On Tue, Oct 26, 2021 at 10:34:37AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The new driver incorrectly unwinds after errors, as clang points out:
>
> drivers/dma-buf/st-dma-resv.c:295:7: error: variable 'i' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
> if (r) {
> ^
> drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here
> while (i--)
> ^
> drivers/dma-buf/st-dma-resv.c:295:3: note: remove the 'if' if its condition is always false
> if (r) {
> ^~~~~~~~
> drivers/dma-buf/st-dma-resv.c:288:6: error: variable 'i' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
> if (r) {
> ^
> drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here
> while (i--)
> ^
> drivers/dma-buf/st-dma-resv.c:288:2: note: remove the 'if' if its condition is always false
> if (r) {
> ^~~~~~~~
> drivers/dma-buf/st-dma-resv.c:280:10: note: initialize the variable 'i' to silence this warning
> int r, i;
> ^
> = 0
>
> Skip cleaning up the bits that have not been allocated at this point.
>
> Fixes: 1d51775cd3f5 ("dma-buf: add dma_resv selftest v4")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> ---
> I'm not familiar with these interfaces, so I'm just guessing where
> we should jump after an error, please double-check and fix if necessary.
> ---
> drivers/dma-buf/st-dma-resv.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
> index 6f3ba756da3e..bc32b3eedcb6 100644
> --- a/drivers/dma-buf/st-dma-resv.c
> +++ b/drivers/dma-buf/st-dma-resv.c
> @@ -287,7 +287,7 @@ static int test_get_fences(void *arg, bool shared)
> r = dma_resv_lock(&resv, NULL);
> if (r) {
> pr_err("Resv locking failed\n");
> - goto err_free;
> + goto err_resv;
> }
>
> if (shared) {
> @@ -295,7 +295,7 @@ static int test_get_fences(void *arg, bool shared)
> if (r) {
> pr_err("Resv shared slot allocation failed\n");
> dma_resv_unlock(&resv);
> - goto err_free;
> + goto err_resv;
> }
>
> dma_resv_add_shared_fence(&resv, f);
> @@ -336,6 +336,7 @@ static int test_get_fences(void *arg, bool shared)
> while (i--)
> dma_fence_put(fences[i]);
> kfree(fences);
> +err_resv:
> dma_resv_fini(&resv);
> dma_fence_put(f);
> return r;
> --
> 2.29.2
>
