In preparation to limit the scope of a list iterator to the list traversal loop, use a dedicated pointer pointing to the location where the element should be inserted [1]. Before, the code implicitly used the head when no element was found when using &new->list. The new 'pos' variable is set to the list head by default and overwritten if the list exits early, marking the insertion point for list_add(). Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@xxxxxxxxxxxxxx/ [1] Signed-off-by: Jakob Koschel <jakobkoschel@xxxxxxxxx> --- drivers/net/ethernet/sfc/rx_common.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c index 1b22c7be0088..80894a35ea79 100644 --- a/drivers/net/ethernet/sfc/rx_common.c +++ b/drivers/net/ethernet/sfc/rx_common.c @@ -555,7 +555,7 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, */ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) { - struct list_head *head = &efx->rss_context.list; + struct list_head *head = *pos = &efx->rss_context.list; struct efx_rss_context *ctx, *new; u32 id = 1; /* Don't use zero, that refers to the master RSS context */ @@ -563,8 +563,10 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) /* Search for first gap in the numbering */ list_for_each_entry(ctx, head, list) { - if (ctx->user_id != id) + if (ctx->user_id != id) { + pos = &ctx->list; break; + } id++; /* Check for wrap. If this happens, we have nearly 2^32 * allocated RSS contexts, which seems unlikely. @@ -582,7 +584,7 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) /* Insert the new entry into the gap */ new->user_id = id; - list_add_tail(&new->list, &ctx->list); + list_add_tail(&new->list, pos); return new; } -- 2.25.1
