From: Geert Uytterhoeven Date: Mon, 31 Oct 2016 15:45:03 +0000 (+0100) Subject: swiotlb: Rate-limit printing when running out of SW-IOMMU space X-Git-Tag: v4.10-rc1~138^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0d2e18985a99bc8ff9ef260a7e10e6fcdc159f2a;p=platform%2Fkernel%2Flinux-exynos.git swiotlb: Rate-limit printing when running out of SW-IOMMU space If the system runs out of SW-IOMMU space, changes are high successive requests will fail, too, flooding the kernel log. This is true especially for streaming DMA, which is typically used repeatedly outside the driver's initialization routine. Add rate-limiting to fix this. While at it, get rid of the open-coded dev_name() handling by using the appropriate dev_err_*() variant. Signed-off-by: Geert Uytterhoeven Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 22e13a0..6ce7644 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -714,8 +714,8 @@ swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, * When the mapping is small enough return a static buffer to limit * the damage, or panic when the transfer is too big. */ - printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " - "device %s\n", size, dev ? dev_name(dev) : "?"); + dev_err_ratelimited(dev, "DMA: Out of SW-IOMMU space for %zu bytes\n", + size); if (size <= io_tlb_overflow || !do_panic) return;