From 36bf51acc89d113f101e40f40af4ab53fbf5b60a Mon Sep 17 00:00:00 2001 From: David Matlack Date: Mon, 11 May 2015 20:40:36 -0700 Subject: [PATCH] staging: slicoss: fix occasionally writing out only half of a dma address curaddrupper caches the last written upper 32-bits of a dma address (the device has one register for the upper 32-bits of all dma address registers). The problem is, not every dma address write checks and sets curaddrupper. This causes the driver to occasionally not write the upper 32-bits of a dma address to the device when it really should. I've seen this manifest particularly when the driver is trying to read config data from the device (RCONFIG) in order to checksum the device's eeprom. Since the device writes its config data to the wrong DMA address the driver reads 0 as the eeprom size and the eeprom checksum fails. This patch fixes the issue by removing curaddrupper and always writing the upper 32-bits of dma addresses. Signed-off-by: David Matlack Signed-off-by: Greg Kroah-Hartman --- drivers/staging/slicoss/slic.h | 1 - drivers/staging/slicoss/slicoss.c | 5 +---- 2 files changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/staging/slicoss/slic.h b/drivers/staging/slicoss/slic.h index 5b23254..67a8c9e 100644 --- a/drivers/staging/slicoss/slic.h +++ b/drivers/staging/slicoss/slic.h @@ -414,7 +414,6 @@ struct adapter { u32 intrregistered; uint isp_initialized; uint gennumber; - u32 curaddrupper; struct slic_shmem *pshmem; dma_addr_t phys_shmem; u32 isrcopy; diff --git a/drivers/staging/slicoss/slicoss.c b/drivers/staging/slicoss/slicoss.c index 39c140c..5f34ebbf 100644 --- a/drivers/staging/slicoss/slicoss.c +++ b/drivers/staging/slicoss/slicoss.c @@ -147,10 +147,7 @@ static inline void slic_reg64_write(struct adapter *adapter, void __iomem *reg, unsigned long flags; spin_lock_irqsave(&adapter->bit64reglock, flags); - if (paddrh != adapter->curaddrupper) { - adapter->curaddrupper = paddrh; - writel(paddrh, regh); - } + writel(paddrh, regh); writel(value, reg); if (flush) mb(); -- 2.7.4