync(&hcd->rh_timer); + usb_stop_hcd(hcd); if (usb_hcd_is_primary_hcd(hcd)) { if (hcd->irq > 0)
No functional change. Since configuration to stop HCD is invoked from multiple places, group all of them in usb_stop_hcd(). Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> --- drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++----------------- 1 file changed, 25 insertions(+), 17 deletions(-)