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dma-buf/dma-resv: Respect num_fences when initializing the shared fence list. 

commit bf8975837d upstream.

We hardcode the maximum number of shared fences to 4, instead of
respecting num_fences. Use a minimum of 4, but more if num_fences
is higher.

This seems to have been an oversight when first implementing the
api.

Fixes: 04a5faa8cb ("reservation: update api and add some helpers")
Cc: <stable@vger.kernel.org> # v3.17+
Reported-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201124115707.406917-1-maarten.lankhorst@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Maarten Lankhorst 2020-11-24 12:57:07 +01:00 committed by Greg Kroah-Hartman
parent b16a6a46e0
commit 383c60c16d
1 changed files with 1 additions and 1 deletions
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2
drivers/dma-buf/dma-resv.c
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@ -161,7 +161,7 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
max = max(old->shared_count + num_fences,
old->shared_max * 2);
} else {
max = 4;
max = max(4ul, roundup_pow_of_two(num_fences));
}
new = dma_resv_list_alloc(max);