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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2020-11-16 17:21:15 +0100
committerJakub Kicinski <kuba@kernel.org>2020-11-18 16:43:55 -0800
commitf2bcc2fa275b913093ff5b403be5d11342fdb055 (patch)
treed430379b7588e75beddfc0ed2e21d8868ad9618d /include
parent030946fdb99018938feb0e23a3b4f9c3831fb77d (diff)
atm: nicstar: Replace in_interrupt() usage
push_scqe() uses in_interrupt() to figure out if it is allowed to sleep. The usage of in_interrupt() in drivers is phased out and Linus clearly requested that code which changes behaviour depending on context should either be separated or the context be conveyed in an argument passed by the caller, which usually knows the context. Aside of that in_interrupt() is not correct as it does not catch preempt disabled regions which neither can sleep. ns_send() (the only caller of push_scqe()) has the following callers: - vcc_sendmsg() used as proto_ops::sendmsg is expected to be invoked in preemtible context. -> vcc->dev->ops->send() (ns_send()) - atm_vcc::send via atmdev_ops::send either directly (pointer copied by atm_init_aal34() or atm_init_aal5()) or via atm_send_aal0(). This is invoked by drivers (like br2684, clip, pppoatm, ...) which are called from net_device_ops::ndo_start_xmit with BH disabled. Add atmdev_ops::send_bh which is used by callers from BH context (atm_send_aal*()) and if this callback missing then ::send is used instead. Implement this callback in nicstar and use it to replace in_interrupt(). Cc: Chas Williams <3chas3@gmail.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/atmdev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index 5d5ff2203fa2..d7493016cd46 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -186,6 +186,7 @@ struct atmdev_ops { /* only send is required */
void __user *arg);
#endif
int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
+ int (*send_bh)(struct atm_vcc *vcc, struct sk_buff *skb);
int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
void (*phy_put)(struct atm_dev *dev,unsigned char value,
unsigned long addr);