FAILED: patch "[PATCH] media: cedrus: Fix endless loop in cedrus_h265_skip_bits()" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Possible dependencies:

91db7a3fc7fe ("media: cedrus: Fix endless loop in cedrus_h265_skip_bits()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 91db7a3fc7fe670cf1770a398a43bb4a1f776bf1 Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <[email protected]>
Date: Thu, 18 Aug 2022 22:33:08 +0200
Subject: [PATCH] media: cedrus: Fix endless loop in cedrus_h265_skip_bits()

The busy status bit may never de-assert if number of programmed skip bits is incorrect, resulting in a kernel hang because the bit is polled endlessly in the code. Fix it by adding timeout for the bit-polling. This problem is reproducible by setting the data_bit_offset field of the HEVC slice params to a wrong value by userspace.

index f703c585d91c..4952fc17f3e6 100644
@@ -234,8 +234,9 @@ static void cedrus_h265_skip_bits(struct cedrus_dev *dev, int num)
 		cedrus_write(dev, VE_DEC_H265_TRIGGER,
 			     VE_DEC_H265_TRIGGER_FLUSH_BITS |
 			     VE_DEC_H265_TRIGGER_TYPE_N_BITS(tmp));
-		while (cedrus_read(dev, VE_DEC_H265_STATUS) & VE_DEC_H265_STATUS_VLD_BUSY)
-			udelay(1);
+
+		if (cedrus_wait_for(dev, VE_DEC_H265_STATUS, VE_DEC_H265_STATUS_VLD_BUSY))
+			dev_err_ratelimited(dev->dev, "timed out waiting to skip bits\n");
 
 		count += tmp;
 	}