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Various drivers use xmit_lock internally to synchronise with their transmission routines. They do so without setting xmit_lock_owner. This is fine as long as netpoll is not in use. With netpoll it is possible for deadlocks to occur if xmit_lock_owner isn't set. This is because if a printk occurs while xmit_lock is held and xmit_lock_owner is not set can cause netpoll to attempt to take xmit_lock recursively. While it is possible to resolve this by getting netpoll to use trylock, it is suboptimal because netpoll's sole objective is to maximise the chance of getting the printk out on the wire. So delaying or dropping the message is to be avoided as much as possible. So the only alternative is to always set xmit_lock_owner. The following patch does this by introducing the netif_tx_lock family of functions that take care of setting/unsetting xmit_lock_owner. I renamed xmit_lock to _xmit_lock to indicate that it should not be used directly. I didn't provide irq versions of the netif_tx_lock functions since xmit_lock is meant to be a BH-disabling lock. This is pretty much a straight text substitution except for a small bug fix in winbond. It currently uses netif_stop_queue/spin_unlock_wait to stop transmission. This is unsafe as an IRQ can potentially wake up the queue. So it is safer to use netif_tx_disable. The hamradio bits used spin_lock_irq but it is unnecessary as xmit_lock must never be taken in an IRQ handler. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| .. | ||
| bcm43xx | ||
| hostap | ||
| prism54 | ||
| airo_cs.c | ||
| airo.c | ||
| airo.h | ||
| airport.c | ||
| arlan-main.c | ||
| arlan-proc.c | ||
| arlan.h | ||
| atmel_cs.c | ||
| atmel_pci.c | ||
| atmel.c | ||
| atmel.h | ||
| hermes_rid.h | ||
| hermes.c | ||
| hermes.h | ||
| i82586.h | ||
| i82593.h | ||
| ipw2100.c | ||
| ipw2100.h | ||
| ipw2200.c | ||
| ipw2200.h | ||
| Kconfig | ||
| Makefile | ||
| netwave_cs.c | ||
| orinoco_cs.c | ||
| orinoco_nortel.c | ||
| orinoco_pci.c | ||
| orinoco_plx.c | ||
| orinoco_tmd.c | ||
| orinoco.c | ||
| orinoco.h | ||
| ray_cs.c | ||
| ray_cs.h | ||
| rayctl.h | ||
| README | ||
| spectrum_cs.c | ||
| strip.c | ||
| todo.txt | ||
| wavelan_cs.c | ||
| wavelan_cs.h | ||
| wavelan_cs.p.h | ||
| wavelan.c | ||
| wavelan.h | ||
| wavelan.p.h | ||
| wl3501_cs.c | ||
| wl3501.h | ||
README ------ This directory is mostly for Wireless LAN drivers, in their various incarnations (ISA, PCI, Pcmcia...). This separate directory is needed because a lot of driver work on different bus (typically PCI + Pcmcia) and share 95% of the code. This allow the code and the config options to be in one single place instead of scattered all over the driver tree, which is never 100% satisfactory. Note : if you want more info on the topic of Wireless LANs, you are kindly invited to have a look at the Wireless Howto : http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/ Some Wireless LAN drivers, like orinoco_cs, require the use of Wireless Tools to be configured : http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html Special notes for distribution maintainers : 1) wvlan_cs will be discontinued soon in favor of orinoco_cs 2) Please add Wireless Tools support in your scripts Have fun... Jean