| Message ID | 20201203215106.17450-1-elder@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [net,1/1] net: ipa: pass the correct size when freeing DMA memory | expand |
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@chromium.org> > Tested-by: Sujit Kautkar <sujitka@chromium.org> > Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.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 >
On Thu, 3 Dec 2020 17:28:16 -0600 Bjorn Andersson 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@chromium.org> > > Tested-by: Sujit Kautkar <sujitka@chromium.org> > > Signed-off-by: Alex Elder <elder@linaro.org> > > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Applied, thanks!
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)); }
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@chromium.org> Tested-by: Sujit Kautkar <sujitka@chromium.org> Signed-off-by: Alex Elder <elder@linaro.org> --- drivers/net/ipa/gsi_trans.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) -- 2.20.1