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Date: Thu, 3 Dec 2020 17:28:16 -0600 From: Bjorn Andersson <bjorn.andersson@...aro.org> To: Alex Elder <elder@...aro.org> Cc: davem@...emloft.net, kuba@...nel.org, swboyd@...omium.org, sujitka@...omium.org, evgreen@...omium.org, cpratapa@...eaurora.org, subashab@...eaurora.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net 1/1] net: ipa: pass the correct size when freeing DMA memory On Thu 03 Dec 15:51 CST 2020, Alex Elder wrote: > When the coherent memory is freed in gsi_trans_pool_exit_dma(), we > are mistakenly passing the size of a single element in the pool > rather than the actual allocated size. Fix this bug. > > Fixes: 9dd441e4ed575 ("soc: qcom: ipa: GSI transactions") > Reported-by: Stephen Boyd <swboyd@...omium.org> > Tested-by: Sujit Kautkar <sujitka@...omium.org> > Signed-off-by: Alex Elder <elder@...aro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org> Regards, Bjorn > --- > drivers/net/ipa/gsi_trans.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c > index e8599bb948c08..6c3ed5b17b80c 100644 > --- a/drivers/net/ipa/gsi_trans.c > +++ b/drivers/net/ipa/gsi_trans.c > @@ -156,6 +156,9 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool, > /* The allocator will give us a power-of-2 number of pages. But we > * can't guarantee that, so request it. That way we won't waste any > * memory that would be available beyond the required space. > + * > + * Note that gsi_trans_pool_exit_dma() assumes the total allocated > + * size is exactly (count * size). > */ > total_size = get_order(total_size) << PAGE_SHIFT; > > @@ -175,7 +178,9 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool, > > void gsi_trans_pool_exit_dma(struct device *dev, struct gsi_trans_pool *pool) > { > - dma_free_coherent(dev, pool->size, pool->base, pool->addr); > + size_t total_size = pool->count * pool->size; > + > + dma_free_coherent(dev, total_size, pool->base, pool->addr); > memset(pool, 0, sizeof(*pool)); > } > > -- > 2.20.1 >
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