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SubjectRe: [PATCH] drm: count reaches -1, tested 0
Hi!

Roel Kluin wrote:
> With a postfix decrement count will reach -1 rather than 0,
> subsequent tests fail.
>
This code is about to be abandoned, but if we're going to fix it,
instead of pushing the problem to then next while loop, what about

while (count && condition)
count--;

Can you redo the patch based on that?


Thanks,
Thomas

> Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
> ---
> diff --git a/drivers/gpu/drm/via/via_dma.c b/drivers/gpu/drm/via/via_dma.c
> index 7a339db..600315c 100644
> --- a/drivers/gpu/drm/via/via_dma.c
> +++ b/drivers/gpu/drm/via/via_dma.c
> @@ -481,9 +481,9 @@ static int via_wait_idle(drm_via_private_t * dev_priv)
> {
> int count = 10000000;
>
> - while (!(VIA_READ(VIA_REG_STATUS) & VIA_VR_QUEUE_BUSY) && count--);
> + while (!(VIA_READ(VIA_REG_STATUS) & VIA_VR_QUEUE_BUSY) && --count);
>
> - while (count-- && (VIA_READ(VIA_REG_STATUS) &
> + while (--count && (VIA_READ(VIA_REG_STATUS) &
> (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY |
> VIA_3D_ENG_BUSY))) ;
> return count;
> @@ -705,7 +705,7 @@ static int via_cmdbuf_size(struct drm_device *dev, void *data, struct drm_file *
> switch (d_siz->func) {
> case VIA_CMDBUF_SPACE:
> while (((tmp_size = via_cmdbuf_space(dev_priv)) < d_siz->size)
> - && count--) {
> + && --count) {
> if (!d_siz->wait) {
> break;
> }
> @@ -717,7 +717,7 @@ static int via_cmdbuf_size(struct drm_device *dev, void *data, struct drm_file *
> break;
> case VIA_CMDBUF_LAG:
> while (((tmp_size = via_cmdbuf_lag(dev_priv)) > d_siz->size)
> - && count--) {
> + && --count) {
> if (!d_siz->wait) {
> break;
> }
>
>
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