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drm/i915/gvt: verify functions types in new_mmio_info()

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The current prototype of new_mmio_info() uses void* for parameters read
and write, which are functions with precise calling conventions
(argument types and return type). Write down these conventions in
new_mmio_info() definition.

This has been reported by the following warnings when clang is used to
build the kernel:

    drivers/gpu/drm/i915/gvt/handlers.c:124:21: error: pointer type
    mismatch ('void *' and 'int (*)(struct intel_vgpu *, unsigned int,
    void *, unsigned int)') [-Werror,-Wpointer-type-mismatch]
            info->read = read ? read : intel_vgpu_default_mmio_read;
                              ^ ~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    drivers/gpu/drm/i915/gvt/handlers.c:125:23: error: pointer type
    mismatch ('void *' and 'int (*)(struct intel_vgpu *, unsigned int,
    void *, unsigned int)') [-Werror,-Wpointer-type-mismatch]
            info->write = write ? write : intel_vgpu_default_mmio_write;
                                ^ ~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This allows the compiler to detect that sbi_ctl_mmio_write() returns a
"bool" value instead of an expected "int" one. Fix this.

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Nicolas Iooss 2016-12-26 14:52:23 +01:00 committed by Zhenyu Wang
parent a121103c92
commit 3e70c5d6ea
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/gvt/handlers.c
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@ -93,7 +93,8 @@ static void write_vreg(struct intel_vgpu *vgpu, unsigned int offset,
static int new_mmio_info(struct intel_gvt *gvt,
u32 offset, u32 flags, u32 size,
u32 addr_mask, u32 ro_mask, u32 device,
void *read, void *write)
int (*read)(struct intel_vgpu *, unsigned int, void *, unsigned int),
int (*write)(struct intel_vgpu *, unsigned int, void *, unsigned int))
{
struct intel_gvt_mmio_info *info, *p;
u32 start, end, i;
@ -974,7 +975,7 @@ static int sbi_data_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
return 0;
}
static bool sbi_ctl_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
static int sbi_ctl_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
void *p_data, unsigned int bytes)
{
u32 data;