From da7d3fddced71f50bb1b0c431e8f77dc28eeab13 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 17 Aug 2024 09:52:46 +0300 Subject: [PATCH] dpaa2-switch: Fix error checking in dpaa2_switch_seed_bp() [ Upstream commit c50e7475961c36ec4d21d60af055b32f9436b431 ] The dpaa2_switch_add_bufs() function returns the number of bufs that it was able to add. It returns BUFS_PER_CMD (7) for complete success or a smaller number if there are not enough pages available. However, the error checking is looking at the total number of bufs instead of the number which were added on this iteration. Thus the error checking only works correctly for the first iteration through the loop and subsequent iterations are always counted as a success. Fix this by checking only the bufs added in the current iteration. Fixes: 0b1b71370458 ("staging: dpaa2-switch: handle Rx path on control interface") Signed-off-by: Dan Carpenter Reviewed-by: Simon Horman Reviewed-by: Ioana Ciornei Tested-by: Ioana Ciornei Link: https://patch.msgid.link/eec27f30-b43f-42b6-b8ee-04a6f83423b6@stanley.mountain Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index e01a246124ac..a05a8525caa4 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -2603,13 +2603,14 @@ static int dpaa2_switch_refill_bp(struct ethsw_core *ethsw) static int dpaa2_switch_seed_bp(struct ethsw_core *ethsw) { - int *count, i; + int *count, ret, i; for (i = 0; i < DPAA2_ETHSW_NUM_BUFS; i += BUFS_PER_CMD) { + ret = dpaa2_switch_add_bufs(ethsw, ethsw->bpid); count = ðsw->buf_count; - *count += dpaa2_switch_add_bufs(ethsw, ethsw->bpid); + *count += ret; - if (unlikely(*count < BUFS_PER_CMD)) + if (unlikely(ret < BUFS_PER_CMD)) return -ENOMEM; }