diff options
| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-12 17:56:42 -0600 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2020-03-30 07:34:57 +0100 |
| commit | a0c8498c076d0338860df7e45e5e6f48158a02d8 (patch) | |
| tree | b0e235568c52a83992405192e82b1bfc5cc13eb8 | |
| parent | c703797c1d5466f9af70bc7692fa49399107e66c (diff) | |
mfd: omap-usb-tll: 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>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/mfd/omap-usb-tll.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index 265f5e350e1c..1cf259a48966 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -99,7 +99,7 @@ struct usbtll_omap { void __iomem *base; int nch; /* num. of channels */ - struct clk *ch_clk[0]; /* must be the last member */ + struct clk *ch_clk[]; /* must be the last member */ }; /*-------------------------------------------------------------------------*/ |