diff options
| author | Jeya R <jeyr@codeaurora.org> | 2021-09-23 11:37:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-05 17:11:03 +0300 |
| commit | 847afd7bd5607ca974e562d7b2b8f800c4594fe6 (patch) | |
| tree | 35df8da61bffa6c72c5aa8b86b25932c5a9a928a /drivers/misc | |
| parent | 304b0ba0a21b216683bc887d18dc5ad8d7d94752 (diff) | |
| download | linux-847afd7bd5607ca974e562d7b2b8f800c4594fe6.tar.xz | |
misc: fastrpc: copy to user only for non-DMA-BUF heap buffers
fastrpc_put_args is copying all the output buffers to user. For large
number of output context buffers, this might cause performance
degradation. Copying is not needed for DMA-BUF heap buffers.
Signed-off-by: Jeya R <jeyr@codeaurora.org>
Link: https://lore.kernel.org/r/1632386272-18139-1-git-send-email-jeyr@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/fastrpc.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index bd7811e3f761..e0d0c894c5fd 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -890,15 +890,17 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx, inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); for (i = inbufs; i < ctx->nbufs; ++i) { - void *src = (void *)(uintptr_t)rpra[i].pv; - void *dst = (void *)(uintptr_t)ctx->args[i].ptr; - u64 len = rpra[i].len; + if (!ctx->maps[i]) { + void *src = (void *)(uintptr_t)rpra[i].pv; + void *dst = (void *)(uintptr_t)ctx->args[i].ptr; + u64 len = rpra[i].len; - if (!kernel) { - if (copy_to_user((void __user *)dst, src, len)) - return -EFAULT; - } else { - memcpy(dst, src, len); + if (!kernel) { + if (copy_to_user((void __user *)dst, src, len)) + return -EFAULT; + } else { + memcpy(dst, src, len); + } } } |