Hi, As we are going to run URB->complete() in tasklet context[1][2], and hard interrupt may be enabled when running URB completion handler[3], so we might need to disable interrupt when acquiring one lock in the completion handler for the below reasons:
- URB->complete() holds a subsystem wide lock which may be acquired in another hard irq context, and the subsystem wide lock is acquired by spin_lock()/read_lock()/write_lock() in complete() - URB->complete() holds a private lock with spin_lock()/read_lock()/write_lock() but driver may export APIs to make other drivers acquire the same private lock in its interrupt handler. For the sake of safety and making the change simple, this patch set converts all spin_lock()/read_lock()/write_lock() in completion handler path into their irqsave version mechanically. But if you are sure the above two cases do not happen in your driver, please let me know and I can drop the unnecessary change. Also if you find some conversions are missed, also please let me know so that I can add it in the next round. [1], USB: URB documentation: claim complete() will be run with IRQs enabled https://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=85721d45261c4be684730c7509a59daa6cda30d8 [2], USB: HCD: support giveback of URB in tasklet context https://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=94dfd7edfd5c9b605caf7b562de7a813d216e011 [3], http://marc.info/?l=linux-usb&m=137286330626363&w=2 V1: - rename patchset title - add missed changes on 'usb_skeleon and usb sg lib' - remove several sound usb drivers which have been done via sound tree - some patch style fix - replace snd_pcm_stream_lock with snd_pcm_stream_lock_irqsave for related a/v drivers Cc: linux-in...@vger.kernel.org Cc: linux-blueto...@vger.kernel.org Cc: net...@vger.kernel.org Cc: linux-wirel...@vger.kernel.org Cc: linux-me...@vger.kernel.org Cc: alsa-de...@alsa-project.org drivers/bluetooth/bfusb.c | 12 ++++---- drivers/bluetooth/btusb.c | 5 ++-- drivers/hid/usbhid/hid-core.c | 5 ++-- drivers/input/misc/cm109.c | 10 ++++--- drivers/isdn/hardware/mISDN/hfcsusb.c | 36 ++++++++++++----------- drivers/media/dvb-core/dvb_demux.c | 17 +++++++---- drivers/media/usb/cx231xx/cx231xx-audio.c | 10 ++++--- drivers/media/usb/cx231xx/cx231xx-core.c | 10 ++++--- drivers/media/usb/cx231xx/cx231xx-vbi.c | 5 ++-- drivers/media/usb/em28xx/em28xx-audio.c | 5 ++-- drivers/media/usb/em28xx/em28xx-core.c | 5 ++-- drivers/media/usb/sn9c102/sn9c102_core.c | 7 +++-- drivers/media/usb/tlg2300/pd-alsa.c | 5 ++-- drivers/media/usb/tlg2300/pd-video.c | 5 ++-- drivers/media/usb/tm6000/tm6000-video.c | 5 ++-- drivers/net/usb/cdc-phonet.c | 5 ++-- drivers/net/usb/hso.c | 38 ++++++++++++++----------- drivers/net/usb/kaweth.c | 7 +++-- drivers/net/usb/rtl8150.c | 5 ++-- drivers/net/wireless/ath/ath9k/hif_usb.c | 29 ++++++++++--------- drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 9 +++--- drivers/net/wireless/ath/ath9k/wmi.c | 11 +++---- drivers/net/wireless/ath/carl9170/rx.c | 5 ++-- drivers/net/wireless/libertas/if_usb.c | 5 ++-- drivers/net/wireless/libertas_tf/if_usb.c | 6 ++-- drivers/net/wireless/zd1211rw/zd_usb.c | 21 ++++++++------ drivers/staging/bcm/InterfaceRx.c | 5 ++-- drivers/staging/btmtk_usb/btmtk_usb.c | 5 ++-- drivers/staging/ced1401/usb1401.c | 35 ++++++++++++----------- drivers/staging/vt6656/usbpipe.c | 9 +++--- drivers/usb/class/cdc-wdm.c | 16 +++++++---- drivers/usb/class/usblp.c | 10 ++++--- drivers/usb/core/devio.c | 5 ++-- drivers/usb/core/message.c | 5 ++-- drivers/usb/misc/adutux.c | 10 ++++--- drivers/usb/misc/iowarrior.c | 5 ++-- drivers/usb/misc/ldusb.c | 7 +++-- drivers/usb/misc/legousbtower.c | 6 ++-- drivers/usb/misc/usbtest.c | 10 ++++--- drivers/usb/misc/uss720.c | 7 ++++- drivers/usb/serial/cyberjack.c | 15 ++++++---- drivers/usb/serial/digi_acceleport.c | 23 ++++++++------- drivers/usb/serial/io_edgeport.c | 14 +++++---- drivers/usb/serial/io_ti.c | 5 ++-- drivers/usb/serial/mos7720.c | 5 ++-- drivers/usb/serial/mos7840.c | 5 ++-- drivers/usb/serial/quatech2.c | 5 ++-- drivers/usb/serial/sierra.c | 9 +++--- drivers/usb/serial/symbolserial.c | 5 ++-- drivers/usb/serial/ti_usb_3410_5052.c | 9 +++--- drivers/usb/serial/usb_wwan.c | 5 ++-- drivers/usb/usb-skeleton.c | 11 ++++--- sound/usb/caiaq/audio.c | 5 ++-- sound/usb/midi.c | 5 ++-- 54 files changed, 318 insertions(+), 221 deletions(-) Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
