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Subject[PATCH] drm: qxl: ratelimit pr_info message, reduce 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);
}
}

Reduce the spamming by ratelimiting the pr_info messages.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/gpu/drm/qxl/qxl_ttm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 7ecf8a4b9fe6..6502e699f462 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -124,7 +124,7 @@ int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
int r;

if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
- pr_info("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
+ pr_info_ratelimited("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
__func__, vma->vm_pgoff);
return -EINVAL;
}
--
2.14.1
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