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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-13 03:37:03 +0300
committerVinod Koul <vkoul@kernel.org>2020-02-13 17:45:35 +0300
commit57a8cc725622185576dcd3df718e91fcda1ef5dd (patch)
treec68e3d80ca796a4ab7b9633bed4dee5c9e5c52f9 /drivers/dma/bcm-sba-raid.c
parentff095986e6b449bc095b018388519f1e413a7fa8 (diff)
downloadlinux-57a8cc725622185576dcd3df718e91fcda1ef5dd.tar.xz
dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Link: https://lore.kernel.org/r/20200213003703.GA4177@embeddedor.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/bcm-sba-raid.c')
-rw-r--r--drivers/dma/bcm-sba-raid.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index 275e90fa829d..64239da02e74 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -120,7 +120,7 @@ struct sba_request {
struct brcm_message msg;
struct dma_async_tx_descriptor tx;
/* SBA commands */
- struct brcm_sba_command cmds[0];
+ struct brcm_sba_command cmds[];
};
enum sba_version {