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drm: Help unconfuse gcc, avoid accidental impossible unsigned comparisons 

drivers/gpu/drm/drm_client_modeset.c: In function ‘drm_client_firmware_config’:
./include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
   __builtin_constant_p((l) > (h)), (l) > (h), 0)))

v2: Add a warning for passing connector_count==0 as this will hit an
infinite loop, so document the invalid parameter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200516212330.13633-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-05-16 22:23:28 +01:00
parent 3df6fad41f
commit 2803aa743f
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/drm_client_modeset.c
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@ -563,7 +563,7 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
struct drm_client_offset *offsets,
bool *enabled, int width, int height)
{
unsigned int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
unsigned long conn_configured, conn_seq, mask;
struct drm_device *dev = client->dev;
int i, j;
@ -577,6 +577,9 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
if (!drm_drv_uses_atomic_modeset(dev))
return false;
if (WARN_ON(count <= 0))
return false;
save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
if (!save_enabled)
return false;