From: Dave Jiang <dave.jiang@intel.com>
Date: Sun, 24 Sep 2023 00:23:47 +0000 (-0700)
Subject: dmaengine: idxd: rate limit printk in misc interrupt thread
X-Git-Tag: v6.7-rc1~73^2~46
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=555921feb2ac03d88647ccc62015e68f157c30a2;p=thirdparty%2Fkernel%2Flinux.git

dmaengine: idxd: rate limit printk in misc interrupt thread

Add rate limit to the dev_warn() call in the misc interrupt thread. This
limits dmesg getting spammed if a descriptor submitter is spamming bad
descriptors with invalid completion records and resulting the errors being
continuously reported by the misc interrupt handling thread.

Reported-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Lijun Pan <lijun.pan@intel.com>
Link: https://lore.kernel.org/r/20230924002347.1117757-1-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---

diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index b501320a9c7ad..2183d7f9cdbdd 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -434,8 +434,8 @@ irqreturn_t idxd_misc_thread(int vec, void *data)
 		val |= IDXD_INTC_ERR;
 
 		for (i = 0; i < 4; i++)
-			dev_warn(dev, "err[%d]: %#16.16llx\n",
-				 i, idxd->sw_err.bits[i]);
+			dev_warn_ratelimited(dev, "err[%d]: %#16.16llx\n",
+					     i, idxd->sw_err.bits[i]);
 		err = true;
 	}