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Subject[PATCH][V2] drm: qxl: remove pr_info message, stops log spamming
Date
From: Colin Ian King <colin.king@canonical.com>

Simply mmap'ing /dev/dri/card0 repeatedly will spam the kernel
log with qxl_mmap information messages. The following example code
illustrates this:

int main(void)
{
int fd = open("/dev/dri/card0", O_RDONLY);
if (fd == -1)
err(1, "open failed");

for (;;) {
void *m = mmap(NULL, 4096, PROT_READ,
MAP_SHARED, fd, 0);
if (m != MAP_FAILED)
munmap(m, 4096);
}
}

Stop the spamming by removing the pr_info message. Since the mmap'ing
returns -EINVAL there is no need for the pr_info message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/gpu/drm/qxl/qxl_ttm.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 7ecf8a4b9fe6..0f50c0b25a58 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -123,11 +123,8 @@ int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
struct qxl_device *qdev;
int r;

- if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
- pr_info("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
- __func__, vma->vm_pgoff);
+ if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
return -EINVAL;
- }

file_priv = filp->private_data;
qdev = file_priv->minor->dev->dev_private;
--
2.14.1
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