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Herbert Xu 932ff279a4 [NET]: Add netif_tx_lock ... 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>		19 years ago
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b2c2	V4L/DVB (4037): Make the bridge devices that depend on I2C dependant on I2C	19 years ago
bt8xx	V4L/DVB (4040a): Fix the following section warnings:	19 years ago
cinergyT2	V4L/DVB (3743): Fix some more potential oopses	19 years ago
dvb-core	[NET]: Add netif_tx_lock	19 years ago
dvb-usb	V4L/DVB (4037): Make the bridge devices that depend on I2C dependant on I2C	19 years ago
frontends	V4L/DVB (3829): Fix frequency values in the ranges structures of the LG TDVS H06xF tuners	19 years ago
pluto2	[PATCH] V4L/DVB (4045): Fixes recursive dependency for I2C	19 years ago
ttpci	V4L/DVB (4037): Make the bridge devices that depend on I2C dependant on I2C	19 years ago
ttusb-budget	V4L/DVB (3743): Fix some more potential oopses	19 years ago
ttusb-dec	V4L/DVB (3318b): sem2mutex: drivers/media/, #2	19 years ago
Kconfig	V4L/DVB (4037): Make the bridge devices that depend on I2C dependant on I2C	19 years ago
Makefile	[PATCH] dvb: add Pluto2 driver	20 years ago