linux-kernel - [PATCH 0/3] Net driver bugs fix and code style

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Message-ID: <1461656126-22226-1-git-send-email-noamca@mellanox.com>
Date:	Tue, 26 Apr 2016 10:35:23 +0300
From:	Noam Camus <noamca@...lanox.com>
To:	<davem@...emloft.net>
CC:	<noamca@...lanox.com>, <linux-kernel@...r.kernel.org>,
	<abrodkin@...opsys.com>, <eladkan@...lanox.com>,
	<talz@...lanox.com>
Subject: [PATCH 0/3] Net driver bugs fix and code style

From: Elad Kanfi <eladkan@...lanox.com>

Summary:
 1. Bug description: TX done interrupts that arrives while interrupts
    are masked, during NAPI poll, will not trigger an interrupt handling.
    Since TX interrupt is of level edge we will lose the TX done interrupt.
    As a result all pending tx frames will get no service.

    Solution: Check if there is a pending tx request after unmasking the
    interrupt and if answer is yes then re-add ourselves to
    the NAPI poll list.

 2. Bug description: CPU-A before sending a frame will set a variable
    to true. CPU-B that executes the tx done interrupt service routine
    might read a non valid value of that variable.

    Solution: Add a memory barrier at the tx sending function. 

 3. In addition, the check of a valid pending tx request was switched
    to an inline function to avoid duplicated code.

Elad Kanfi (3):
  net: nps_enet: code style
  net: nps_enet: Sync access to packet sent flag
  net: nps_enet: bug fix - handle lost tx interrupts

 drivers/net/ethernet/ezchip/nps_enet.c |   34 +++++++++++++++++++++++++++----
 1 files changed, 29 insertions(+), 5 deletions(-)