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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 <dmatlack@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Matlack 2015-05-11 20:40:36 -07:00 committed by Greg Kroah-Hartman
parent eafe600205
commit 36bf51acc8
2 changed files with 1 additions and 5 deletions
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1
drivers/staging/slicoss/slic.h
View File

@ -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;

5
drivers/staging/slicoss/slicoss.c
View File

@ -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();