dmaengine: Replace zero-length array with flexible-array

There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code should
always use “flexible array members”[1] for these cases. The older style of
one-element or zero-length arrays should no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

diff --git a/drivers/dma/milbeaut-hdmac.c b/drivers/dma/milbeaut-hdmac.c
index 8853d44..a8cfb59 100644 (file)
--- a/drivers/dma/milbeaut-hdmac.c
+++ b/drivers/dma/milbeaut-hdmac.c
@@ -77,7 +77,7 @@ struct milbeaut_hdmac_device {
        struct dma_device ddev;
        struct clk *clk;
        void __iomem *reg_base;
-       struct milbeaut_hdmac_chan channels[0];
+       struct milbeaut_hdmac_chan channels[];
 };
 
 static struct milbeaut_hdmac_chan *

diff --git a/drivers/dma/milbeaut-xdmac.c b/drivers/dma/milbeaut-xdmac.c
index ab3d2f3..85a5972 100644 (file)
--- a/drivers/dma/milbeaut-xdmac.c
+++ b/drivers/dma/milbeaut-xdmac.c
@@ -74,7 +74,7 @@ struct milbeaut_xdmac_chan {
 struct milbeaut_xdmac_device {
        struct dma_device ddev;
        void __iomem *reg_base;
-       struct milbeaut_xdmac_chan channels[0];
+       struct milbeaut_xdmac_chan channels[];
 };
 
 static struct milbeaut_xdmac_chan *

diff --git a/drivers/dma/moxart-dma.c b/drivers/dma/moxart-dma.c
index 4ab493d..347146a 100644 (file)
--- a/drivers/dma/moxart-dma.c
+++ b/drivers/dma/moxart-dma.c
@@ -127,7 +127,7 @@ struct moxart_desc {
        unsigned int                    dma_cycles;
        struct virt_dma_desc            vd;
        uint8_t                         es;
-       struct moxart_sg                sg[0];
+       struct moxart_sg                sg[];
 };
 
 struct moxart_chan {

diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
index c4a5c17..35d81bd 100644 (file)
--- a/drivers/dma/ti/edma.c
+++ b/drivers/dma/ti/edma.c
@@ -211,7 +211,7 @@ struct edma_desc {
        u32                             residue;
        u32                             residue_stat;
 
-       struct edma_pset                pset[0];
+       struct edma_pset                pset[];
 };
 
 struct edma_cc;

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 945b7c6..c91e2dc 100644 (file)
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -170,7 +170,7 @@ struct udma_desc {
        void *metadata; /* pointer to provided metadata buffer (EPIP, PSdata) */
 
        unsigned int hwdesc_count;
-       struct udma_hwdesc hwdesc[0];
+       struct udma_hwdesc hwdesc[];
 };
 
 enum udma_chan_state {

diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index 3938269..68e48bf 100644 (file)
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -88,7 +88,7 @@ struct timb_dma {
        struct dma_device       dma;
        void __iomem            *membase;
        struct tasklet_struct   tasklet;
-       struct timb_dma_chan    channels[0];
+       struct timb_dma_chan    channels[];
 };
 
 static struct device *chan2dev(struct dma_chan *chan)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index e1c0333..6283917 100644 (file)
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -153,7 +153,7 @@ struct dma_interleaved_template {
        bool dst_sgl;
        size_t numf;
        size_t frame_size;
-       struct data_chunk sgl[0];
+       struct data_chunk sgl[];
 };
 
 /**
@@ -535,7 +535,7 @@ struct dmaengine_unmap_data {
        struct device *dev;
        struct kref kref;
        size_t len;
-       dma_addr_t addr[0];
+       dma_addr_t addr[];
 };
 
 struct dma_async_tx_descriptor;