Or HaChaim on Genesis 50:14/אור החיים על בראשית נ׳:י״ד

1 וכל העולים אתו, and all those who had gone up with him, etc. The Torah tells us that not a single person who had been part of the funeral cortege failed to return to Egypt. The reason was that they had all gone only in order to perform the מצוה of burying Joseph's father. None of them returned before he had completed participating in that deed. The Torah also wants to inform us that because they were all שלוחי מצוה, charged with the performance of a good deed, none of them encountered any mishap either while going or while returning (compare Pessachim 8).

2Alternatively, the Torah may be telling us something entirely different. When the Torah speaks separately of Joseph and all those who buried his father as returning to Egypt, and then repeats the words: "after he had buried his father," it may differentiate between those who waited with their return until after the burial and between those who used the opportunity to conduct whatever business they had in Canaan by joining the funeral cortege. The former all returned safe and sound without mishap because they were engaged in a מצוה. The people who were motivated by their personal concerns were not included in the statement that everybody returned without fail.