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authorAlexey Brodkin <Alexey.Brodkin@synopsys.com>2015-06-24 11:47:41 +0300
committerDavid S. Miller <davem@davemloft.net>2015-06-24 02:38:53 -0700
commitf1590670ce069eefeb93916391a67643e6ad1630 (patch)
treefa6e866515a1a9997d78300baff581ce08cc2394 /net
parent34b99df4e6256ddafb663c6de0711dceceddfe0e (diff)
downloadlinux-f1590670ce069eefeb93916391a67643e6ad1630.tar.gz
stmmac: troubleshoot unexpected bits in des0 & des1
Current implementation of descriptor init procedure only takes care about setting/clearing ownership flag in "des0"/"des1" fields while it is perfectly possible to get unexpected bits set because of the following factors: [1] On driver probe underlying memory allocated with dma_alloc_coherent() might not be zeroed and so it will be filled with garbage. [2] During driver operation some bits could be set by SD/MMC controller (for example error flags etc). And unexpected and/or randomly set flags in "des0"/"des1" fields may lead to unpredictable behavior of GMAC DMA block. This change addresses both items above with: [1] Use of dma_zalloc_coherent() instead of simple dma_alloc_coherent() to make sure allocated memory is zeroed. That shouldn't affect performance because this allocation only happens once on driver probe. [2] Do explicit zeroing of both "des0" and "des1" fields of all buffer descriptors during initialization of DMA transfer. And while at it fixed identation of dma_free_coherent() counterpart as well. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com> Cc: arc-linux-dev@synopsys.com Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Cc: David Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
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