From: Eric Dumazet Date: Fri, 10 Oct 2014 11:48:15 +0000 (-0700) Subject: igb: fix race accessing page->_count X-Git-Tag: v4.9.8~5486^2~66^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=00cd5adb0313f540aa58672d14e764d164586a43;p=platform%2Fkernel%2Flinux-rpi3.git igb: fix race accessing page->_count This is illegal to use atomic_set(&page->_count, 2) even if we 'own' the page. Other entities in the kernel need to use get_page_unless_zero() to get a reference to the page before testing page properties, so we could loose a refcount increment. Signed-off-by: Eric Dumazet Acked-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index ae59c0b..a21b144 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6545,11 +6545,10 @@ static bool igb_can_reuse_rx_page(struct igb_rx_buffer *rx_buffer, /* flip page offset to other buffer */ rx_buffer->page_offset ^= IGB_RX_BUFSZ; - /* since we are the only owner of the page and we need to - * increment it, just set the value to 2 in order to avoid - * an unnecessary locked operation + /* Even if we own the page, we are not allowed to use atomic_set() + * This would break get_page_unless_zero() users. */ - atomic_set(&page->_count, 2); + atomic_inc(&page->_count); #else /* move offset up to the next cache line */ rx_buffer->page_offset += truesize;