linux-kernel - [PATCH 6/9] staging: axis-fifo: Remove unnecessary zero-length packet check

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Message-ID: <20251227212640.3321310-6-ovidiu.panait.oss@gmail.com>
Date: Sat, 27 Dec 2025 23:26:37 +0200
From: Ovidiu Panait <ovidiu.panait.oss@...il.com>
To: gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	linux-staging@...ts.linux.dev
Subject: [PATCH 6/9] staging: axis-fifo: Remove unnecessary zero-length packet check

Remove the check for zero-length packets as this condition cannot
occur during normal operation. According to the Xilinx AXI4-Stream
FIFO Product Guide (PG080), in the Receive Length Register (RLR)
description: "The smallest packet that can be received is 1 byte."

A zero-length packet would indicate a bug in the IP core itself.

Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@...il.com>
---
 drivers/staging/axis-fifo/axis-fifo.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
index bf610e71253e..6d9ff6384168 100644
--- a/drivers/staging/axis-fifo/axis-fifo.c
+++ b/drivers/staging/axis-fifo/axis-fifo.c
@@ -193,11 +193,6 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 
 	bytes_available = ioread32(fifo->base_addr + XLLF_RLR_OFFSET);
 	words_available = bytes_available / sizeof(u32);
-	if (!bytes_available) {
-		dev_err(fifo->dt_device, "received a packet of length 0\n");
-		ret = -EIO;
-		goto end_unlock;
-	}
 
 	if (bytes_available > len) {
 		dev_err(fifo->dt_device, "user read buffer too small (available bytes=%zu user buffer bytes=%zu)\n",
-- 
2.51.0